Augmentation Mechanism of Forced-Convection Heat Transfer by Applying Electric Fields in the Restricted Region near the Wall

Augmentation Mechanism of Forced-Convection Heat Transfer by Applying Electric Fields in the Restricted Region near the Wall

By applying electric fields using the array of wire electrodes installed near the heat transfer wall along the main stream, in the range of low Reynolds number, the heat transfer coefficients of liquid were augmented to the same order as that in turbulent flow, and the pressure drop was increased bu...

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Veröffentlicht in:Nihon Kikai Gakkai rombunshuu. B hen 1995/05/25, Vol.61(585), pp.1775-1781
Hauptverfasser: Yabe, Akira, Adachi, Masaki, Katayama, Ryu, Nariai, Hideki
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Sprache:eng ; jpn
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Forced-Convection of Liquid
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container_end_page 1781
container_issue 585
container_start_page 1775
container_title Nihon Kikai Gakkai rombunshuu. B hen
container_volume 61
creator Yabe, Akira
Adachi, Masaki
Katayama, Ryu
Nariai, Hideki
description By applying electric fields using the array of wire electrodes installed near the heat transfer wall along the main stream, in the range of low Reynolds number, the heat transfer coefficients of liquid were augmented to the same order as that in turbulent flow, and the pressure drop was increased but still remained on the same order as that in laminar flow. It was clarified that the ratio of Colburn's J factor to the friction factor for evaluating the performance became 4.4 times for Re = 1470 and 1.9 times for Re = 20000 with the electric field of 10 kV/cm. Furthermore, by analyzing the power spectrum of the flow velocity and electric current, the peak regions around 1 Hz were found to be increased by applying electric fields, which means the fluctuation of negative ion flow emitted from the cathode, as clarified by the voltage-current characteristics of the electrostatic probe in the higher-potential region.
doi_str_mv 10.1299/kikaib.61.1775
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language eng ; jpn
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subjects Forced-Convection of Liquid
title Augmentation Mechanism of Forced-Convection Heat Transfer by Applying Electric Fields in the Restricted Region near the Wall
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