Numerical investigation of heat transfer enhancement via dimpled target surface configuration and jet arrangement in impingement cooling
f dimple configurations on heat transfer. Specifically, it focuses on the 3x3 array of jets directed at a dimpled target surface. The study explores various jet pitches (P = 3Dj, 4Dj and 5Dj) and distances between jets and the dimpled surface (H = 3Dj, 4Dj and 5Dj). Additionally, dimple designs w...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Aeronautical and Astronautical Society of the Republic of China
2024
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/111379/2/111379_Numerical%20investigation%20of%20heat%20transfer%20enhancement.pdf http://irep.iium.edu.my/111379/8/111379_%20Numerical%20investigation%20of%20heat%20transfer%20enhancement_Scopus.pdf http://irep.iium.edu.my/111379/ https://www.ipress.tw/J0039?pWebID=588&pType=4&mSeq=1 https://doi.org/10.6125/JoAAA.202403_56(1S).02 |
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| Institution: | Universiti Islam Antarabangsa Malaysia |
| Language: | English English |
| Summary: | f dimple configurations on heat transfer. Specifically, it focuses on the 3x3
array of jets directed at a dimpled target surface. The study explores various
jet pitches (P = 3Dj, 4Dj and 5Dj) and distances between jets and the dimpled
surface (H = 3Dj, 4Dj and 5Dj). Additionally, dimple designs were altered
while keeping their volume constant, resulting in elongated dimples. This
investigation comprehensively examines flow patterns and heat transfer
properties across Reynolds number (Re) range of 5,000 to 15,000. Increasing
the H/Dj ratio from 4 to 5 enlarges entrainment vortices near the target surface
due to reduced cross flow intensity between adjacent jets. Conversely,
reducing the ratio to 3 intensifies crossflow, delaying cooling jet detachment
and enhancing heat transfer. Evaluating the smallest jet-to-jet pitch (Px = 3Dj)
reveals enhanced heat transfer to the target surface, driven by increased
coolant mass flow rate per unit area compared to larger jet pitches (Px = 4Dj
and Px = 5Dj). When altering dimple depths while maintaining constant
volume, Nusselt numbers (Nu) showed improvements ranging from 10% to
16%, surpassing the 6% to 14% increase seen with hemisphere dimples |
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