Effects of new methods of porosity arrangement on forced convection in a variable BDPM using numerical simulation

In this study, forced convection the heat generation components by cooling porous elements has been investigated using BDPM method. A developed code under FVM and Simple Algorithm is used for numerical simulation. Air is selected as the working fluid with Pr = 0.7 in the laminar state. Effects of variable permeability distribution was investigated by changing the permeability in each column of porous blocks in increasing, decreasing, sinusoidal, and cosine patterns. In addition, the influences of average Darcy number and Darcy domain alterations of the porous blocks has been simulated. Sinusoidal pattern has the largest system performance under Re = 400-1000. In comparison with constant pattern, system performance has increased up to 9.5 times for sinusoidal pattern. Likewise, heat transfer in variable pattern is greater than constant one. The effects of variable pattern become more evident by changing average Darcy number since Darcy reaches 10(-3), which will optimize heat transfer and system performance. Based on Darcy domain changes in the columns, it could be found that Darcy domain also affects heat transfer and pressure drop. These changes in Darcy domain can increase the system performance up to about 2.2 times.