Numerical Analysis Of Regular And Irregular Surface Roughness In A Microchannel Using Lbm

To investigate the thermal and hydrodynamic behaviors in a rough microchannel, the alternative arrangement of mixing triangular and rectangular ribs for regular and irregular spaced and heights has been considered using thermal lattice Boltzmann method (TLBM). The TLBM is a kinetic method based on the particle distribution function, so it can successfully be implemented to study the flow dependence on Knudsen number including slip velocity, pressure drop in rough microchannel. The friction coefficients in terms of Poiseuille number (Pn) and the rate of heat transfer in terms of Nusselt number (Nu) have been discussed in order to study the effect of surface roughness geometries in the slip flow regime at Knudsen number (Kn), ranging from 0.01 to 0.10. It was found that the effect of surface roughness is more pronounced at low Knudsen numbers as well as random spaced and heights. Finally, the thermo-hydraulic performances have been discussed for various cases numerically and the results are compared with the smooth microchannel.