# Numerical Study of Interrupted Impinging Jets for Cooling of Electronics

Behera, Ramesh Chandra and Dutta, Pradip and Srinivasan, K (2007) Numerical Study of Interrupted Impinging Jets for Cooling of Electronics. In: IEEE Transactions on Components and Packaging Technologies, 30 (2). pp. 275-284.

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## Abstract

The objective of this paper is to present the results of a numerical investigation of the effect of flow pulsations on local, time-averaged Nusselt number of an impinging air jet. The problem was considered to provide inputs to augmenting heat transfer from electronic components. The solution is sought through the FLUENT (Version 6.0) platform. The standard $k\in$ model for turbulence equations and two-layer zonal model in wall function are used in the problem. Pressure-velocity coupling is handled using the SIMPLEC algorithm. The model is first validated against some experimental results available in the literature. A parametric study is carried out to quantify the effect of the pulsating jets. The parameters considered are 1) average jet Reynolds number (5130<Re<8560), 2) sine and square wave pulsations, 3) frequencies of pulsations (25 < f < 400 Hz), and 4) height of impingement to jet diameter ratios (5 < H/d < 9). In the case of sine wave pulsations, the ratio of root mean square value of the amplitude to the average value $(A_N )$ was varied from 18% to 53%. The studies are restricted to a constant wall heat flux condition. Parametric conditions for which enhancement in the time-averaged heat transfer from the surface can be expected are identified.

Item Type: Journal Article Copyright 2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Heat flux condition;Impinging air jet;Pulsating jet Division of Mechanical Sciences > Mechanical Engineering 11 Sep 2007 19 Sep 2010 04:39 http://eprints.iisc.ernet.in/id/eprint/11789