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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v40.i6.20
pages 521-536

Effect of the Heater Location on Heat Transfer and Entropy Generation in the Cavity Using the Lattice Boltzmann Method

Mojtaba Aghajani Delavar
Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran
Mousa Farhadi
Faculty of Mechanical Engineering, Noshirvani University of Technology, Babol, Islamic Republic of Iran
Kurosh Sedighi
Babol University of Technology, Faculty of Mechanical Engineering, Babol, Iran

RÉSUMÉ

In this study, a lattice Boltzmann method (LBM) was employed to numerically investigate the effect of the heater location on entropy generation, flow pattern, and heat transfer in a cavity. The study was carried out for a heater of length 0.4H which is located at the lower wall of the cavity. The simulations were performed for Rayleigh numbers from 103 to 106 at Pr = 0.71. The results show that the location of the heater has a great effect on the flow pattern and temperature fields in the enclosure and subsequently on entropy generation. With increasing the distance between the heater and a cold wall the entropy generation decreases. On the other hand, a maximum Nusselt number is observed over the left cold wall when the heater is located near the cold wall. The slope variation (gradient) of the Nusselt number increases over the heater and the left wall of the cavity at a higher Rayleigh number for a fixed location of the heater. The dimensionless entropy generation decreases at a high Rayleigh number and is independent of the heater position.


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