Numerical Analysis of Flow and Heat Transfer Characteristics of Double-Layer Heterogeneous Single Crystal Diamond Microchannel Heat Sinks

Abstract

The heat removal demand of high heat flux microelectronic devices is increasing day by day, for effectively enhance the comprehensive performance of double-layer microchannel heat sinks (DL-MHSs). A novel type double-layer heterogeneous single crystal diamond microchannel heat sink (DLH-SCD-MHS) is designed and numerically calculated. The top channel is rectangular, and the bottom channel has various cavities and rib combinations. The comprehensive performance of the DLH-SCD-MHS was analyzed by the correlation with pumping power and thermal resistance, and the enhanced heat transfer factor (η). The outcome shows that the DLH-SCD-MHS significantly enhances the heat transfer while appropriately sacrificing part of the pressure drop. Compared with the traditional DL-MHS, the DLH-SCD-MHS has increased the pressure drop by 23.8 ~ 43.5%, the heat transfer coefficient is enhanced by 74.5 ~ 117.1%, and the η is improved by 62.5 ~ 87.4%. The DLH-SCD-MHS can reduce the irreversible loss, and the minimum augment entropy generation number of the DLH-SCD-MHS with rectangular cavity and rectangular rib (Model V) is 0.64. As Re = 874, the relative rib width, the relative rib length and the relative position of the ribs of the Model V are 0.5, 0.571 and 0.5, respectively, the maximum η is 1.97. The DLH-SCD-MHS provides new insights for the management of the heat transfer system of microelectronic devices.

Keywords: Single crystal diamond, Double-layer heterogeneous microchannel heat sink, Pressure drop, heat transfer, Enhanced heat transfer factor