Session: 05-03 Advanced Cooling Technologies 2

Paper Number: 96635

96635 - Dual Converging Jets for Enhanced Liquid Impingement Cooling 

Jet impingement cooling is an advanced thermal management technique for high heat flux applications. Standard configurations include single, axisymmetric jets with orifice, slot, or pipe nozzles. This choice in nozzle shape, number of jets and jet inclination greatly influences the turbulence generated caused by fluid entrainment due to differences in initial velocity profiles and location of secondary stagnation points. Regarding high power electronics with integrated jet impingement schemes, turbulence and heat transfer rates must be optimized to meet the extreme cooling requirements. In this study, the heat transfer rates of dual inclined converging jets are investigated numerically and experimentally. Emphasis is placed on the location of Nusselt number peaks on the target plate with respect to geometrical parameters including nozzle pitch, incline angle, and nozzle-to-targe plate spacing. Computational fluid dynamics simulations are performed to first evaluate velocity profiles to identify Reynold’s averaged turbulence generation and secondary stagnation points. Next, a parametric experimental investigation is performed as a point of comparison using a modular, additively manufactured jet setup. Thermal energy is applied to an aluminum base plate using a 200 W resistive heater to emulate a hot spot generated in high-power electronics. Water at 20 ºC is used as the cooling medium.

Presenting Author: Reece Whitt University of Arkansas