Cross Flow Through Closely-Arranged, Stagaered-Array Tube Banks

Cross Flow Through Closely-Arranged, Stagaered-Array Tube Banks

Prevention of vibration and acoustic resonance, originating in cross flow through the tube banks is important for a heat exchanger such as boiler. This paper is concerned with the excitation mechanism of velocity fluctuation in the tube banks which are arranged closely together. We measured the volo...

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Veröffentlicht in:Nihon Kikai Gakkai rombunshuu. B hen 1998/11/25, Vol.64(627), pp.3590-3596
Hauptverfasser: OHTOU, Hiroaki, AYUKAWA, Kyozo, OCHI, Junji, KAWAHARA, Genta, SOGO, Motosuke
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Sprache:eng ; jpn
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Vortex Shedding
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container_end_page 3596
container_issue 627
container_start_page 3590
container_title Nihon Kikai Gakkai rombunshuu. B hen
container_volume 64
creator OHTOU, Hiroaki
AYUKAWA, Kyozo
OCHI, Junji
KAWAHARA, Genta
SOGO, Motosuke
description Prevention of vibration and acoustic resonance, originating in cross flow through the tube banks is important for a heat exchanger such as boiler. This paper is concerned with the excitation mechanism of velocity fluctuation in the tube banks which are arranged closely together. We measured the volocity fluctuation in a closely staggered arrangement. The ratio of Ion-gitudinal pitch to rod diameter of this arrangement was varied in a range of L/D=1.1 to 1.5, while the traverse spacing ratio is fixed at T/D=2.0. The range of Reynolds number is from 0.33×104 to 6.6×104. There are three dominant frequencies in the flow, caused by the different mechanisms : the fluctuation of flux which are flow rate fluctuations due to periodical change in the reattaching point, the change of the flow pattern in the separation region and the vortex shedding. The fluctuation of flux and the change of flow pattern have strong influence on the flow, and dominance in the two mechanisms changes with Reynolds number and the longitudinal spacing ratio.
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese
subjects Vortex Shedding
title Cross Flow Through Closely-Arranged, Stagaered-Array Tube Banks
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