Heat transfer on flat surface impinged by an underexpanded sonic jet

Man Sun Yu, Byung Gi Kim, Hyung Hee Cho

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Underexpanded impinging jets include complicated flow phenomena such as shock structure, sonic surface, and recirculation zone in a central impingement region, and the local heat transfer on an impinged surface has a different characteristic than a subsonic impinging jet. Studying this can be helpful in understanding the relation between supersonic flow characteristics and heat transfer on a surface. It can also provide a proper design factor for the impingement cooling technique by a high-speed jet. The convective heat transfer coefficients have been measured on a flat surface impinged by an underexpanded sonic jet. In addition, the visualization of shock structures and surface pressure measurements have been conducted to support the heat transfer measurement results. From the results, the distribution of the heat transfer coefficient on the central impingement region due to the interaction between the sonic surface and recirculation flow has been obtained. It has also been observed that the turbulence diffusion from the shear layers around the jet edge and the sonic surface into a jet core induce high heat transfer on a surface.

Original languageEnglish
Pages (from-to)448-454
Number of pages7
JournalJournal of Thermophysics and Heat Transfer
Volume19
Issue number4
DOIs
Publication statusPublished - 2005 Jan 1

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flat surfaces
heat transfer
impingement
heat transfer coefficients
shock
supersonic flow
convective heat transfer
flow characteristics
shear layers
pressure measurement
turbulence
high speed
cooling
interactions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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Heat transfer on flat surface impinged by an underexpanded sonic jet. / Yu, Man Sun; Kim, Byung Gi; Cho, Hyung Hee.

In: Journal of Thermophysics and Heat Transfer, Vol. 19, No. 4, 01.01.2005, p. 448-454.

Research output: Contribution to journalArticle

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