Local heat and mass transfer measurements for multi-layered impingement/effusion cooling: Effects of pin spacing on the impingement and effusion plate

Seon Ho Kim, Kyeong Hwan Ahn, Jun Su Park, Eui Yeop Jung, Ki Young Hwang, Hyung Hee Cho

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Practical implementation of transpiration cooling system can be realized by multi-layered impingement/effusion cooling system which is composed of two or more layers with pins. Due to restrictions of very low height in multi-layered impingement/effusion cooling, heat transfer characteristics are affected by pin space to diameter. In this paper, the effects of pin space to diameter ratio, sp/d, are investigated on all internal surfaces including impingement plate and pin surfaces. Local heat/mass transfer measured using a naphthalene sublimation method. The ratio of height to diameter ratio, h/d, is fixed at 0.25, and Reynolds number based on the hole diameter is 3000. As a results, heat transfer characteristics on effusion plate are similar to narrow impingement jet cooling without pins, in the case of sp/d = 6.0. Local Sherwood number distributions are affected by biased location of pins at sp/d = 2 and 1.5. Pins block the flow channel, and make flow area narrower. The secondary peak moved outwards in the radial direction, 18%, and Sherwood number of the secondary peak was enhanced by 6%. Comparing the heat/mass transfer of all of the cases, and considering pumping power, increasing pins (decreasing sp/d) resulted in superior performance. Comparison factor of sp/d = 2.0 and sp/d = 1.5 was on the 2.2.

Original languageEnglish
Pages (from-to)712-722
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Volume105
DOIs
Publication statusPublished - 2017 Feb 1

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All Science Journal Classification (ASJC) codes

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

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