Numerical Simulation of the Flow in an Open Cavity with Heat and Mass Transfer - Selected Topics of Computational and Experimental Fluid Mechanics - page 348

Fig. 5 Axial velocity profile ( left ) and temperature profile ( right )at x / H = 2 . 0for W p = W / 5

with three different Reynolds numbers

Fig. 6 Left Transversal concentration profiles at x / H = 2 . 0. Right Axial concentration profiles at

y / H = 0 . 6for W p = W / 5

5. The left profile is the
transversal concentration on the middle vertical line, indicating that the concentration
starts to increase, reaches a maximum value about y

Figure 6 shows the concentration profiles for W p = W /

6 and then decreases.
The larger the Reynolds number the greater the concentration values are. The right
profile is the axial concentration at y

/ H = 0 .

6, which indicates that the concentration
tends to reduce as the fluid passes through the heater. The initial reduction of the
concentration can be explained by the heating of the fluid at the region where the
vortices recirculate hot fluid. It is also observed that as the Reynolds number is
increased the variations in the concentration of the substance are lower due to less
heating of the fluid.
Figure 7 shows the effect of the heater length on the temperature profile at the
middle vertical line and the Nusselt number as a function of the Reynolds number.
From the left panel of the figure, it can be observed that increasing the length of the

/ H = 0 .