Heat/mass transfer with circular pin fins in impingement/effusion cooling system with crossflow

Sung Kook Hong, Dong Ho Rhee, Hyung Hee Cho

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The purpose of the present study is to investigate the local heat/mass transfer characteristics with circular pin fins in the impingement/effusion cooling with an initial crossflow. The results are compared with those for the cases without pin fins and with rib turbulators. The pin fins are installed between two perforated plates and the crossflow passes between these two plates. A blowing ratio is changed from 0.5 to 1.5 for the fixed jet Reynolds number of 10,000. The local heat/mass transfer coefficients on the effusion plate are measured using a naphthalene sublimation method. When circular pin fins are installed in the impingement/effusion system, heat/mass transfer is augmented due to the generation of vortex and wake. Especially, locally low heat/mass transfer regions in front of the effusion hole are reduced. Because pin fins divert the crossflow passing in the injection hole region, the wall jet is less swept away than the case without pin fins, which results in the increase of heat/mass transfer. As the blowing ratio increases, the pin fins lead to higher heat/mass transfer than the case without pin fins. Compared with rib turbulators, the pin fins yield lower average Sh value at M = 1.0 but higher average Sh value at other blowing ratios.

Original languageEnglish
Pages (from-to)728-737
Number of pages10
JournalJournal of Thermophysics and Heat Transfer
Volume20
Issue number4
DOIs
Publication statusPublished - 2006 Jan 1

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impingement
cooling systems
fins
mass transfer
heat
blowing
perforated plates
wall jets
sublimation
naphthalene
wakes
Reynolds number
vortices
injection
cooling
coefficients

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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Heat/mass transfer with circular pin fins in impingement/effusion cooling system with crossflow. / Hong, Sung Kook; Rhee, Dong Ho; Cho, Hyung Hee.

In: Journal of Thermophysics and Heat Transfer, Vol. 20, No. 4, 01.01.2006, p. 728-737.

Research output: Contribution to journalArticle

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