Steady and Unsteady Air Impingement Heat Transfer for Electronics Cooling Applications

Mehmet Arik, Rajdeep Sharma, Jason Lustbader, Xin He

Research output: Contribution to journalArticlepeer-review

38 Scopus Citations

Abstract

This paper focuses on two forced convection methods-steady jet flow and pulsating flow by synthetic jets-that can be used in applications requiring significant amounts of heat removal from electronics components. Given the dearth of available data, we have experimentally investigated steady jets and piezoelectrically driven synthetic jets that provide pulsating flow of air at a high coefficient of performance. To mimic a typical electronics component, a 25.4-mm×25.4-mm vertical heated surface was used for heat removal. The impingement heat transfer, in the form of Nusselt number, is reported for both steady and unsteady jets over Reynolds numbers from 100 to 3000. The effect of jet-to-plate surface distance on the impingement heat transfer is also investigated. Our results show that synthetic jets can provide significantly higher cooling than steady jets in the Reynolds number range of 100 to 3000. We attribute the superior performance of synthetic jets to vortex shedding associated with the unsteady flow.

Original languageAmerican English
Article numberArticle No. 111009
Number of pages8
JournalJournal of Heat Transfer
Volume135
Issue number11
DOIs
StatePublished - 2013

NREL Publication Number

  • NREL/JA-5400-56618

Keywords

  • Electronics cooling
  • Impingement cooling
  • Pulsating flow
  • Steady jets
  • Synthetic jets
  • Unsteady heat transfer

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