Entrainment due to mean flow in two-layered fluid

Masaru Ura, Nobuhiro Matsunaga

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    The entrainment phenomena have been investigated across an interface between two-layered stratified flow induced by wind shear stress. The velocities of mean flow, turbulence and entrainment have been measured under three different conditions of water surface by using a wind-wave tank. When the entrainment velocity ue is expressed on the basis of the turbulent quantities at the interface, the turbulent entrainment coefficient is expressed, in an equation given in the paper, interms of effective byoyancy, turbulence intensity and integral lengthscale of turbulence at the interface. The result coincides with the relationship of entrainment due to oscillating grid turbulence, in which the mean flow does not exist. When, for practical purposes, the estimation of ue is made by using the mean velocity and the depth of mixed layer, another expression, also given in the paper, is derived.

    Original languageEnglish
    Title of host publicationTwenty First Costal Eng Conf
    PublisherPubl by ASCE
    Number of pages11
    ISBN (Print)0872626873
    Publication statusPublished - 1988
    EventTwenty-First Coastal Engineering Conference - Costa del Sol, Malaga, Spain
    Duration: Jun 20 1988Jun 25 1988

    Publication series

    NameTwenty First Costal Eng Conf


    OtherTwenty-First Coastal Engineering Conference
    CityCosta del Sol, Malaga, Spain

    All Science Journal Classification (ASJC) codes

    • General Engineering


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