Experimental and numerical analysis on thermal-dynamic performance in designed impingement-jet double-layer nested microchannel heat sinks with streaming vertical bifurcations
Xin Cao, Ya Zhuo, Xinyue Lan, Han Shen
Abstract
The paper presents a new composite structure made up of a double-layer microchannel structure, an impinging jet structure, and a turbulent flow structure. In this paper, the combination of these three structures improves the overall thermal performance of the model compared to the basic impingement-jet double-layer nested microchannel heat sinks (IDN-MHS) model. At Reynolds numbers ranging from 138.2 to 580.4 (0.25≤u in ≤1.05), the thermal performance of the model within introduction of bifurcations is enhanced compared to traditional models that only contain double-layer microchannel structures and impact jet structures. Using 3D printers and conducting experiments, it was discovered that numerical simulation and experimental images were generally consistent. Additionally, IDN-MHS with streaming vertical bifurcations, n=6 (IDN-MHS-VB6) performed well in numerical simulations, with a temperature decrease of 1.24K over IDN-MHS when compared to IDN-MHS. In addition, this model performs better than IDN-MHS with streaming vertical bifurcations, n=2, IDN-MHS with streaming vertical bifurcations, n=4, and IDN-MHS with streaming vertical bifurcations, n=8 (IDN-MHS-VB2/4/8). Compared to IDN-MHS, IDN-MHS-VB6 has the outstanding advantage of reducing substrate temperature while maintaining a relatively low pressure drop.