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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v7.i6.40
pages 411-425

Heat Transfer Enhancement of Airflow in a Channel Using Corona Discharge

Majid Molki
Department of Mechanical and Industrial Engineering Southern Illinois University Edwardsville, Edwardsville, Illinois 62026
Michael M. Ohadi
Small and Smart Thermal Systems Laboratory, Center for Energy Environmental Engineering, Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA
B. Baumgarten
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
M. Hasegawa
Mechanical Engineering Laboratory, AIST, MITI, 1-2 Namiki, Tsukuba 305-8564, Japan
Akira Yabe
Mechanical Engineering Laboratory, Ministry of International Trade and Industry, 1-2 Namiki, Tsukuba, Ibaraki 305 Japan

ABSTRACT

A numerical and experimental investigation was performed to study the effect of corona discharge on the flow field and heat transfer enhancement of airflow in a channel. The electric field was applied via a charged electrode situated at the centerline along the channel axis. The numerical approach was based on the Large-Eddy Simulation turbulence model to investigate the potential turbulence generated by the electric field and was applied to the fully-developed region. The experiments were performed in an earlier study and represent the data available to compare with the present computations. Thermal boundary condition was the uniform wall heat flux. In both numerical and experimental approaches, Reynolds number ranged from 500 to 2000, corona current 0.059 to 2.420 mA/m, and applied voltage −5.655 to −6.900 kV. The numerical results revealed the secondary flows in the cross-section of the channel. This corona-induced secondary flow was the main mechanism behind the enhanced heat transfer coefficients in both fully-developed and developing regions of the channel. The maximum heat transfer enhancement in the fully-developed flow was Nu/Nu0 = 3.4 for Re = 500−2000, while that in the developing flow was much smaller and ranged from 1.56 to 2.01.


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