Abstract
The frictional and thermal entropy generation rates (Sfr and Sth) of two heatsinks with serpentine (Conf. A) and double serpentine (Conf. B) channels with water/silver Nano fluid (NF) were numerically investigated. The results demonstrated that the augmentation of nanoparticle concentration (phi) from 0% to 1% leads to decrease Sth by 6.36% and 3.51% in Conf. A and Conf. B, respectively, for Re=500. The escalation of Re from 500 to 2000 increases this percentages to 9.93% and 7.51%, respectively. Also, the increase of Re from 500 to 2000 at a constant phi reduces Sth by 63% and 68% in Conf. A and Conf. B, respectively, due to enhance the heat dissipation. Moreover, the increasing of phi from 0% to 1% decreases Sfr by 12.41% in both configurations and at four studied Res due to decreasing the NF velocity. Besides, the escalation of Re from 500-2000 intensifies Sfr nearly by 62% and 67% in Conf. A and Conf. B, respectively. The entropy contour plots reveal that Sfr intensifies near the turn regions of the serpentine channels. Also, Sth is intensifies at the entrance of heatsink channels due to the high temperature gradient at these points. Conversely, Sfr escalates at the exit of the channels due to intensification of the vortexes formed at the turn parts and along the serpentine channel.