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

1 Citation (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

Fingerprint

impingement
Cooling systems
mass transfer
Mass transfer
heat transfer
spacing
Heat transfer
Cooling
cooling
Transpiration
Sublimation
Channel flow
Naphthalene
Reynolds number
cooling systems
sweat cooling
jet impingement
heat
Hot Temperature
channel flow

All Science Journal Classification (ASJC) codes

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

Cite this

@article{41a3676b85df4541bd1ef6c36634139e,
title = "Local heat and mass transfer measurements for multi-layered impingement/effusion cooling: Effects of pin spacing on the impingement and effusion plate",
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.",
author = "Kim, {Seon Ho} and Ahn, {Kyeong Hwan} and Park, {Jun Su} and Jung, {Eui Yeop} and Hwang, {Ki Young} and Cho, {Hyung Hee}",
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Local heat and mass transfer measurements for multi-layered impingement/effusion cooling : Effects of pin spacing on the impingement and effusion plate. / Kim, Seon Ho; Ahn, Kyeong Hwan; Park, Jun Su; Jung, Eui Yeop; Hwang, Ki Young; Cho, Hyung Hee.

In: International Journal of Heat and Mass Transfer, Vol. 105, 01.02.2017, p. 712-722.

Research output: Contribution to journalArticle

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T2 - Effects of pin spacing on the impingement and effusion plate

AU - Kim, Seon Ho

AU - Ahn, Kyeong Hwan

AU - Park, Jun Su

AU - Jung, Eui Yeop

AU - Hwang, Ki Young

AU - Cho, Hyung Hee

PY - 2017/2/1

Y1 - 2017/2/1

N2 - 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.

AB - 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.

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