An Experimental Study of Microchannel and Micro-Pin-Fin Based On-Chip Cooling Systems with Silicon-to-Silicon Direct Bonding

Abstract

This paper describes an experimental study of the cooling capabilities of microchannel and micro-pin-fin based on-chip cooling systems. The on-chip cooling systems integrated with a micro heat sink, simulated power IC (integrated circuit) and temperature sensors are fabricated by micromachining and silicon-to-silicon direct bonding. Three micro heat sink structures: a microchannel heat sink (MCHS), an inline micro-pin-fin heat sink (I-MPFHS) and a staggered micro-pin-fin heat sink (S-MPFHS) are tested in the Reynolds number range of 79.2 to 882.3. The results show that S-MPFHS is preferred if the water pump can provide enough pressure drop. However, S-MPFHS has the worst performance when the rated pressure drop of the pump is lower than 1.5 kPa because the endwall effect under a low Reynolds number suppresses the disturbance generated by the staggered micro pin fins but S-MPFHS is still preferred when the rated pressure drop of the pump is in the range of 1.5 to 20 kPa. When the rated pressure drop of the pump is higher than 20 kPa, I-MPFHS will be the best choice because of high heat transfer enhancement and low pressure drop price brought by the unsteady vortex street.

Automatically adaptive cooling of hotspots by a fractal microchannel heat sink embedded with thermo‐responsive hydrogels

“…[14][15][16] Wang et al 17 firstly proposed fractal rectangular microchannel networks with relatively lower pressure drop and more uniform temperature distribution. Then, disk-like, 17 treelike, 18 Y-like, 19 and I-like 20 fractal microchannel heat sinks are designed and their cooling performance has also been studied continually. The results show potential application prospects of fractal microchannel heat sinks with remarkable heat transfer capacity, better temperature uniformity, and relatively lower pressure drop than other kinds of microchannel heat sinks.…”