Title of article :
Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall
Author/Authors :
a، Aswatha نويسنده , , Gowda، C. J. Gangadhara نويسنده , , Sridhara، S. N. نويسنده , , Seetharamu، K. N. نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی 12 سال 2012
Abstract :
Natural convection in cavities is studied numerically using a finite volume based computational procedure. The
enclosure used for flow and heat transfer analysis has been bounded by adiabatic top wall, constant temperature
cold vertical walls and a horizontal bottom wall. The bottom wall is subjected to uniform/sinusoidal/linearly
varying temperatures. Nusselt numbers are computed for Rayleigh numbers (Ra) ranging from 103 to 107 and
aspect ratios (H/L) 0.5 and 1. Air is taken as working fluid (Pr = 0.7). Results are presented in the form of stream
lines, isotherm plots and average Nusselt numbers. It is observed from this study that the uniform temperature at
the bottom wall gives higher Nusselt number compared to the sinusoidal and linearly varying temperature cases.
The average Nusselt number increases monotonically with Rayleigh number for both aspect ratio 1 and 0.5 for
bottom wall and side walls. For the case of aspect ratio 1, the average Nusselt number for a given Rayleigh
number increases at the bottom wall compared to aspect ratio 0.5. However, the average Nusselt number increases
as the aspect ratio decreases from 1 to 0.5 for side wall except for uniform temperature case.
Journal title :
Journal of Applied Fluid Mechanics (JAFM)
Journal title :
Journal of Applied Fluid Mechanics (JAFM)