설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제23권11호
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  • Pages.754-761
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  • 2011
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
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다양한 노즐 수 변화에 따른 충돌 제트의 열전달 특성에 관한 수치적 연구

A Numerical Study on the Heat Transfer Characteristics of the Multiple Slot Impinging Jet

  • Kim, Sang-Keun (School of Mechanical Engineering, Pusan National University) ;
  • Ha, Man-Yeong (School of Mechanical Engineering, Pusan National University) ;
  • Son, Chang-Min (School of Mechanical Engineering, Pusan National University)
  • 투고 : 2011.03.09
  • 심사 : 2011.10.14
  • 발행 : 2011.11.10
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초록

The present study numerically investigates two-dimensional flow and heat transfer in the multiple confined impinging slot jet. Numerical simulations are performed for the different Reynolds numbers(Re=100 and 200) in the range of nozzles from 1 to 9 and height ratios(H/D) from 2 to 5, where H/D is the ratio of the channel height to the slot width. The vector plots of velocity profile, stagnation and averaged Nusselt number distributions are presented in this paper. The dependency of thermal fields on the Reynolds number, nozzle number and height ratio can be clarified by observing the Nusselt number as heat transfer characteristic at the stagnation point and impingement surface. The Nusselt number at the stagnation point of the central slot shows unsteadiness at H/D=3 and Re=200. The value of Nusselt number at the stagnation point of the central slot decreases with higher Reynolds number and number of nozzle although overall area averaged Nusselt number increases. Hence careful selection of geometrical parameters and number of nozzle are necessary for optimization of the heat transfer performance of multiple slot impinging jet.

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참고문헌

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