Jet impingement in a crossflow configuration

Convective boiling and local heat transfer characteristics

Geehong Choi, Beom Seok Kim, Hwanseong Lee, Sangwoo Shin, Hyung Hee Cho

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Flow boiling accompanied impingement jet was highly desired to enhance convective heat transfer. The secondary jet impingement system was designed to get enhanced heat transfer performance. The fluidic behavior was analyzed through visualization, and the local heat transfer was evaluated using an array of resistance temperature detector (RTD) sensors. The dielectric fluid FC-72 was used as coolant, and flowed through the rectangular channel with flow rate of Re. =. 6000 and saturated condition. We confirmed that the jet blowing ratio significantly influenced to the fluidic structure and local heat transfer distributions. Reinforced convective motion by jet flow removed bubbles on the heating surface, and increased local heat transfer coefficient by 59% with decreased wall superheat by 11% at the jet blowing ratio of 1:5. Whereas more intensified convective flow could delay onset of nucleate boiling (ONB) by disturbing thermal boundary layer at the jet blowing ratio of 1:10. Critical heat flux (CHF) increased quasi-linearly by increasing of the jet blowing ratio leading to the reinforcement of total fluidic momentum. Based on the results of the various jet blowing ratios and consequent local/overall heat transfer data, we conclude that the jet blowing ratio of 1:5 is an optimized condition for enhancing heat transfer coefficient at a given exit quality in the tested blowing ratios.

Original languageEnglish
Pages (from-to)378-385
Number of pages8
JournalInternational Journal of Heat and Fluid Flow
Volume50
DOIs
Publication statusPublished - 2014 Dec 1

Fingerprint

jet impingement
blowing
boiling
Boiling liquids
Blow molding
heat transfer
Heat transfer
configurations
fluidics
Fluidics
heat transfer coefficients
Heat transfer coefficients
nucleate boiling
thermal boundary layer
jet flow
convective flow
convective heat transfer
coolants
reinforcement
Nucleate boiling

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Jet impingement in a crossflow configuration: Convective boiling and local heat transfer characteristics",
abstract = "Flow boiling accompanied impingement jet was highly desired to enhance convective heat transfer. The secondary jet impingement system was designed to get enhanced heat transfer performance. The fluidic behavior was analyzed through visualization, and the local heat transfer was evaluated using an array of resistance temperature detector (RTD) sensors. The dielectric fluid FC-72 was used as coolant, and flowed through the rectangular channel with flow rate of Re. =. 6000 and saturated condition. We confirmed that the jet blowing ratio significantly influenced to the fluidic structure and local heat transfer distributions. Reinforced convective motion by jet flow removed bubbles on the heating surface, and increased local heat transfer coefficient by 59{\%} with decreased wall superheat by 11{\%} at the jet blowing ratio of 1:5. Whereas more intensified convective flow could delay onset of nucleate boiling (ONB) by disturbing thermal boundary layer at the jet blowing ratio of 1:10. Critical heat flux (CHF) increased quasi-linearly by increasing of the jet blowing ratio leading to the reinforcement of total fluidic momentum. Based on the results of the various jet blowing ratios and consequent local/overall heat transfer data, we conclude that the jet blowing ratio of 1:5 is an optimized condition for enhancing heat transfer coefficient at a given exit quality in the tested blowing ratios.",
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Jet impingement in a crossflow configuration : Convective boiling and local heat transfer characteristics. / Choi, Geehong; Kim, Beom Seok; Lee, Hwanseong; Shin, Sangwoo; Cho, Hyung Hee.

In: International Journal of Heat and Fluid Flow, Vol. 50, 01.12.2014, p. 378-385.

Research output: Contribution to journalArticle

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