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Title :後向きステップ流れ場の受動的・能動的伝熱促進の熱的性能評価
Title alternative :Evaluation of Thermal Performance on Heat Transfer Enhancement by Passive and Active Methods at Downstream Region of Backward-Facing Step
Authors :親川, 兼勇
照屋, 功
瀬名波, 出
屋我, 実
馬淵, 幾夫
Authors alternative :Oyakawa, Kenyu
Teruya, Isao
Senaha, Izuru
Yaga, Minoru
Mabuchi, Ikuo
Issue Date :25-Mar-1996
Abstract :The heat transfer coefficients and the pressure distributions were measured downstream of the backward facing step in which the heat transfer was actively or passively enhanced by following procedure. (1)The jet was ejected perpendicularly to the main flow from the portion on the opposite wall of the step. (2) The air flow was sucked from the recirculating zone. (3) A slat was inserted with an inclination to the main flow. These cause the main flow to curve sharply, and then the recirculating zone to shorten, so it is easy to control the lengths of the reattachment point, and consequently, the heat transfer. The thermal performance, η defined as the ratio of the heat transfer coefficient at the recirculating region with these modifications to that of a normal region, was calculated for equivalent pumping power, and it was found that η was larger than unity for the enhanced systems, except in the case of the discharge jet. It is effective to apply the enhancement of the heat transfer by active or passive methods to the suddenly expanding tunnel.
Type Local :雑誌掲載論文
ISSN :03875016
Publisher :日本機械学会
URI :http://hdl.handle.net/20.500.12000/128
Citation :日本機械学会論文集. B編 = Transactions of the Japan Society of Mechanical Engineers. B Vol.62 no.595 p.272 -278
Appears in Collections:Peer-reviewed Journal Articles (Faculty of Engineering)

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