Abstract:
In this paper, a common and widely used micro-heat sink (H/S) was redesigned and simulated
using computational fluid dynamics methods. This H/S has a large number of microchannels
in which the walls are wavy (wavy microchannel heat sink: WMCHS). To improve cooling, two
(Al2O3 and CuO) water-based nanofluids (NFs) were used as cooling fluids, and their performance
was compared. For this purpose, studies were carried out at three Reynolds numbers (Re) of 500,
1000, and 1500 when the volume percent (j) of the nanoparticles (NPs) was increased to 2%. The
mixture two-phase (T-P) model was utilized to simulate the NFs. Results showed that using the
designed WMCHS compared to the common H/S reduces the average and maximum temperatures
(T-Max) up to 2 C. Moreover, using the Al2O3 NF is more suitable in terms of WMCHS temperature
uniformity as well as its thermal resistance compared to the CuO NF. Increasing the j is desirable in
terms of temperature, but it enhances the pumping power (PP). Besides, the Figure of Merit (FOM)
was investigated, and it was found that the value is greater at a higher volume percentage.
