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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v13.i1.30
pages 39-52

Enhanced Heat Transfer in a Solar Air Heater with Double-Flow Configuration by Electrohydrodynamic Technique

Nat Kasayapanand
School of Energy and Materials, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand
Tanongkiat Kiatsiriroat
Department of Mechanical Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Nat Vorayos
Department of Mechanical Engineering, Chiang Mai University, Chiang Mai 50200, Thailand

ABSTRAKT

Thermal characteristics of laminar forced convection inside solar flat-plate air heaters with double-flow configuration using the electrohydrodynamic technique are examined numerically. The electric field is generated by the wire electrodes with different arrangements charged with DC high voltage ranging from 7.5 to 17.5 kV. The numerical modeling of computational fluid dynamics includes the interactions between the electric field, flow field, and temperature field. It is found that the enhancement of heat transfer in the presence of the electric field increases in relation with the supplied voltage but decreases when the Reynolds number is augmented. The heat transfer enhancement is also depended on the total heat flux at an absorbing plate, the number of electrodes, and the channel geometry.


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