Effects of fin shapes and arrangements on heat transfer for impingement/effusion cooling with crossflow

Sung Kook Hong, Oong Ho Rhee, Hyung Hee Cho

Research output: Contribution to conferencePaper

4 Citations (Scopus)

Abstract

The present paper has investigated the effects of fin on the flow and heat/mass transfer characteristics for the impingement/effusion cooling with crossflow. The fins of circular or rectangular shape are installed between two perforated plates and the crossflow passes between these two plates. The blowing ratio is changed from 0.5 to 1.5 for a fixed jet Reynolds number of 10,000. A naphthalene sublimation method is used to obtain the local heat/mass transfer coefficients on the effusion plate. A numerical calculation is also performed to investigate the flow characteristics. Flow and heat/mass transfer characteristics are changed significantly due to installation of fins. In the injection region, wall jet spreads more widely than the case without fins because fin prevents the wall jet from being swept away by the crossflow. In the effusion region, higher heat/mass transfer coefficient is obtained due to the flow disturbance and acceleration by the fin. As the blowing ratio increases, the effects of fin against the crossflow become more significant and then the higher average heat/mass transfer coefficients are obtained. Especially, the cases with rectangular fins have about 40%-45% enhancement at the high blowing ratio of M=1.5. However, the increase of blockage effect gives more pressure loss in the channel.

Original languageEnglish
Pages1325-1337
Number of pages13
DOIs
Publication statusPublished - 2005 Nov 23
EventASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future - Reno-Tahoe, NV, United States
Duration: 2005 Jun 62005 Jun 9

Other

OtherASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future
CountryUnited States
CityReno-Tahoe, NV
Period05/6/605/6/9

Fingerprint

Fins (heat exchange)
Mass transfer
Heat transfer
Cooling
Blow molding
Perforated plates
Sublimation
Naphthalene
Reynolds number
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Hong, S. K., Rhee, O. H., & Cho, H. H. (2005). Effects of fin shapes and arrangements on heat transfer for impingement/effusion cooling with crossflow. 1325-1337. Paper presented at ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future, Reno-Tahoe, NV, United States. https://doi.org/10.1115/GT2005-68684
Hong, Sung Kook ; Rhee, Oong Ho ; Cho, Hyung Hee. / Effects of fin shapes and arrangements on heat transfer for impingement/effusion cooling with crossflow. Paper presented at ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future, Reno-Tahoe, NV, United States.13 p.
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Hong, SK, Rhee, OH & Cho, HH 2005, 'Effects of fin shapes and arrangements on heat transfer for impingement/effusion cooling with crossflow', Paper presented at ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future, Reno-Tahoe, NV, United States, 05/6/6 - 05/6/9 pp. 1325-1337. https://doi.org/10.1115/GT2005-68684

Effects of fin shapes and arrangements on heat transfer for impingement/effusion cooling with crossflow. / Hong, Sung Kook; Rhee, Oong Ho; Cho, Hyung Hee.

2005. 1325-1337 Paper presented at ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future, Reno-Tahoe, NV, United States.

Research output: Contribution to conferencePaper

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N2 - The present paper has investigated the effects of fin on the flow and heat/mass transfer characteristics for the impingement/effusion cooling with crossflow. The fins of circular or rectangular shape are installed between two perforated plates and the crossflow passes between these two plates. The blowing ratio is changed from 0.5 to 1.5 for a fixed jet Reynolds number of 10,000. A naphthalene sublimation method is used to obtain the local heat/mass transfer coefficients on the effusion plate. A numerical calculation is also performed to investigate the flow characteristics. Flow and heat/mass transfer characteristics are changed significantly due to installation of fins. In the injection region, wall jet spreads more widely than the case without fins because fin prevents the wall jet from being swept away by the crossflow. In the effusion region, higher heat/mass transfer coefficient is obtained due to the flow disturbance and acceleration by the fin. As the blowing ratio increases, the effects of fin against the crossflow become more significant and then the higher average heat/mass transfer coefficients are obtained. Especially, the cases with rectangular fins have about 40%-45% enhancement at the high blowing ratio of M=1.5. However, the increase of blockage effect gives more pressure loss in the channel.

AB - The present paper has investigated the effects of fin on the flow and heat/mass transfer characteristics for the impingement/effusion cooling with crossflow. The fins of circular or rectangular shape are installed between two perforated plates and the crossflow passes between these two plates. The blowing ratio is changed from 0.5 to 1.5 for a fixed jet Reynolds number of 10,000. A naphthalene sublimation method is used to obtain the local heat/mass transfer coefficients on the effusion plate. A numerical calculation is also performed to investigate the flow characteristics. Flow and heat/mass transfer characteristics are changed significantly due to installation of fins. In the injection region, wall jet spreads more widely than the case without fins because fin prevents the wall jet from being swept away by the crossflow. In the effusion region, higher heat/mass transfer coefficient is obtained due to the flow disturbance and acceleration by the fin. As the blowing ratio increases, the effects of fin against the crossflow become more significant and then the higher average heat/mass transfer coefficients are obtained. Especially, the cases with rectangular fins have about 40%-45% enhancement at the high blowing ratio of M=1.5. However, the increase of blockage effect gives more pressure loss in the channel.

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Hong SK, Rhee OH, Cho HH. Effects of fin shapes and arrangements on heat transfer for impingement/effusion cooling with crossflow. 2005. Paper presented at ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future, Reno-Tahoe, NV, United States. https://doi.org/10.1115/GT2005-68684