Search results for: NATURLA CONVECTION

• Natural convection from horizontal conic.

  Publication

  • S. Leble
  • W. Lewandowski

  - Year 2003

  Przedstawiono rozważania teoretyczne konwekcji swobodnej od powierzchni bocznej poziomego stożka.

• Natural convection in symmetrically heated vertical channels

  Publication

  • W. Lewandowski
  • M. Ryms
  • H. Denda

  - INTERNATIONAL JOURNAL OF THERMAL SCIENCES - Year 2018

  The study describes natural convection through a vertical channel, open on four sides and bound by two isothermal walls. Both balancing and infrared experimental investigations were performed in air (Pr = 0.71) to estimate the impact of channel width s and wall-to-ambient temperature difference (tw - t∞) on natural convective heat transfer, the formation of air flow patterns and the rate of flow pattern formation. The study was...

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• Natural convective heat transfer from isothermalconic

  Publication

  • W. Lewandowski
  • S. Szymański
  • P. Kubski
  • E. Klugmann-Radziemska
  • H. Bieszk
  • T. Wilczewski

  - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Year 1999

  Theoretical considerations on convective heat transfer from isothermal upward conicalsurfaces have been presented. The physical model of this phenomenon consists of an isothermalcone of inclination angle (φ) between the cone generating line (X) and the radius (R) of the cone base. The angle is a parameter of conical surface which varied from (φ = 0−circular horizontal plate) to (φ = π/2—vertical cylinder) . Onthe basis of Navier–Stokes...

• On analytical solution of stationary two dimensional boundary problem of natural convection

  Publication

  • S. Leble
  • W. Lewandowski

  - Year 2012

  Approximate analytical solution of two dimensional problem for sta- tionary Navier-Stokes, continuity and Fourier-Kirchho equations describ- ing free convective heat transfer from isothermal surface of half innite vertical plate is presented. The problem formulation is based on the typ- ical for natural convection assumptions: the uid noncompressibility and Boussinesq approximation. We also assume that orthogonal to the plate component...

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• Experimental investigations of natural convection from circular plates at variable inclination

  Publication

  • E. Klugmann-Radziemska
  • W. Lewandowski

  - JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER - Year 2007

  W pracy przedstawiono wyniki badań eksperymentalnych oraz bezwymiarową korelację liczb kryterialnych dla konwekcyjnej wymiany ciepła od izotermicznej płyty kołowej skierowanej ku górze dla różnych kątów pochylenia (od poziomej do pionowej) w szerokim zakresie wartości liczb Rayleigha. Badania przeprowadzono w wodzie dla płyty kołowej o średnicy 0,07 m. Celem pracy było określenie wpływu kąta pochylenia płyty na wartość liczby Nusselta.

• Modeling of natural convection with Smoothed Particle Hydrodynamics: Non-Boussinesq formulation

  Publication

  • K. Szewc
  • J. Pozorski
  • A. Taniere

  - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Year 2011

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• Experimental study of natural convection heat transfer from horizontal conic

  Publication

  • W. Lewandowski
  • S. Leble

  - Year 2003

  Przedstawiono badania eksperymentalne i ich wyniki konwekcji swobodnej w wodzie i powietrzu poziomych stożków o kącie przy podstawie 30, 45 i 60 deg. Wyniki badań wykazują dobrą zgodność z rozwiązaniem teoretycznym i z danymi literaturowymi.

• Natural convective heat transfer from isothermal cuboids

  Publication

  • E. Klugmann-Radziemska
  • W. Lewandowski

  - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Year 2003

  The paper presents results of theoretical and experimental investigations of the convective heat transfer from isothermal cuboid. The analytical solution was performed taking into account complete boundary layer length and the manner of its propagation around isothermal cuboid. It arises at horizontal bottom surface and grows on vertical lateral surface of the block. After changing its direction, the boundary layer occurs above...

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• Natural convective heat transfer from isothermal cuboids

  Publication

  • E. Klugmann-Radziemska
  • W. Lewandowski

  - Year 2003

  Przestawiono rozważania teoretyczne i wyniki badań eksperymentalnych konwekcyjnej wymiany ciepła od powierzchni izotermicznego prostopadłościanu. W rozwiązaniu analitycznym uwzględniono pełną długość warstwy przyściennej i sposób jej rozchodzenia się wzdłuż powierzchni prostopadłościanu. W celu zweryfikowania otrzymanego rozwiązania przeprowadzono badania eksperymentalne w trzech możliwych położeniach bryły. Zaproponowano uniwersalną...

• Numerical simulation of natural convection of Glycol-Al2O3 nanofluids from a horizontal cylinder

  Publication

  • D. Sawicka
  • A. Baars
  • J. Cieśliński
  • S. Smoleń

  - HEAT TRANSFER ENGINEERING - Year 2021

  This paper deals with natural convection around a circular cylinder with constant heat flux in a cavity using computational fluid dynamics. As fluids ethylene glycol and a mixture of ethylene glycol with Al2O3 nanoparticles (mass concentrations of nanoparticles: 0.1% and 1%) are chosen. Rayleigh number ranges from 3104 to 3105. The nanofluids are modeled with single-phase approach. For the investigated range of nanoparticle concentration, the...

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• Effect of the Geometrical Shape of a Partition on the Natural Convection of Two Fluids in a Separated Cavity

  Publication

  • A. Koulali

  - SSRN Electronic Journal - Year 2018

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• ENERGY CONVERSION AND MANAGEMENT

  Journals

  ISSN: 0196-8904 , eISSN: 1879-2227

• CFD analysis of natural convection between two superposed fluids: role of corrugated bottoms

  Publication

  • A. Sahi
  • B. Meziani
  • A. Aissa
  • D. Sadaoui
  • H. Ali
  • k. Aimad

  - CHEMICAL ENGINEERING COMMUNICATIONS - Year 2023

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• Natural convective heat-transfers from an isothermal horizontal hemispherical cavity

  Publication

  • J. M. Khubeiz
  • E. Klugmann-Radziemska
  • W. Lewandowski

  - APPLIED ENERGY - Year 2002

  Przedstawiono rozwiązanie analityczne oraz wyniki badań eksperymentalnych i numerycznych konwekcyjnej wymiany ciepła od poziomej izotermicznej kulistej wklęsłej powierzchni.

• Wystawa pt. "architektura natury | natura architektury"

  Publication

  • A. Kurkowska
  • A. Górka
  • M. E. Szarejko

  - Year 2023

  Wystawa dokumentuje ostatni etap działania, którego tematem było uczestnictwo architekta w cyklu życia natury. Twórca czerpie z przyrody inspiracje, kreuje abstrakcyjną ideę, nadaje jej materialną formę sięgając po plastyczną skałę, by ostatecznie przywrócić ją przyrodzie. Fotografie zapisały zaskakujące piękno niepozornych obiektów, które po chwili zniknęły z krajobrazu. Użyliśmy gliny wydobytej na polu w Piotrowie, gliniane byty...

• Possibility of thermal imaging use in studies of natural convection heat transfer on the example of an isothermal vertical plate

  Publication

  • W. Lewandowski
  • M. Ryms
  • H. Denda
  • E. Klugmann-Radziemska

  - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Year 2014

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• Possibility of thermal imaging use in studies of natural convection heat transfer on the example of an isothermal vertical plate.

  Publication

  • W. Lewandowski
  • M. Ryms
  • H. Denda
  • E. Klugmann-Radziemska

  - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Year 2014

  A new method of infrared (IR) camera use in convective heat transfer studies has been presented. Until now, IR cameras were utilized for temperature field visualizations of flat heated surfaces of solid objects only. Because liquids and gasses do not emit radiation in the infrared range of wave lengths, detection of temperature field in the air was conducted with the use of plastic mesh, which, after heating by hot air, emits infrared...

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• Experimental verification of natural convective heat transfer phenomenon from isothermal cuboids

  Publication

  • E. Klugmann-Radziemska
  • W. Lewandowski

  - EXPERIMENTAL THERMAL AND FLUID SCIENCE - Year 2008

  Artykuł przedstawia wyniki badań eksperymentalnych konwekcyjnej wymiany ciepła od powierzchni izotermicznego prostopadłościanu o stosunkowo dużych rozmiarach (t.j. 1.5 m x1 m x 0.5 m). Celem tych badań było otrzymanie wyników, które można by porównać z otrzymanymi dla obiektu w mniejszej skali i prezentowano we wcześniejszych doniesieniach (Int. J. Heat Mass Transfer 46 (2003) 2169-2178). Rozwiązanie eksperymentalne przeprowadzono...

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• The effect of plate size on the natural convective heat transfer intensity of horizontal surfaces

  Publication

  • E. Klugmann-Radziemska
  • W. Lewandowski

  - Year 2005

  W pracy przedstawiono badania wpływu rozmiarów płyty prostokątnej poziomej na intensywność wymiany ciepła w warunkach konwekcji swobodnej. Zaproponowano dwa zakresy: dla płyt o wymiarze charakterystycznym mniejszym niż 0,1 m - 0,2 m intensywność konwekcyjnej wymiany ciepła jest odwrotnie proporcjonalna do szerokości płyty, dla płyt szerszych niż 0,2 m szerokość płyty nie wpływa znacząco na współczynnik konwekcyjnej wymiany ciepła....

• Double-diffusive natural convection energy transfer in magnetically influenced Casson fluid flow in trapezoidal enclosure with fillets

  Publication

  • H. Shahzad
  • Q. U. Ain
  • A. A. Pasha
  • K. Irshad
  • I. A. Shah
  • A. Ghaffari
  • M. B. Hafeez
  • M. Krawczuk

  - INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER - Year 2022

  The prime motive of this disquisition is to deal with mathematical analysis of natural convection energy transport driven by combined buoyancy effects of thermal and solutal diffusion in a trapezoidal enclosure. Casson fluid rheological constitutive model depicting attributes of viscoelastic liquids is envisioned. The influence of the inclined magnetic field governed by Lorentz field law is also considered. To raise the essence...

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• Infrared techniques for natural convection investigations in channels between two vertical, parallel, isothermal and symmetrically heated plates

  Publication

  • W. Lewandowski
  • M. Ryms
  • H. Denda

  - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Year 2017

  The effect of the gap width between two symmetrically heated vertical, parallel, isothermal plates on intensity of natural convective heat transfer in a gas (Pr = 0.71) was experimentally studied using the balance and gradient methods. In the former method heat fluxes were determined based on measurements of the voltage and electric current supplying the heaters placed inside the walls. In the latter, heat fluxes were calculated...

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• Natural convective heat transfer from isothermal horizontal, vertical and inclined plates - a review

  Publication

  • E. Klugmann-Radziemska

  - Year 2009

  W artykule przedstawiono przegląd otrzymanych przez różnych badaczy korelacji eksperymentalych, teoretycznych i numerycznych, opisujących wymianę ciepła od izotermicznych płyt o różnym kącie pochylenia. Przedstawiono model matematyczny zjawiska. Opisano stosowane metody badawcze i wskazano przyczyny rozbieżności pomiędzy przedstawionymi przez wielu autorów wynikami.

• Connections

  Journals

  ISSN: 1812-1098

• Contention

  Journals

  ISSN: 2572-7184 , eISSN: 2330-1392

• CONNECTION SCIENCE

  Journals

  ISSN: 0954-0091 , eISSN: 1360-0494

• Conversion of Geraniol into Useful Value-Added Products in the Presence of Catalysts of Natural Origin: Diatomite and Alum

  Publication

  • A. Fajdek-Bieda
  • A. Wróblewska
  • P. Miądlicki
  • A. Konstanciak

  - Materials - Year 2022

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• Connection graphs

  Publication

  • P. Bartłomiejczyk

  - FUNDAMENTA MATHEMATICAE - Year 2006

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• Collection Building

  Journals

  ISSN: 0160-4953

• Coal Conversion

  Journals

  ISSN: 1004-4248

• Collection and Curation

  Journals

  ISSN: 2514-9326

• Endocrine Connections

  Journals

  ISSN: 2049-3614

• Collection Management

  Journals

  ISSN: 0146-2679 , eISSN: 1545-2549

• Simple connection matrices

  Publication

  • P. Bartłomiejczyk

  - Annales Polonici Mathematici - Year 2007

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• Galerkin finite element analysis of Darcy–Brinkman–Forchheimer natural convective flow in conical annular enclosure with discrete heat sources

  Publication

  • W. Al-Kouz
  • k. Aimad

  - Energy Reports - Year 2021

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• Biomass Conversion and Biorefinery

  Journals

  ISSN: 2190-6815 , eISSN: 2190-6823

• Magneto-thermal convection of low concentration nanofluids

  Publication

  • A. Roszko
  • E. Fornalik-Wajs
  • J. Dionizak
  • J. Wajs
  • A. Kraszewska
  • Ł. Pleskacz
  • S. Kenjeres

  - MATEC Web of Conferences - Year 2014

  The main aim of this paper was to analyze possible utilization of the low concentration nanofluids and the magnetic field to enhance heat transfer. The studied fluids were based on water with an addition of copper particles (40-60 nm diameter). They belonged to the diamagnetic group of materials. As a first attempt to stated target the analysis of enclosure placed in the maximal value of square magnetic induction gradient was carried...

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• Free Convection Heat Transfer from Horizontal Cylinders

  Publication

  • J. Cieśliński
  • S. Smoleń
  • D. Sawicka

  - ENERGIES - Year 2021

  The results of experimental investigation of free convection heat transfer in a rectangular container are presented. The ability of the commonly accepted correlation equations to reproduce present experimental data was tested as well. It was assumed that the examined geometry fulfils the requirement of no-interaction between heated cylinder and bounded surfaces. In order to check this assumption recently published correlation equations...

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• Spectral sequences and detailed connection matrices

  Publication

  • P. Bartłomiejczyk

  - Topological Methods in Nonlinear Analysis - Year 2009

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• EMC disturbances in connection of driving system

  Publication

  • S. Witkowski
  • M. Olesz

  - Year 2003

  It is known the steep voltage changes caused by IGBT frequency inverters may cause some electromagnetic problems in driving system. Special dU/dt type as well as sinusoidal filters are used in order to limit the level of the disturbances. The paper presents investigation results of EMC disturbances in inverter supplied induction motor. Experiments have proved that disturbances in current connection differ essentially. Important...

• Journal of Convention & Event Tourism

  Journals

  ISSN: 1547-0148 , eISSN: 1547-0156

• Green Sample Collection

  Publication

  • M. Marć
  • M. Śmiełowska
  • B. Zabiegała

  - Year 2017

  The term of “green sample collection” is directly associated with both passive and dynamic analytical tools which allow for simultaneous management of the stage of collection and isolation and/or enrichment of a broad spectrum of chemical compounds from environmental samples. The use of passive sampling techniques at the stage of sample collection makes it possible to obtain in a simple yet inexpensive manner an analytical information...

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• Carbon Resources Conversion

  Journals

  ISSN: 2588-9133

• Journal of the David Collection

  Journals

  ISSN: 1603-5313

• Performance of ASON/GMPLS architecture in condition of wavelength conversion and without wavelength conversion

  Publication

  • S. Kaczmarek
  • M. Młynarczuk
  • K. Szałajda

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2016

  The paper regards the problem of ASON/GMPLS performance in condition of wavelength and without wavelength conversion. The authors present influence analysis in condition of wavelength and non-wavelength conversion on the ASON/GMPLS control plane performance represented by mean Connection Set-up Time E (CST) and request loss probabilities. The offered traffic to the transport layer and request intensity have been changed for evaluation...

• Computer-aided analysis of thermal convection near electric devices

  Publication

  • S. Czapp
  • M. Czapp

  - Elektronika Ir Elektrotechnika - Year 2011

  Obciążalność długotrwała urządzeń elektrycznych zależy od intensywności oddawania ciepła przez te urządzenia do otoczenia. Dla zwiększenia obciążalności długotrwałej urządzeń stosuje się konwekcję wymuszoną np. z wykorzystaniem wentylatorów. Wszechstronne obserwacje i analiza procesów konwekcji naturalnej wskazują, że jej intensyfikację można uzyskać dzięki umieszczaniu w pobliżu urządzenia oddającego ciepło elementów tworzących...

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• On the differential effect of temperature on the Nusselt-Rayleigh relationship in free convection

  Publication

  • M. Ryms
  • G. J. Kwiatkowski
  • W. Lewandowski

  - INTERNATIONAL JOURNAL OF THERMAL SCIENCES - Year 2022

  The aim of and inspiration behind this paper was to explain the reasons, also observed by other researchers, of the discrepancy in the results of experimental free convection, which for small Rayleigh and Nusselt numbers in the initial phase of research can sometimes reach several hundred percent. These discrepancies decrease with increasing heating power and plate surface temperature, in proportion to the increase in Ra and Nu,...

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• Effect of microwave and convection heating on selected nutrients of human milk

  Publication

  • D. Martysiak-Żurowska
  • E. Malinowska-Pańczyk
  • M. Orzołek
  • B. Kusznierewicz
  • B. Kiełbratowska

  - FOOD CHEMISTRY - Year 2022

  The aim of this study was to determine the influence of the microwave heating method (MWH) on selected determinants of the nutritional value of human milk (HM) and compare to the effect exerted by the standard convection heating (CH) method, including holder pasteurization (HoP). It was showed that using MWH under conditions assumed to ensure microbiological safety, changes in the level of the nutrients were not observed. In these...

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• IEEE TRANSACTIONS ON ENERGY CONVERSION

  Journals

  ISSN: 0885-8969 , eISSN: 1558-0059

• Connection matrix theory for discrete dynamical systems

  Publication

  • P. Bartłomiejczyk
  • Z. Dzedzej

  - BANACH CENTER PUBLICATIONS - Year 1999

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• Connection matrix theory for discrete dynamical systems

  Publication

  • P. Bartłomiejczyk
  • Z. Dzedzej

  - BANACH CENTER PUBLICATIONS - Year 1999

  In [C] and [F1] the connection matrix theory for Morse decomposition is developedin the case of continuous dynamical systems. Our purpose is to study the case of discrete timedynamical systems.