TURBULENCE STRUCTURE IN OPEN CHANNEL FLOWS WITH FAVORABLE PRESSURE GRADIENTS

• NEZU Iehisa

  JAPAN SOCIETY OF CIVIL ENGINEERS

• ONITSUKA Kouki

  JAPAN SOCIETY OF CIVIL ENGINEERS

• FUJITA Masaki

  JAPAN SOCIETY OF CIVIL ENGINEERS

Bibliographic Information

Other Title

• 開水路加速流の乱流特性に関する実験的研究
• カイスイロ カソクリュウ ノ ランリュウ トクセイ ニ カンスル ジッケンテキ ケンキュウ

Abstract

Flow fields of open channel flows with favorable pressure gradients (dp/dx<0) were measured accurately with a laser Doppler anemometer (LDA) and distal-type point gage. The mean velocity profiles of the inner-region and outer-region can not be expressed by the standard log law. However, the mean velocity profiles in the viscous sublayer can be expressed well by the linear formula. Therefore, the evaluation of the friction velocity U by making use of such a linear formula is the most reliable. It should be noted that the turbulent energy is transported back from the turbulence to the mean velocity. Consequently, the turbulent redistribution changes as compared with that of an uniform flow, i. e. non-pressure gradient flow.

Journal

• Doboku Gakkai Ronbunshu

  Doboku Gakkai Ronbunshu 2000 (642), 57-66, 2000-02-21

  Japan Society of Civil Engineers

Keywords

• open channel flow
• turbulence
• favorable pressure gradient
• Reynolds stress
• LDA

Details

• CRID: 1390001205308734592
• NII Article ID: 130003983469
• NII Article ID: 10004541356
• NII Book ID: AN10014020
• DOI: 10.2208/jscej.2000.642_57
• ISSN: 18827187
• ISSN: 02897806
• NDL BIB ID: 5292865
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5292865
• Web Site: https://www.jstage.jst.go.jp/article/jscej1984/2000/642/2000_642_57/_pdf
• Data Source:
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  • NDL
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  • CiNii Articles
• Abstract License Flag: Disallowed