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Change of Heat Transfer Characteristics in a Rotating Channel of Square Duct at Wall with Bleed Holes ( I ) - Effects of Rotation Speed -  

Kim Sang In (Graduate School of Mechanical Engineering, Yonsei University)
Kim Kyung Min (Graduate School of Mechanical Engineering, Yonsei University)
Lee Dong-Hyun (Graduate School of Mechanical Engineering, Yonsei University)
Jeon Yun Heung (Graduate School of Mechanical Engineering, Yonsei University)
Cho Hyung Hee (School of Mechanical Engineering, Yonsei University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.10, 2005 , pp. 898-906 More about this Journal
Abstract
The present study has been conducted to investigate convective heat/mass transfer in the cooling passage with bleed holes. The rotating square channel has 40.0 mm hydraulic diameter and the bleed holes on the leading surface of the channel. The hole diameter of bleed hole is 4.5mm and its spacing is ( p/d:4.9) about five times of hole diameter. Exit mass flow rate through bleed holes is $10\%$ of the main mass flow rate and relation number is changed form 0.0 to 0.4. A naphthalene sublimation technique is employed to determine the detailed local heat transfer coefficients using the heat and mass transfer analogy The cooling performance is influenced by exit mass flow rate through bleed holes and Coriolis force of rotating channel for fixed Reynolds number. The heat transfer on the leading surface is decreased due to Coriolis force. However the total heat transfer is enhanced around holes on the leading surface because of trapping flow by bleeding.
Keywords
Bleed hole; Coriolis force; Naphthalene sublimation technique; Rotating duct;
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  • Reference
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