Search results for: TWO-DIMENSIONAL MODELING OF FLOWS, BI-HARMONIC HELMHOLTZ EQUATION, HYDRODYNAMICS OF WATER FLOW

• Numerical solutions for blood flow in elastic vessels

  Publication

  • H. Leszczyński
  • A. Poliński
  • M. Wrzosek

  - MATHEMATICAL METHODS IN THE APPLIED SCIENCES - Year 2020

  We consider the differential–algebraic system for the blood flow and pressure in the systemic arteries. By the operator splitting method, we transform the system into the hyperbolic one, introduce the bicharacteristics, and perform the time–space nonuniform discretization, obtaining the innovative difference scheme. Our results are illustrated with numerical experiments.

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• Three-dimensional numerical investigation of hybrid nanofluids in chain microchannel under electrohydrodynamic actuator

  Publication

  • M. Amiri
  • D. Mikielewicz

  - NUMERICAL HEAT TRANSFER PART A-APPLICATIONS - Year 2023

  Energy efficiency enhancement methods have received considerable attentionwithin the industry and scientific community, owing to the rising concern ofglobal energy sustainability. The present article attempts to scrutinize the effectsof electrohydrodynamics and nanofluids on the rate of heat transfer and fluidflow in the 3-D chain microchannels. Improved heat exchangers (e.g., chainmicrochannel) would have a key role in increasing...

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• Water Behavior Near the Lipid Bilayer

  Publication

  • N. Kruszewska
  • K. Domino
  • P. Weber

  - Year 2021

  In this chapter, we focus on the dynamics of water molecules situated in the vicinity of a phospholipid bilayer. Using a molecular dynamics simulation method, we studied interactions between water and the bilayer and tracked trajectories of the water molecules. Based on the hypothesis that molecules trapped inside the bilayer make different motions than the ones which are either attached to the surface or move freely in the water...

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• Two-state dynamics for replicating two-strand systems

  Publication

  • D. Aerts
  • M. Czachor

  - OPEN SYSTEMS & INFORMATION DYNAMICS - Year 2007

  Dynamika dwustanowa została zastosowana do opisów układów dwuniciowych, analogicznych do DNA.

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• Description of the silo flow and bulk solid pulsations detection using ECT

  Publication

  • A. Romanowski
  • K. Grudzień
  • Z. Chaniecki
  • D. Sankowski
  • M. Niedostatkiewicz

  - FLOW MEASUREMENT AND INSTRUMENTATION - Year 2010

  W artykule przedstawiono wyniki zastosowania tomografii pojemnościowej do analizy pulsacji występujących w bezkohezyjnym materiale sypkim podczas opróżniania silosu cylindrycznego. Przeanalizowano wpływ parametrów zmiennych (zagęszczenia początkowego, szorstkości ściany, prędkości opróżniania) na wielkość dynamicznych pulsacji)

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• Modelowanie przepływu wód podziemnych w strefie brzegowej morza - możliwości prognozowania = Groundwater flow modeling in the coastline area - prediction possibilities

  Publication

  • B. Jaworska-Szulc

  - Year 2004

  Specyficzne warunki występowania wód podziemnych w strefie brzegowej morza sprawiają, że ich eksploatacja jest sprawą złożoną i powinna być weryfikowana na modelu numerycznym. Zasadniczym zagrożeniem jest ingresja słonych wód morskich, która może być wzbudzona eksploatacją. Innym czynnikiem, który może przyczynić się do ingresji wód słonych do warstwy wodonośnej może być podniesienie się poziomu morza. W pracy przedstawiono wyniki...

• Comparison of state feedback and PID control of pressurizer water level in nuclear power plant

  Publication

  • M. Czapliński
  • P. Sokólski
  • K. Duzinkiewicz
  • R. Piotrowski
  • T. A. Rutkowski

  - Archives of Control Sciences - Year 2013

  The pressurizer water level control system in nuclear power plant with pressurized water reactor (PWR) is responsible for coolant mass balance. The main control goal is to stabilize the water level at a reference value and to suppress the effect of time-varying disturbances (e.g. coolant leakage in primary circuit pipeline system). In the process of PWR power plant operation incorrect water level may disturb pressure control or...

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• Fully Separated Flow Control Using DBD Plasma Actuators Located at the Leading Edge of an Airfoil

  Publication

  • A. Leroy
  • P. Audier
  • D. Hong
  • J. Podliński
  • A. Berendt
  • J. Mizeraczyk

  - ERCOFTAC Bulletin - Year 2013

  In the framework of the PLASMAERO European project, experiments were conducted to investigate the authority of surface DBD plasma actuators to alter a fully separated flow around an airfoil in order to improve its aerodynamic performances in its natural stall regime. In this paper, unsteady excitation control is more specifically investigated. The key control parameter studied here is the burst frequency which periodically imposes...

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• Metrological analysis of precision of the system of delivering a water capsule for explosive production of water aerosol

  Publication

  • G. Śmigielski
  • W. Toczek
  • R. Dygdała
  • K. Stefański

  - Metrology and Measurement Systems - Year 2016

  In this paper an analysis of precision of the system controlling delivery by a helicopter of water-capsule designed for extinguishing large scale fires is presented. The analysis was performed using the numerical method of distribution propagation (Monte Carlo method) supplemented with results of application of the uncertainty propagation method. In addition the optimum conditions for the airdrop are determined to ensure achievement...

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• Experimental Research on Insufficient Water Lubrication of Marine Stern Tube Journal Bearing with Elastic Polymer Bush

  Publication

  • A. Barszczewska

  - Polish Maritime Research - Year 2020

  Water-lubricated bearings with polymer bushes are steadily gaining popularity due to their advantages, including environmental friendliness, relatively simple construction and long-term operation. Nevertheless, in practice instances of damage to such bearings occur due to insufficient or absent flow of the lubricating agent. In this study, experimental tests established that elastic polymer bush bearing is capable of operating...

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• Modelling of blood flow: from macro to microscales

  Publication

  • K. Kaczorowska-Ditrich
  • K. Tesch

  - Year 2016

  The aim of this paper it to review various scale approaches to blood flow modelling. Blood motion may be described by three types of mathematical models according to the observed scales or resolutions, namely microscopic, mesoscopic and macroscopic description. The above approaches are discussed together with their advantages and disadvantages. Several results of mesoscopic simulations are presented.

• Entrained Flow Plasma Gasification of Sewage Sludge–Proof-of-Concept and Fate of Inorganics

  Publication

  • D. Mikielewicz
  • P. Ziółkowski
  • V. Vishwajeet
  • H. Pawlak-kruczek
  • M. Baranowski
  • M. Czerep
  • A. Chorążyczkowski
  • K. Krochmalny
  • K. Ostrycharczyk
  • P. Madejski... and 5 others

  - ENERGIES - Year 2022

  Sewage sludge is a residue of wastewater processing that is biologically active and consists of water, organic matter, including dead and living pathogens, polycyclic aromatic hydrocarbons, and heavy metals, as well as organic and inorganic pollutants. Landfilling is on the decline, giving way to more environmentally friendly utilisation routes. This paper presents the results of a two-stage gasification–vitrification system, using...

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• Numerical modeling and experimental validation of full-scale segment to support design of novel GFRP footbridge

  Publication

  • J. Chróścielewski
  • T. Ferenc
  • T. Mikulski
  • M. Miśkiewicz
  • Ł. Pyrzowski

  - COMPOSITE STRUCTURES - Year 2019

  The paper contains analysis of full-scaled three meters long segment of a novel composite footbridge. Both numerical modeling and experimental validation were performed. Analyzed object is a shell type sandwich channel-like structure made of composite sandwich with GFRP laminates as a skin and PET foam as a core. Several static load schemes were performed including vertical and horizontal forces. In FEM analysis multilayered laminate...

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• A System for Cooling Electronic Elements with EHD Coolant Flow

  Publication

  • M. Tański
  • M. Kocik
  • R. Barbucha
  • K. Garasz
  • J. Mizeraczyk
  • J. Kraśniewski
  • M. Oleksy
  • A. Hapka
  • W. Janke

  - Journal of Physics : Conference Series - Year 2014

  A system for cooling electronic components where the liquid coolant flow is forced with ion-drag type EHD micropumps was tested.

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• Graphene field-effect transistor application for flow sensing

  Publication

  • M. Łuszczek
  • D. Świsulski
  • R. Hanus
  • M. Zych
  • L. Petryka

  - EPJ Web of Conferences - Year 2017

  Microflow sensors offer great potential for applications in microfluidics and lab-on-a-chip systems. However, thermal-based sensors, which are commonly used in modern flow sensing technology, are mainly made of materials with positive temperature coefficients (PTC) and suffer from a self-heating effect and slow response time. Therefore, the design of novel devices and careful selection of materials are required to improve the overall...

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• Spetiation of organic matter in Vertical Flow Constructed Wetlands

  Publication

  • A. Lang
  • H. Obarska-Pempkowiak

  - POLISH JOURNAL OF ENVIRONMENTAL STUDIES - Year 2009

  The object of the research were VFCWs which are a component of biological treatment of two hybrid hydrophyte systems located in Wieszyno and Wiklino, close to Słupsk, Poland. The facilities that are subject to analyses are unified in terms of structure (filtration material, depth of the bed and time of operation), but they differ in organic matter load, amounting respectively to: 8.0 gCOD/m2day and 31.0 gCOD/m2day.The intensity...

• Journal of Multiscale Modeling

  Journals

  ISSN: 1756-9737 , eISSN: 1756-9745

• ENVIRONMENTAL MODELING & ASSESSMENT

  Journals

  ISSN: 1420-2026 , eISSN: 1573-2967

• Journal of Mathematical Modeling

  Journals

  ISSN: 2345-394X

• Statistics & Risk Modeling

  Journals

  ISSN: 2193-1402 , eISSN: 2196-7040

• Computer Research and Modeling

  Journals

  ISSN: 2076-7633

• Computational Mathematics and Modeling

  Journals

  ISSN: 1046-283X

• Mathematical Modeling and Computing

  Journals

  ISSN: 2312-9794 , eISSN: 2415-3788

• NATURAL RESOURCE MODELING

  Journals

  ISSN: 0890-8575 , eISSN: 1939-7445

• Journal for Modeling in Ophthalmology

  Journals

  ISSN: 2468-3922 , eISSN: 2468-3930

• MODELING IDENTIFICATION AND CONTROL

  Journals

  ISSN: 0332-7353 , eISSN: 1890-1328

• Software and Systems Modeling

  Journals

  ISSN: 1619-1366 , eISSN: 1619-1374

• Scientific Modeling and Simulations

  Journals

  ISSN: 1874-8554

• Modelling of saturated, subcooled and post-dryout flow boiling with the energy dissipation based semi-empirical model

  Publication

  • D. Mikielewicz
  • J. Mikielewicz

  - Year 2019

  A comprehensive semi-empirical model for saturated, subcooled and post dryout heat transfer is presented based on considerations of energy dissipation in the flow. The fundamental hypothesis in the model is the fact that heat transfer during flow boiling can be treated as a sum of two contributions constituting the total energy dissipation in the flow, namely the energy dissipation due to the shearing flow without the bubbles and...

• Modeling pragmatics for visual modeling language evaluation

  Publication

  • A. Bobkowska

  - Year 2005

  Podczas oceny użyteczności języków modelowania wizualnego istnieje potrzeba uwzględnienia ich pragmatyki. Języki modelowania wizualnego mogą być stosowane w różnym kontekście, co powoduje różnice w wymaganiach, które są im stawiane. Jawny opis kontekstu użycia ułatwia precyzyjną ocenę. Pragmatyka składa się ze zbioru profili, które opisują konkretne konteksty użycia. W referacie podjęto próbę zastosowania modeli zadań do opisu...

• A numerical and experimental analysis of multi-hole orifice in turbulent flow

  Publication

  • A. Golijanek-Jędrzejczyk
  • A. Mrowiec
  • S. Kleszcz
  • R. Hanus
  • M. Zych
  • M. Jaszczur

  - MEASUREMENT - Year 2022

  In this research study, the comprehensive metrological analysis is investigated for a 4-hole orifice with module m = 0.25 installed in the pipeline with an internal diameter of 50 mm. A detailed numerical simulation was performed for the turbulence models: k-ε-realizable and k-ω-BSL. The novelties of the research include model validation by comparing the results of numerical studies with the experiment conducted in the area of...

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• Modeling the Effects of Slowly Biodegradable Substrate at Large WWTP in Northern Poland

  Publication

  • J. Drewnowski
  • J. Mąkinia

  - Year 2015

  The essential study was divided into two parts: experimental investigation and mathematical modeling using special platform to computer simulations. In the first part of research an innovative measurement procedure for an indirect determination of the effect of biodegradable particulate and colloidal Xs substrate was developed and implemented. The results of laboratory tests were used futher to verify the mechanism of the hydrolysis...

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• Data obtained by computation for X-ray focusing using oriented Gaussian beams

  Open Research Data

  open access

  • P. Wojda
  • S. Kshevetskii
  • G. Graff

  The propagation of X-ray waves through an optical system consisting of several X-ray refractive lenses is considered. Gaussian beams are exact solutions of the paraxial equation. The Helmholtz equation describes the propagation of a monochromatic electromagnetic wave. Since the widths of the beams are much larger than the wavelength of X-rays, Gaussian...

• Estimation of the steam condensation flow via CFD methods

  Publication

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

  - Transactions of the Institute of Fluid-Flow Machinery - Year 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...

• Irreversible thermodynamics model equations for heterogeneous solute flows in a double-membrane system

  Publication

  • A. Ślczak
  • J. Wa̧sik
  • S. Grzegorczyn
  • J. Wąsik

  - DESALINATION - Year 2004

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• Simultaneous Optimization of Unicast and Anycast Flows and Replica Location in Survivable Optical Networks

  Publication

  • K. Walkowiak
  • J. Rak

  - TELECOMMUNICATION SYSTEMS - Year 2011

  Dotychczasowe prace z zakresu ochrony sieci przed awariami dotyczyły przypadku transmisji unicast. W niniejszym artykule rozważamy problem ochrony transmisji anycast (jeden-do-jednego-z-wielu). Jako wariant ochrony stosujemy podejście pojedynczej ścieżki zabezpieczającej (ang. path protection), chroniącej przed awarią pojedynczego węzła.Wprowadzono nowe modele programowania całkowitoliczbowego optymalnego znajdowania tras oraz...

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• Methods for evaluation packet delay distribution of flows using Expedited Forwarding PHB.

  Publication

  • S. Kaczmarek
  • M. Narloch

  - Year 2004

  Artykuł dotyczy problemu zapewnienia statystycznych gwarancji jakości obsługi dla strumieni czasu rzeczywistego korzystających z Expedited Forwarding Per Hop Behavior (EF PHB) w sieci IP Differentiated Services. Statystyczne podejście do określenia gwarancji jakościowych, oparte na obliczaniu prawdopodobieństwa że opóźnienie pakietów od końca do końca jest większe niż określona wielkość, pozwala lepsze wykorzystanie sieci niż poprzednio...

• Admission control method based on effective delay for flows using EF PHB.

  Publication

  • M. Narloch
  • S. Kaczmarek

  - Year 2003

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• Admission control method based on effective delay for flows using EF PHB.

  Publication

  • M. Narloch
  • S. Kaczmarek

  - LECTURE NOTES IN COMPUTER SCIENCE - Year 2003

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• Numerical study of turbulent flow and heat transfer of nanofluids in pipes

  Publication

  • J. Cieśliński
  • H. Boertz
  • A. Baars
  • S. Smoleń

  - Year 2015

  In this work, Nusselt number and friction factor are calculated numerically for turbulent pipe flow (6 000 < Re < 12 000) with constant heat flux boundary condition using nanofluids. The nanofluid is modelled with the single-phase approach and the simulation results are compared with experimental data of Vajjha et al. [1]. Ethylene glycol and water, 60:40 EG/W mass ratio, as base fluid and SiO2 nanoparticles are used as nanofluid...

• Low-Cost Behavioral Modeling of Antennas by Dimensionality Reduction and Domain Confinement

  Publication

  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • L. Leifsson

  - Year 2023

  Behavioral modeling has been rising in importance in modern antenna design. It is primarily employed to diminish the computational cost of procedures involving massive full-wave electromagnetic (EM) simulations. Cheaper alternative offer surrogate models, yet, setting up data-driven surrogates is impeded by, among others, the curse of dimensionality. This article introduces a novel approach to reduced-cost surrogate modeling of...

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• WATER INTERNATIONAL

  Journals

  ISSN: 0250-8060 , eISSN: 1941-1707

• Water Resources

  Journals

  ISSN: 0097-8078 , eISSN: 1608-344X

• WATER POLICY

  Journals

  ISSN: 1366-7017

• WATER SA

  Journals

  ISSN: 0378-4738 , eISSN: 1816-7950

• E-Water

  Journals

  ISSN: 1994-8549

• Water and Ecology

  Journals

  ISSN: 2305-3488

• Frontiers in Water

  Journals

  eISSN: 2624-9375

• Water Security

  Journals

  eISSN: 2468-3124

• Water Cycle

  Journals

  eISSN: 2666-4453