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research-article

General Characterization of Jet impingement array heat sinks with interspersed fluid extraction ports for uniform high flux cooling

[+] Author and Article Information
Alexander S Rattner

Department of Mechanical and Nuclear Engineering Pennsylvania State University 236A Reber Building University Park, PA 16802
Alex.Rattner@psu.edu

1Corresponding author.

ASME doi:10.1115/1.4036090 History: Received October 20, 2016; Revised February 16, 2017

Abstract

In conventional jet impingement array heat sinks, all spent coolant is extracted from component edges, resulting in cross-flow interference and non-uniform heat transfer. Jet impingement arrays with interspersed fluid extraction ports can reduce cross-flow, improving heat transfer uniformity and reducing pumping loads. While this configuration offers technical advantages, limited pressure drop and heat transfer data are available. In this investigation, simulations are performed of laminar single-phase jet impingement arrays with interspersed fluid extraction ports over varying flow rates (Rej = 20 - 500), fluid transport properties (Pr = 1 - 100), and geometries (jet pitch to diameter ratios of 1.8 - 7.1, jet diameter to gap height ratios of 0.1 - 4.0). The simulation approach is validated for isolated jet impingement, and grid sensitivity studies are performed to quantify numerical uncertainty. 1000 randomized cases are evaluated to develop new correlations for Nusselt number and pressure drop k-factors. Conjugate heat transfer studies are performed to compare heat sinks (5 × 5 mm heated, 500 W m-2 heat flux) employing jet arrays with interspersed fluid extraction ports, microchannels, and jet arrays with edge fluid extraction. The design with jet arrays with interspersed fluid extraction ports yields lower average temperatures, improved temperature uniformity, and modest pressure drops. This study provides new data for jet impingement thermal management and highlights the technical potential of configurations with interspersed fluid extraction ports.

Copyright (c) 2017 by ASME
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