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Numerical study on flow and heat transfer characteristics of air-jet cooling system

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Abstract

The present study aims to numerically analyze the cooling characteristics of the air-jet array in designing more efficient air-cooling system. Heat transfer and flow characteristics are also examined under different operating conditions and air-jet arrangements. The commercial CFD program (FLUENT V. 17) is used for the designed configuration where 10 specimens are cooled by the air-jet arrangement. From the result, it is found that the inner jet arrangement can make the cooling performance higher because of substantial interaction between them in the flow direction. When inner jets are installed for cooling, there is a fluid mixing zone before the specimen by short jet-to-jet distance, leading to a decrease in heat transfer. Also, the fluid mixing zones are concentrated near to the specimen because of similar flow rate between outer and inner jets. Therefore, we suggest the appropriate configuration showing the best cooling efficiency when considered the air temperature, the heat transfer coefficient, and the flow usage. The number of nozzles of inner jets is 44, but highvelocity jet is used for preventing flow mixing among the inner jets. Consequently, cooling with the outer jets effectively occurs around the specimen. This result would be helpful in determining the jet velocity and its configuration between inner and outer jets that are essential for multiple specimens cooling.

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Authors and Affiliations

  1. School of Mechanical Engineering, Chung-Ang University, Seoul, 06974, Korea

    Joo Hyun Moon, Soyeong Lee, Jee Min Park & Seong Hyuk Lee

  2. Dept. of Energy Conversion Systems, Korea Institute of Machinery & Materials, Daejeon, 34103, Korea

    Jungho Lee

  3. Dept. of Mechanical Engineering, Sogang University, Seoul, 04107, Korea

    Daejoong Kim

Authors
  1. Joo Hyun Moon
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  2. Soyeong Lee
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  3. Jee Min Park
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  4. Jungho Lee
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  5. Daejoong Kim
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  6. Seong Hyuk Lee
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Corresponding author

Correspondence to Seong Hyuk Lee.

Additional information

Recommended by Editor Yong Tae Kang

Joo Hyun Moon received Ph.D. (2017) from Chung-Ang University in Korea. He is now the postdoctoral researcher at the Chung-Ang University in Korea. His research interests are droplet evaporation, droplet impingement, interfacial phenomena, and heat transfer.

Soyeong Lee is currently M.S. student in Mechanical Engineering at Chung- Ang University. She received the B.S. from Chung-Ang University in 2015. Her research focuses on the boiling heat transfer characteristics of the impinging jet.

Jee Min Park is currently an M.S. student in Mechanical Engineering at Chung-Ang University. He received the B.S. from Chung-Ang University in 2016. His research focuses on the heat and mass transfer characteristics of the fuel cell.

Jungho Lee received his M.S. (1994) and Ph.D. (1999) degrees in Mechanical Engineering from POSTECH, Pohang, Korea. In 2006, he joined the Korea Institute of Machinery and Materials (KIMM), Daejeon, Korea, where he is currently a Director of the R&D Center for Paris Agreement of KIMM. Dr. Lee is a member of KSME, ASME, ASM, SPE and ISIJ.

Daejoong Kim received the Ph.D. in Mechanical Engineering at Stanford University, Stanford, California, in 2007. His B.S. and M.S. in Mechanical Engineering are from Seoul National University, Seoul, Korea, in 1999 and 2001, respectively. He is currently a Professor at Sogang University in Mechanical Engineering.

Seong Hyuk Lee received his B.S., M.S., and Ph.D. degrees from the Department of Mechanical Engineering in Chung-Ang University in Korea. He is now a Professor at the School of Mechanical Engineering at Chung-Ang University. He has explored various research topics on computational heat transfer, phase change, and interfacial phenomena.

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Moon, J.H., Lee, S., Park, J.M. et al. Numerical study on flow and heat transfer characteristics of air-jet cooling system. J Mech Sci Technol 32, 6021–6027 (2018). https://doi.org/10.1007/s12206-018-1152-2

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  • DOI: https://doi.org/10.1007/s12206-018-1152-2

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