Nestabilnost Rayleigh-Benardove konvekcije pod uticajem varijacije temperature na gornjem zidu

##plugins.themes.bootstrap3.article.main##

Sadoon Ayed

Apstrakt

Ovaj rad analizira prinudnu Rayleigh-Benard-ovu konvekciju između dva paralelna zida. Donji zid se hladi a gornji zagreva prema periodičnom prostornom rasporedu. Proces se modelira uz pomoć Navier-Stokesovih jednačina, jednačine kontinuiteta i jednačine energije. Rešenje diverencijalnih jednačina dobijeno primenom pseudo spektralnog numeričkog postupka, kod koga je Fourier-Galerkin metod upotrebljen za diskretizaciju u homogenom smeru i Chebysev kolokoacioni metod za diskretizaciju u nehomogenom smeru. Vremenska diskretizacija izvršena je uz pomoć Adams-Bashworthovog, dvo-koračnog, metoda drugog reda. Rezultati direktne numeričke simulacije predstavljeni su slikama polja vrtloga, toka i brzine za sest različita vremenska trenutka.

##plugins.themes.bootstrap3.article.details##

Kako citirati
AYED, Sadoon. Nestabilnost Rayleigh-Benardove konvekcije pod uticajem varijacije temperature na gornjem zidu. Zbornik Međunarodnog kongresa o KGH, [S.l.], v. 51, n. 1, p. 111-119, dec. 2020. Dostupno na: <https://izdanja.smeits.rs/index.php/kghk/article/view/6178>. Datum pristupa: 17 oct. 2021 doi: https://doi.org/10.24094/kghk.020.51.1.111.
Sekcija
Članci

Reference

[1] Jovanović Miloš M., Živković Dragan S., Nikodijević Jelena D., Rayleigh-Benard Convective Instability in the presence of Temperature Variation at the lower wall, University of Niš, The Faculty of Mechanical Engineer-ing, Serbia.
[2] Marcello Lappa, Thermal Convection, Patterns, Evolution and Stability, Naples, Italy, 2009.
[3] Lioyd N. Trefethen, Spectral Methods in Matlab, Oxford University, England, 2000.
[4] Seok-Ki Choi, Seong-O Kim, Computation of a turbulent Rayleigh-Benard convection with the elliptic-blending second-moment closure, Korea Atomic Energy Research Institute, Fast Breeder Reactor Devoelopment Group, 150-1 Deokjin-dong Yuseong-gu, Daejeon, 305-353, Republic of Korea, 2008.
[5] Anna Ebert, Christian Reasagk, Andre Thess, Experimental stady of temperature distribution and local heat flux for turbulent Rayleigh-Benard convection of air in a long rectangular enclosure, Ilmenau University of Tech-nolog, Department of Mechanical Engineering, Ilmenau, Germany, 2008.
[6] Bairi A., Laraqi N., J.M. Garcia de Maria, Numerical and experimental study of natural convection in tilted parallelepipedic cavities for large Rayleigh numbers, University of Paris, Department of Heat transfer, Ville d' Av-ray, France, Universidad Politechnica de Madrid, Departamento de Fisica Aplicada, Madrid, Spain, 2006.
[7] Dalila Akrour, Mouloud Tribeche and Djamel Kalache, A Theoretical and Numerical Study of Thermosolutal Convection: Stability of a Salinity Gradient Solar Pond.
[8] Nourollahi M.,Farhadi M.,Kurosh S., Numerical Study of Mixed Convection and Entropy Generation in the Poiseulle-Benard Channel in Different Angles, Babol University of Technology, Faculty of Mechanical Engeneer-ing, Babon, Islamic Republic, Iran, 2010.
[9] Suhas V. Patankar, Numerical Heat Transfer and Fluid Flow, University of Minnesota, USA, 1980.
[10] Versteeg H. K. & Malalasekera W., An introduction to computational fluid dynamics, The finite volume method, Longman Scientific & Technical, 2005.
[11] Ayed Sadoon, Gradimir Ilić, 2016. Instability of Rayleigh Benaed convection affected by lower wall tempreture variation, Facta Universitatis, Series: Mechanical Engineering 14 (2), 179-197