In this study, effects of extended jet holes to heat transfer and flow characteristics of jet impingement cooling were numerically investigated. Cross-flow in the impinging jet cooling adversely affects the heat transfer on the target surface. The main purpose of this study is to reduce the negative effect of cross-flow on heat transfer by extending jet holes toward the target surface with nozzles. This study has been conducted under turbulent flow condition (15,000 ≤ Re ≤ 45,000). The surface of the turbine blade, which is the target surface, has been modeled as a flat plate. The effect of the ribs, placed on the target surface, on the heat transfer has been also investigated, and the results were compared with the flat surface. The parameters such as average and local Nusselt numbers on the target surface, flow characteristics, and compressor power have been examined in detail. It was obtained from the numerical results that the average Nusselt number increases with decreasing the gap between the target surface and the nozzle. In addition, the higher average Nusselt number was obtained on the flat surface than the ribbed surface. The lowest compressor power was achieved in the 5Dj nozzle gap for the flat surface and in the 4Dj nozzle gap for the ribbed surface.
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Research-Article
Effects of Extended Jet Holes to Heat Transfer and Flow Characteristics of the Jet Impingement Cooling
Ahmet Ümit Tepe,
Ahmet Ümit Tepe
Abana Sabahat Mesut Yılmaz Vocational School,
Kastamonu University,
Kastamonu 37970, Turkey
e-mail: autepe@kastamonu.edu.tr
Kastamonu University,
Kastamonu 37970, Turkey
e-mail: autepe@kastamonu.edu.tr
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Kamil Arslan,
Kamil Arslan
Faculty of Engineering,
Karabük University,
Karabük 78050, Turkey;
Faculty of Mechanical Engineering,
Karabük University,
Karabük 78050, Turkey
e-mail: kamilarslan@karabuk.edu.tr
Karabük University,
Karabük 78050, Turkey;
Faculty of Mechanical Engineering,
Karabük University,
Karabük 78050, Turkey
e-mail: kamilarslan@karabuk.edu.tr
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Yaşar Yetişken,
Yaşar Yetişken
Faculty of Engineering,
Karabük University,
Karabük 78050, Turkey;
Faculty of Mechanical Engineering,
Karabük University,
Karabük 78050, Turkey
e-mail: yyetisken@karabuk.edu.tr
Karabük University,
Karabük 78050, Turkey;
Faculty of Mechanical Engineering,
Karabük University,
Karabük 78050, Turkey
e-mail: yyetisken@karabuk.edu.tr
Search for other works by this author on:
Ünal Uysal
Ünal Uysal
Faculty of Engineering,
Sakarya University,
Sakarya 54050, Turkey;
Faculty of Mechanical Engineering,
Sakarya University,
Sakarya 54050, Turkey
e-mail: uysal@sakarya.edu.tr
Sakarya University,
Sakarya 54050, Turkey;
Faculty of Mechanical Engineering,
Sakarya University,
Sakarya 54050, Turkey
e-mail: uysal@sakarya.edu.tr
Search for other works by this author on:
Ahmet Ümit Tepe
Abana Sabahat Mesut Yılmaz Vocational School,
Kastamonu University,
Kastamonu 37970, Turkey
e-mail: autepe@kastamonu.edu.tr
Kastamonu University,
Kastamonu 37970, Turkey
e-mail: autepe@kastamonu.edu.tr
Kamil Arslan
Faculty of Engineering,
Karabük University,
Karabük 78050, Turkey;
Faculty of Mechanical Engineering,
Karabük University,
Karabük 78050, Turkey
e-mail: kamilarslan@karabuk.edu.tr
Karabük University,
Karabük 78050, Turkey;
Faculty of Mechanical Engineering,
Karabük University,
Karabük 78050, Turkey
e-mail: kamilarslan@karabuk.edu.tr
Yaşar Yetişken
Faculty of Engineering,
Karabük University,
Karabük 78050, Turkey;
Faculty of Mechanical Engineering,
Karabük University,
Karabük 78050, Turkey
e-mail: yyetisken@karabuk.edu.tr
Karabük University,
Karabük 78050, Turkey;
Faculty of Mechanical Engineering,
Karabük University,
Karabük 78050, Turkey
e-mail: yyetisken@karabuk.edu.tr
Ünal Uysal
Faculty of Engineering,
Sakarya University,
Sakarya 54050, Turkey;
Faculty of Mechanical Engineering,
Sakarya University,
Sakarya 54050, Turkey
e-mail: uysal@sakarya.edu.tr
Sakarya University,
Sakarya 54050, Turkey;
Faculty of Mechanical Engineering,
Sakarya University,
Sakarya 54050, Turkey
e-mail: uysal@sakarya.edu.tr
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 18, 2019; final manuscript received May 16, 2019; published online June 20, 2019. Assoc. Editor: Guihua Tang.
J. Heat Transfer. Aug 2019, 141(8): 082202 (14 pages)
Published Online: June 20, 2019
Article history
Received:
February 18, 2019
Revised:
May 16, 2019
Citation
Tepe, A. Ü., Arslan, K., Yetişken, Y., and Uysal, Ü. (June 20, 2019). "Effects of Extended Jet Holes to Heat Transfer and Flow Characteristics of the Jet Impingement Cooling." ASME. J. Heat Transfer. August 2019; 141(8): 082202. https://doi.org/10.1115/1.4043893
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