TY - GEN

T1 - Entrainment due to mean flow in two-layered fluid

AU - Ura, Masaru

AU - Matsunaga, Nobuhiro

PY - 1988

Y1 - 1988

N2 - 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.

AB - 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.

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M3 - Conference contribution

AN - SCOPUS:0024169716

SN - 0872626873

T3 - Twenty First Costal Eng Conf

SP - 2550

EP - 2560

BT - Twenty First Costal Eng Conf

PB - Publ by ASCE

T2 - Twenty-First Coastal Engineering Conference

Y2 - 20 June 1988 through 25 June 1988

ER -