Mixed convection of heat and mass transfer in an isosceles trapezoidal
cavity has been studied numerically. Constant
heat flux is imposed through four outlets and the grid is insulated. The
inclined walls are maintained in natural convection while the lower horizontal
wall is adiabatic. These conditions reflect the air draft zone of the ASUTO
charcoal stove. The governing two-di- mensional
flow equations have been solved by using the finite difference method and
Thomas’s algorithm. The investigations are conducted
for different values of Richardson (Ri), Reynolds number (Re)
and inclination angles of sidewalls. The results are presented in terms of
streamlines, isotherms, moisture contours. It was found that for Reynolds
number (Re) equal to 100, the flow pattern is strongly
dependent on the inclination angle and Richardson number. Thus, for high
Richardson number (Ri)
values (10, 100), the dominance of natural
convection over the flow structure decreases with the decreasing of the
inclination angle of sidewalls of the cavity. For Ri = 1, an optimum air
draft corresponds to an inclination angle in the vicinity of 22° while
for Ri = 10 or
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