Effect of variable duty cycle flow pulsations on heat transfer enhancement for an impinging air jet

David J. Sailor, Daniel J. Rohli, Qianli Fu

Research output: Contribution to journalArticle

76 Scopus citations

Abstract

A series of experiments has been conducted in which a pulsed air jet is impinged upon a heated surface for the purpose of enhancing heat transfer relative to the corresponding steady air jet. Traditional variables such as jet to plate spacing, Reynolds number, and pulse frequency have been investigated. One additional flow variable - the duty cycle - representing the ratio of pulse cycle on-time to total cycle time is introduced and shown to be significant in determining the level of heat transfer enhancement. Specifically, heat transfer enhancement exceeding 50% is shown for a variety of operating conditions. In each case, the duty cycle producing the best heat transfer is shown to depend upon each of the other flow parameters. Recommendations are made for further experimentation into optimizing the duty cycle parameter for any particular application.

Original languageEnglish (US)
Pages (from-to)574-580
Number of pages7
JournalInternational Journal of Heat and Fluid Flow
Volume20
Issue number6
DOIs
StatePublished - Dec 1 1999
Externally publishedYes

Keywords

  • Air jet
  • Heat transfer enhancement
  • Impingement
  • Pulsating flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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