Numerical Study on Flow and Heat Transfer Characteristics of Jet Impinging Cold Plate for Local High Heat Flux Device

Abstract

In order to solve the problem of local high heat flux thermal management in high-power radar and other equipment, research on large format and non-uniform high heat flux heat dissipation technology is carried out. With a newly proposed embedded jet impinging cold plate capable of simultaneous heat dissipation on both the upper and lower sides, numerical simulations of flow and heat transfer characteristics of the impinging cooling process are carried out in confined space. The heat transfer characteristics inside the embedded jet impinging cold plate are obtained and the effects of jet height, jet diameter and cold plate volume flow rate on heat dissipation performance are discussed. The results show that the heat transfer coefficient distribution characteristics of the embedded jet impinging cold plate meet the requirement for local high heat flux heat dissipation of a 50×72 mm2 heating surface with a background heat flux of 1.2 W/cm2 and arranged with eight 3×3.5 mm2, 125 W/cm2 high heat flux chips. Considering the heat transfer performance and pressure drop, the cold plate gains its optimum performance at the jet height of 3 mm and diameter of 2 mm. At the cold pate volume flow rate of 5.5 L/min, the maximum temperature rise of the chip is 15.6 ℃, and the pressure drop is 3.917 kPa. The embedded jet impinging cold plate proposed in this paper and the research results are applicable to thermal management of non-uniform high heat flux devices.