TY - JOUR
TI - Effect of discrete heater at the vertical wall of the cavity over the heat transfer and entropy generation using LBM
AU - Delavar Mojtaba Aghajani
AU - Farhadi Mousa
AU - Sedighi Kurosh
JN - Thermal Science
PY - 2011
VL - 15
IS - 2
SP - 423
EP - 435
PT - Article
AB - In this paper Lattice Boltzmann Method (LBM) was employed for investigation  the effect of the heater location on flow pattern, heat transfer and entropy  generation in a cavity. A 2D thermal lattice Boltzmann model with 9  velocities, D2Q9, is used to solve the thermal flow problem. The simulations  were performed for Rayleigh numbers from 103 to 106 at Pr = 0.71. The study  was carried out for heater length of 0.4 side wall length which is located at  the right side wall. Results are presented in the form of streamlines,  temperature contours, Nusselt number and entropy generation curves. Results  show that the location of heater has a great effect on the flow pattern and  temperature fields in the enclosure and subsequently on entropy generation.  The dimensionless entropy generation decreases at high Rayleigh number for  all heater positions. The ratio of averaged Nusselt number and dimensionless  entropy generation for heater located on vertical and horizontal walls was  calculated. Results show that higher heat transfer was observed from the cold  walls when the heater located on vertical wall. On the other hand, heat  transfer increases from the heater surface when it located on the horizontal  wall.