TY - JOUR
ID - 991
TI - Natural Convection and Entropy Generation in Γ-Shaped Enclosure Using Lattice Boltzmann Method
JO - Challenges in Nano and Micro Scale Science and Technology
JA - CNMST
LA - en
SN - 2322-3634
AU - Fattahi, E.
AU - Farhadi, M.
AU - Sedighi, K.
AD - Faculty of Mechanical Engineering, Babol University of Technology Babol, Iran
Y1 - 2013
PY - 2013
VL - 1
IS - 1
SP - 1
EP - 18
KW - Entropy generation
KW - Lattice Boltzmann Method
KW - natural convection
KW - Γ-Shaped enclosure
DO - 10.7508/tpnms.2013.01.001
N2 - This work presents a numerical analysis of entropy generation in Γ-Shaped enclosure that was submitted to the natural convection process using a simple thermal lattice Boltzmann method (TLBM) with the Boussinesq approximation. A 2D thermal lattice Boltzmann method with 9 velocities, D2Q9, is used to solve the thermal flow problem. The simulations are performed at a constant Prandtl number (Pr = 0.71) and Rayleigh numbers ranging from 103 to 106 at the macroscopic scale (Kn = 10-4). In every case, an appropriate value of the characteristic velocity is chosen using a simple model based on the kinetic theory. By considering the obtained dimensionless velocity and temperature values, the distributions of entropy generation due to heat transfer and fluid friction are determined. It is found that for an enclosure with high value of Rayleigh number (i.e., Ra=105), the total entropy generation due to fluid friction and total Nu number increases with decreasing the aspect ratio.
UR - https://chal.usb.ac.ir/article_991.html
L1 - https://chal.usb.ac.ir/article_991_ed33fb88310481a59b7edd67542621f9.pdf
ER -