Wyniki wyszukiwania dla: FLUID FLOW MEASUREMENT

• THE THERMODYNAMIC ANALYSIS OF THE SZEWALSKI HIERARCHIC VAPOUR CYCLE COOPERATED WITH THE SYSTEM OF HEAT RECOVERY

  Publikacja

  • P. Ziółkowski
  • T. Kowalczyk
  • J. Hernet
  • S. Kornet

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2015

  In this paper, thermodynamic analysis of the Szewalski hierarchic vapour cycle cooperated with the system of heat recovery from exhaust gases are presented. According to that purpose, the CFM (Computation Flow Mechanics [1,3]) approach has correctly been used. The whole system consists of the first traditional steam cycle, the second organic Rankine cycle (ORC) and system of heat recovery with use of water with temperature 90...

• Minimum drag shape bodies moving in inviscid fluid - revisited

  Publikacja

  • K. Tesch
  • K. Kaczorowska-Ditrich

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2017

  This paper presents the classic approach to minimum drag shape body problem, moving at hypersonic speeds, leading to famous power law shapes with value of the exponent of 3/4. Two- and three-dimensional cases are considered. Furthermore, an exact pseudo solution is given and its uselessness is discussed. Two new solutions are introduced, namely an approximate solution due to form of the functional and solution by means of optimisation...

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• Estimation of the steam condensation flow via CFD methods

  Publikacja

  • W. Zakrzewski
  • M. Karcz
  • S. Kornet

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2012

  The results of numerical simulations to predict the performance of different steam models have been presented. All of the considered models of steam condensation have been validated on the base of benchmark experiment employing expansion in nozzle and next on the low pressure part of the steam turbine stage. For numerical analysis three models have been finally used – the ideal steam model without condensation, an equilibrium steam...

• Investigation of R 22 and R 134a flow boiling in enhanced tubes

  Publikacja

  • J. Cieśliński
  • W. Targański

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2003

  Przedstawiono wyniki pomiarów współczynnika przejmowania ciepła i spadków ciśnienia podczas wrzenia w przepływie R22 oraz R134a. Do badań użyto dwie rurki o rozwiniętej wewnętrznej powierzchni, tj. rurkę śrubowo-formowaną i rurkę niskożebrowaną oraz dwie rurki gładkie, jako rurki referencyjne. Eksperymenty przeprowadzono przy temperaturze nasycenia ok. zero stopni Celsjusza i końcowym stopniu suchości ok. 0.7. Wyniki badań eksperymentalnych...

• On Application of Selected Methods of Artificial Intelligence in Expert Systems for Thermal and Flow Diagnostics

  Publikacja

  • J. Głuch

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2003

  Przedyskutowano problem wspomagania przez systemy ekspertowe decyzji eksploatacyjnych służb nadzoru obiegów turbin parowych. Uwagę skupiono na realizacji jednego z zadań tych systemów, polegającemu na określenie rozmiaru eksploatacyjnej degradacji parametrów geometrycznych układów łopatkowych turbin. Dyskusję przeprowadzono na przykładzie jednego z komponentów metod sztucznej inteligencji: wybranego typu sztucznej sieci neuronowej...

• Influence of gas parameters alteration on the form of gas-flow-impact appearing in long transportation pipelines

  Publikacja

  • W. Próchnicki
  • M. Dzida

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2003

  Przy szybkich zamknięciach przepływu w długich liniach transportowych gazu, obserwuje się znaczne przesterowania ciśnienia, towarzyszące zjawiskom udarowym, wywołane zarówno falą uderzeniową jak i odbitą. Głównym czynnikiem wpływającym na postać fali uderzeniowej i jej amplitudy, jest szybkość zamykania zaworu odcinającego określona stałą czasową serwomotoru sterującego zaworem. Ponieważ obserwuje się zmiany właściwości chemicznych...

• On the internal efficiency of a turbine stage: classical and CFD definitions

  Publikacja

  • L. Nastałek
  • M. Karcz
  • D. Sławiński
  • W. Zakrzewski
  • P. Ziółkowski
  • C. Szyrejko
  • J. Topolski
  • J. Badur
  • R. Werner

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2012

  Almost entire fleet of steam turbines in Poland was designed between 1950 – 1980 with the use of the so-called zero dimensional (0D) calculation tools. For several years, design and modernization of the turbines occur in assistance with the state of the art methods that describe working fluid flow field based on 3D models and CFD codes. This cooperation between 0D and 3D codes requires exchange of overall, integral information...

• How much a geometrical model of a honeycomb seal can be simpli ed in the CFD calculation

  Publikacja

  • M. Stajnke
  • W. Włodarski

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2017

  This paper presents the inuence of geometry simplication on the results obtained in the computational fluid dynamics simulation. The subject of simulation was part of the honeycomb seal located at the inlet to high pressure part of a steam turbine. There were three different geometrical models assumed in the calculations. First one was two-dimensional case and two others were three dimensional, one with the radius of curvature...

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• A role of the heat and work uncompensatedtransformations in the balance of entropy and theturbomachinery efficiency

  Publikacja

  • T. Kowalczyk
  • P. Ziółkowski
  • D. Sławiński
  • J. Badur
  • M. Cisak

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2017

  In the paper we have presented a procedure of estimating a role of the uncompensated transformation of heat and work in ow of viscous and heat conducting uid. The procedure was introduced by Professor Romuald Puzyrewski and is essential in local, in time and space, balance of entropy. Furthermore this unique approach leads to redenition the eciency of uid-ow machinery in three-dimensional modeling using CFD (Computational Fluid...

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• An advanced thermal-FSI approach of an evaporation of air heat pump

  Publikacja

  • F. Judyta
  • Z. Paweł
  • B. Janusz

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2015

  The paper presents selected problems of numerical modeling of an advanced thermal-FSI approach of evaporator of air heat pomp. The example of a fin-tube evaporator has been studied, focusing on obtaining of heat exchanger characteristics applying two-phase flow model for the in-tube refrigerant flow. Special attention is given to heat transfer between separated medium for different air velocity and changed refrigerant mass flow...

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• STUDY ON THE EFFECTIVENESS OF THE TURBINE CONDENSER AIR EXTRACTION SYSTEM USING HYDRO EJECTORS

  Publikacja

  • J. Badur
  • T. Kowalczyk
  • P. Ziółkowski
  • T. Piotr
  • W. Mariusz

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2016

  The aim of the paper is to investigate the effectiveness of the 18K380 steam turbine condenser air extraction system using hydro ejectors. Motivation for the analysis is a need of improvement of the energy conversion ratio of the power plant. To achieve this goal it is necessary to establish efficiency of each subsystem of the energy cycle. The air extraction system is not a highly power consuming system but it has great impact...

• ENHANCED EVAPORATION OF THE DROPLETS OF CONDENSATE IN THE ASYMMETRICAL SHOCK WAVE ZONE

  Publikacja

  • S. Kornet
  • J. Badur

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2015

  In the low-pressure part of steam turbine, the state path usually crosses the saturation line in penultimate stages [4,5]. The formation and evolution of these droplets lower the performance of the wet stages of the turbines, and their effects on the efficiency are collectively known as wetness losses [4]. Nowadays, due to work of steam turbines at partial load, process of homogeneous and heterogeneous condensation still is current....

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• INFLUENCE OF SURFACE CURVATURE ON SESSILE DROPLET CONTACT ANGLE OF NANOFLUIDS

  Publikacja

  • J. Cieśliński
  • K. Ronewicz

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2013

  This paper deals with change in contact angle of droplets of three nanofluids, i.e. water-Al2O3, water-TiO2 and water-Cu. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. Although dispersants were not used to stabilize the suspension, the solutions tested exhibited satisfactory stability. Ultrasonic vibration was used in order to stabilise the dispersion of the nanoparticles. Experimental measurements...

• Clean gas technologies - towards zero-emission repowering of Pomerania.

  Publikacja

  • P. Ziółkowski
  • J. Badur

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2013

  The main aim this work is to show the different thermodynamic cycles which improve efficiency and/or decrease emission like: Cheng cycle, Szewalski cycle, LOTHECO cycle, hybrid pSOFC/GT cycle, inverse Brayton cycle, low-emission cycle and zero-emission cycle. For that purpose, cycles and results of analysis are first studied and, secondly, new concept is presented. The role of coupled analysis 0D and 3D in cycle’s devices is also...

• Design and distribution of air nozzles in the biomass boiler assembly

  Publikacja

  • K. Ronewicz
  • T. Turzyński
  • D. Kardaś

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2013

  Due to energy crisis as well as increasing pollution of the environment, renewable energy sources usage increases all over the world. These facts encouraged authors to start research over developing a uniform biomass boiler calculation model. This paper presents a design of biomass boiler assembly created for ORC (Organic Rankine Cycle) unit since these systems could achieve strong position in energy industry....

• Enhancement of the Brayton cycle efficiency by water or steam utilization

  Publikacja

  • K. Jesionek
  • A. Chrzczonowski
  • P. Ziółkowski
  • J. Badur

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2013

  In the paper, thermodynamic analysis of two modifications of a Brayton cycle into enhancement cycles with water/steam injection are discussed. The first one deals with a STIG modified system with both interstage compressed air cooling and air heating (heat regeneration) before combustion chamber. The second one, mainly devoted to higher steam/air ratio, is connected with separate steam production in a HRSG. The analysis has been...

• Motion of a sphere in vicinity of the wall

  Publikacja

  • D. Mikielewicz
  • J. Wajs

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2006

  Artykuł skupiony jest na badanich odchylenia toru cząstki w sąsiedztwie ścianki. Cząstka modelowana jest nieodkształcalną kulą zawieszoną na strunie. Systematyczne badania z wykorzystaniem kul o trzech średnicach wykonano na specjalnie zbudowanym stanowisku eksperymentalnym. Zaproponowano autorską matematyczną korelację opisującą oddziaływanie ścianki na ruch cząstki - korelacja określa to oddziaływanie w funkcji początkowej odległości...

• Experimental investigations of hydraulic jump created by a two-phase impin-ging jet on a solid surface

  Publikacja

  • S. Gumkowski

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2003

  Przedstawiono rezultaty badań eksperymentalnych powstawania uskoku hydraulicznego tworzonego przez dwufazową strugę uderzającą.

• Theoretical investigations into flows in rotor blade shroud clearance

  Publikacja

  • K. Kosowski
  • R. Stępień

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2003

  Przedstawiono wyniki obliczeń programem Fluent przepływów w uszczelnieniu nadbandażowym stopnia turbinowego przy różnym mimośrodowym położeniu osi wirnika względem osi korpusu. Wyznaczone numerycznie rozkłady ciśnienia w uszczelnieniu i generowane tam siły aerodynamiczne porównano z rezultatem badań przeprowadzonych na powietrznej turbinie modelowej.

• Analysis of transient heat transfer operation in tube wall.Selected papers from the International Conference on Turbines of Large Output devoted to 100th Anniversary of Prof. Robert Szewalski Birthday.

  Publikacja

  • L. Kołakowski
  • P. Krzyślak

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2003

  W pracy przedstawiono zachowanie się wymiennika ciepła stosowanego w układzie regeneracji turbin parowych w niestacjonarnych warunkach pracy.

• An impact of ambient parameters change on steam and gas turboset control. The International Conference on ''Turbines of Large Output'' devoted to 100th Anniversary of prof. Robert Szewalski Birthday.

  Publikacja

  • Z. Domachowski

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2003

  Porównano wpływ zmian parametrów otoczenia (ciśnienia i temperatury) na charakterystyki turbiny parowej i gazowej. Na tej podstawie zbadano wpływ tych parametrów na charakterystyki układu kombinowanego parowo-gazowego. Przedstawiono, w związku z tym, koncepcję kompensatora wpływu zmian parametrów otoczenia na charakterystyki układu kombinowanego parowo-gazowego.

• Volute scroll as an alternative to guide vanes at inlet to turbine.

  Publikacja

  • R. Puzyrewski
  • R. Biernacki

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2003

  W pracy przedstawiono alternatywny sposób zasilania turbin parowych poprzez zastosowanie podwójnej spirali zasilającej. Przedstawiono model jednowymiarowy obliczania przepływu przez spirale oraz zamieszczono wyniki obliczeń typu 3D. Pokazano jak zależy parametr nierównomierności rozkładu prędkości na wylocie od sposobu kształtowania przekroju spiral.

• Kinetic analysis of the stage for a high speed steam turbine

  Publikacja

  • D. Sławiński
  • W. Zakrzewski

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2012

  This article analyzes possibilites of resonances within a control stage for a high speed steam turbine. This stage hase been based on assembling of a single blade to a rotating disk and increasing of rigidity of the system by using of a bandage. In the analysis will be nd a possiblity of resonance frequency, and mistuning by showing safety working ranges. The calculations have bean used the3D modal and harmonic analysis by the...

• Experimental and theoretical study of surface cooling using a single microjet

  Publikacja

  • D. Mikielewicz
  • T. Muszyński

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2010

  Przedstawiono wyniki badań eksperymentalnych intensyfikacji wymiany ciepła przy pomocy pojedynczych strug wody i powietrza.Uzyskana na podstawie wyników korelacja, opisująca współczynnik przejmowania ciepła, posłużyła do weryfikacji modelu opracowanego wcześniej przez Mikielewicza (2007).

• HIERARCHICAL CYCLES IN MODERN POWER SYSTEMS – EXERGY ANALYSIS UNDER PART LOADS

  Publikacja

  • T. Kowalczyk
  • P. Ziółkowski
  • S. Kornet

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2015

  The aim of the paper is to investigate thermodynamic efficiency of advanced hierarchic power cyclesunder partial loads by using of exergy analyze. Advanced hierarchical power systems arecomposed of few energy conversion cycles, most common are steam and gas cycles in various configurations, but they may contain fuel cells, ORC, lithium bromide absorption chillers and others. Moreover hierarchical cycles can be powered by several...

• Design criterion for hydrodynamic vortex separators

  Publikacja

  • M. Gronowska-Szneler
  • J. Sawicki

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2017

  Technical objects designing involves determination of geometrical parameters that characterize a given object. When the device is described by the differential equations, an inverse problem brings difficulties, as geometrical values sought condition the solution to the problem. Vortex separators can be designed by the "criterion method'. Firstly, a critical particle is distinguished such that bigger particles are removed from...

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• DEVELOPMENT OF A COUPLED NUMERICAL AND EXPERIMENTAL APPROACH TO HYDRODYNAMIC NOISE ESTIMATION

  Publikacja

  • J. Felicjancik
  • M. Gatz
  • J. Badur

  - Transactions of the Institute of Fluid-Flow Machinery - Rok 2017

  The hydroacoustic signature of ships' propellers can be estimated experimentally through measurements of cavitation-induced pressure fluctuations and the corresponding noise distributions at model scale. These measurements need to be performed in a cavitation tunnel under the propellers operating conditions and are quite sensitive and challenging to perform with sufficient accuracy. In comparison, the numerical approach can be...

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• Numerical investigation of multiphase blood flow coupled with lumped parameter model of outflow

  Publikacja

  • B. Melka
  • W. Adamczyk
  • M. Rojczyk
  • M. L. Nowak
  • M. Gracka
  • A. J. Nowak
  • A. Golda
  • R. Białecki
  • Z. Ostrowski

  - INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW - Rok 2019

  Purpose The purpose of this paper is the application of the computational fluid dynamics model simulating the blood flow within the aorta of an eight-year-old patient with Coarctation of Aorta. Design/methodology/approach The numerical model, based on commercial code ANSYS Fluent, was built using the multifluid Euler–Euler approach with the interaction between the phases described by the kinetic theory of granular flow (KTGF). Findings A...

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• A new model of fuel spray shape at early stage of injection in a marine Diesel engine

  Publikacja

  • J. Grochowalska
  • P. Jaworski
  • Ł. J. Kapusta
  • J. Kowalski

  - INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW - Rok 2022

  In the cylinders of a marine diesel engine, self-ignition occurs in very shortly time after the fuel injection into the combustion chamber. Therefore, the paper present was to develop a model of diesel fuel spray for the early stage of fuel spray for in marine diesel engine. There were taken into consideration the main aspects technical such as nozzle diameter of marine engine injector and backpressure in combustion chamber. In...

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• Prototype of an opto-capacitive probe for non-invasive sensing cerebrospinal fluid circulation

  Publikacja

  • T. Myllylä
  • E. Vihriälä
  • M. Pedone
  • V. Korhonen
  • Ł. Surażyński
  • M. Wróbel
  • A. Zienkiewicz
  • J. Hakala
  • H. Sorvoja
  • J. Lauri... i 4 innych

  - Rok 2017

  In brain studies, the function of the cerebrospinal fluid (CSF) awakes growing interest, particularly related to studies of the glymphatic system in the brain, which is connected with the complex system of lymphatic vessels responsible for cleaning the tissues. The CSF is a clear, colourless liquid including water (H2O) approximately with a concentration of 99 %. In addition, it contains electrolytes, amino acids, glucose, and...

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• A Computational Analysis of the Aerodynamic and Aeromechanical Behavior of a Thermo-Well for Steam Temperature Measurement in a Steam Turbine

  Publikacja

  • M. Banaszkiewicz
  • J. Badur
  • S. Kornet
  • D. Sławiński
  • B. Kraszewski
  • P. Ziółkowski
  • A. Rehmus-Forc
  • G. Bzymek

  - HEAT TRANSFER ENGINEERING - Rok 2023

  The goal of the paper is twofold: firstly, it presents computational fluid dynamics analysis for finding maximum unsteady flow forces (and their frequencies) acting on a thermo-well for measuring steam temperature in a steam turbine control stage and secondly, it presents computational solid dynamics analysis of possibility of entry into resonance of the thermowell structure. There have been analyzed two cases of flow with changing...

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• Dynamic state assessment of the water turbine with the power of 600 kW

  Publikacja

  • G. Żywica
  • P. Bagiński
  • Ł. Breńkacz

  - Diagnostyka - Rok 2013

  The article discusses the results of experimental studies to assess the dynamic state of the turbine set with the Kaplan turbine. The dynamic assessment was made on the basis of appropriate standards, based on the measurement results of selected parameters of vibration, which have been measured for several states of the machine load. In addition, we attempted to identify the causes of the increased vibration levels based on the...

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• Effects of consecutive apneas on pial artery pulsation and subarachnoid width in healthy subjects

  Publikacja

  • M. Wszędybył-Winklewska
  • J. Wolf
  • E. Świerblewska
  • K. Kunicka
  • M. Gruszecki
  • W. Gumiński
  • P. J. Winklewski
  • A. F. Frydrychowski
  • L. Bieniaszewski
  • K. Narkiewicz

  - JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY - Rok 2014

  Hypercapnia is known to dilate the pial artery, disrupt cerebral autoregulation and increase pial artery pulsation. The cerebral blood flow velocity (CBFV) response to hypercapnia is biphasic. Below the threshold for the increase of blood pressure (BP) with carbon dioxide partial pressure (pCO2), the CBFV measurement reflects vascular reactivity to pCO2 alone at a constant BP. Above this threshold, the CBFV measurement provides...

• A comparative performance assessment of a hydrodynamic journal bearing lubricated with oil and magnetorheological fluid

  Publikacja

  • F. Quinci
  • W. Litwin
  • M. Wodtke
  • R. van den Nieuwendijk

  - TRIBOLOGY INTERNATIONAL - Rok 2021

  This work presents the investigation results of a journal bearing lubricated with magnetorheological fluid that is activated by a local constant magnetic field to vary both the local flow resistance and pressure. The bearing performance is assessed via Finite Element Modelling (FEM) and results are corroborated by experiments. The FEM model uses the Bingham model to describe the fluid film. A dedicated test rig is used to assess...

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• Design and computational fluid dynamics analysis of the last stage of innovative gas-steam turbine

  Publikacja

  • S. Głuch
  • P. Ziółkowski
  • Ł. Witanowski
  • J. Badur

  - Archives of Thermodynamics - Rok 2021

  Research regarding blade design and analysis of flow has been attracting interest for over a century. Meanwhile new concepts and design approaches were created and improved. Advancements in information technologies allowed to introduce computational fluid dynamics and computational flow mechanics. Currently a combination of mentioned methods is used for the design of turbine blades. These methods enabled us to improve flow efficiency...

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• Accuracy Investigations of Turbine Blading Neural Models Applied to Thermal and Flow Diagnostics

  Publikacja

  • A. Butterweck
  • J. Głuch

  - Rok 2016

  Possibility of replacing computional fluid dynamics simulations by a neural model for fluid flow and thermal diagnostics of steam turbines is investigated. Results of calculations of velocity magnitude of steam for 3D model of the stator of steam turbine is presented.

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• Nutrient transport and acquisition by diatom chains in a moving fluid

  Publikacja

  • M. M. Musielak
  • L. Karp-Boss
  • P. Jumars
  • L. Fauci

  - JOURNAL OF FLUID MECHANICS - Rok 2009

  The role of fluid motion in delivery of nutrients to phytoplankton cells is a fundamental question in biological and chemical oceanography. In the study of mass transfer to phytoplankton, diatoms are of particular interest. They are non-motile, are often the most abundant components in aggregates and often form chains, so they are the ones expected to benefit most from enhancement of nutrient flux due to dissipating turbulence....

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• Experiments and Analysis of the Limit Stresses of a Magnetorheological Fluid

  Publikacja

  • W. Horak
  • B. Stępień
  • B. Sapiński

  - Acta Mechanica et Automatica - Rok 2022

  Paper presents the results of a rheological test of a commercial magnetorheological (MR) fluid (MRF-132DG). The researchincludes the problem of measuring and interpreting limit stresses under conditions close to the magnetic saturation of the fluid. Fourdifferent limit stresses were determined, two related to the yield point and two related to the flow point. Methods for determining limitstresses, especially due to excitation...

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• Effects of subfilter velocity modelling on dispersed phase in LES of heated channel flow

  Publikacja

  • J. Pozorski
  • M. Knorps
  • M. Łuniewski

  - Journal of Physics : Conference Series - Rok 2011

  A non-isothermal turbulent flow with the dispersed phase is modelled using the Large Eddy Simulation (LES) approach for fluid, one-way coupled with the equations of point-particle evolution. The channel is heated at both walls and isoflux boundary conditions are applied for fluid. Particle velocity and thermal statistics are computed. Of particular interest are the r.m.s. profiles and the probability density function of particle...

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• Criteria for selection of working fluid in low-temperature ORC

  Publikacja

  • D. Mikielewicz
  • J. Mikielewicz

  - Chemical and Process Engineering : New Frontiers - Rok 2016

  The economics of an ORC system is strictly linked to thermodynamic properties of the working fluid. A bad choice of working fluid could lead to a less efficient and expensive plant/generation unit. Some selection criteria have been put forward by various authors, incorporating thermodynamic properties, provided in literature but these do not have a general character. In the paper a simple analysis has been carried out which resulted...

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• Study of Slip Effects in Reverse Roll Coating Process Using Non-Isothermal Couple Stress Fluid

  Publikacja

  • H. Shahzad
  • X. Wang
  • M. B. Hafeez
  • Z. Shah
  • M. A. Alsheri

  - Coatings - Rok 2021

  The non-isothermal couple stress fluid inside a reverse roll coating geometry is considered. The slip condition is considered at the surfaces of the rolls. To develop the flow equations, the mathematical modelling is performed using conservation of momentum, mass, and energy. The LAT (lubrication approximation theory) is employed to simplify the equations. The closed form solution for velocity, temperature, and pressure gradient...

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• Modeling lubricant flow between thrust-bearing pads

  Publikacja

  • G. Rotta
  • M. Wasilczuk

  - TRIBOLOGY INTERNATIONAL - Rok 2008

  Inlet temperature is one of the main inputs in all models for the analysis of fluid film bearing performance. At the same time, inlettemperature distribution and also oil velocity distribution at the inlet are the result of flow phenomena in the gap between the bearingpads. These phenomena are complex and in many cases further affected by any special arrangements of forced oil supply to the gapbetween pads. The reason for such...

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• Neural network simulator's application to reference performance determination of turbine blading in the heat-flow diagnostics.

  Publikacja

  • A. Butterweck
  • J. Głuch

  - Rok 2013

  In the paper, the possibility of application of artificial neural networks to perform the fluid flow calculations through both damaged and undamaged turbine blading was investigated. Preliminary results are presented and show the potentiality of further development of the method for the purpose of heat-flow diagnostics.

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• Steady magnetohydrodynamic flow in a diverging channel with suction or blowing

  Publikacja

  • G. Layek
  • S. Kryzhevich
  • S. A. Gupta
  • M. Reza

  - ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK - Rok 2013

  An analysis is made of steady two-dimensional divergent flow of an electrically conducting incompressible viscous fluid in a channel formed by two non-parallel walls, the flow being caused by a source of fluid volume at the intersection of the walls. The fluid is permeated by a magnetic field produced by an electric current along the line of intersection of the channel walls. The walls are porous and subjected to either suction...

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• Analysis of the radiation dose in UV-disinfection flow reactors.

  Publikacja

  • W. Artichowicz
  • A. Łuczkiewicz
  • J. Sawicki

  - Water - Rok 2020

  Theoretical considerations devoted to the variation of UV radiation doses in flow disinfection reactors are presented. The minimal time required by the fluid to pass the reactor was determined and combined with the radiation intensity. The active zones of the reactor were determined.

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• Free-surface elevation in open vortex flow controls

  Publikacja

  • M. Szymon
  • J. Sawicki

  - Water Science - Rok 2016

  Rotational form of fluid motion is complex, but very important in science and technology. The paper is devoted to the hydraulic mechanism of flow in open vortex flow controls, or regulators. The velocity field was described by the kinematic model, and intensity of rotation - by means of the energy balance between the input and dissipation. In consequence some algebraic expresions were obtained, which can be useful in approximated...

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• Experimental investigations on condensation in flow of HFE-7100 in small diameter channels

  Publikacja

  • D. Mikielewicz
  • R. Andrzejczyk
  • M. Klugmann
  • J. Wajs

  - Rok 2012

  In the paper the authors present investigations of flow condensation with the use of the HFE-7100 as a working fluid. The original and new approach to removing the heat from the channel was applied. The research was carried out using a wide-range real time observations, e.g. using infrared camera and stroboscope microphotography. This paper presents the details of experiment as well as the influence of heat and flow parameters...

• Influence of Properties of Hydraulic Fluid on Pressure Peaks in Axial Piston Pumps’ Chambers

  Publikacja

  • P. Patrosz

  - ENERGIES - Rok 2021

  The article concentrates on the research of the pressure peaks in a working chamber of an axial piston pump. The main focus of the article is the influence of fluid properties on the pressure peaks value. Experimental and analytical methods were used to determine the impact of the fluid density, viscosity, compressibility and aeration. The article describes the pressure peak generation process and explains the theoretical basis...

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• Application of the fluid–structure interaction technique for the analysis of hydrodynamic lubrication problems.

  Publikacja

  • M. Wasilczuk
  • M. Wodtke
  • A. Olszewski

  - PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY - Rok 2013

  Fluid–structure interaction technique seems to be one of the most promising possibilities for theoretical analysis of lubrication problems. It allows coupling of different physical fields in one computational task, taking into account the interaction between them. In this article, two sets of fluid–structure interaction analyses focusing on the bearing performance evaluation are presented. One analysis was applied to a water-lubricated...

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• Experimental investigations on pressure drop during the condensation in flow of HFE7000 in vertical minichannel

  Publikacja

  • D. Mikielewicz
  • M. Klugmann
  • R. Andrzejczyk
  • J. Wajs

  - Rok 2014

  In the work presented in the paper authors focused attention on the issues of flow resistance and pressure drop during condensation in the flow. The case of the descending flow through a cylindrical single-channel of 2.3 mm inner diameter was carefully analyzed. In the course of investigations a new working fluid HFE 7000 has been scrutinised which has a strongly differing properties in comparison to the other fluids that are commonly...