Heat transfer properties of single crystal diamond zigzag double-layer microchannel heat sinks

Abstract

Efficient heat transfer in modern microelectronic devices plays an essential part in improving the devices functionality and lifetime. Microchannel heat sinks offer excellent heat transfer properties, and have widespread applications in highly integrated electronic devices. The flow and heat transfer properties of single crystal diamond zigzag double-layer microchannel heat sinks (DL-MCHSs) were investigated by numerical simulation. The mechanism of enhanced heat transfer in zigzag DL-MCHSs was analyzed by the velocity, temperature and pressure fields, and the geometric parameters of the single crystal diamond DL-MCHSs were evaluated and optimized by means of performance evaluation criteria. The results illustrate that the zigzag channel not only increases the convective area, but also enhances the fluid disturbance leading to higher degree of fluid blending, which greatly enhance the heat transfer of the single crystal diamond DL-MCHSs. Upper zigzag and lower zigzag single crystal diamond DL-MCHSs can offer the highest performance evaluation criteria among the four structures. When Re = 700, the relative height of zigzag (α), the number of zigzag cycles (β), and the height ratio of upper to lower channels (γ) are 0.5, 45, and 1.2, respectively, the optimized upper zigzag and lower single crystal diamond zigzag DL-MCHSs achieve the 38 % enhancement in comprehensive performance. This work contributes to the corresponding scientific instruction for the management and implementation of the single crystal diamond DL-MCHSs.