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Surfactant effects on passive scalar transport in a fully developed turbulent flow

机译:表面活性剂对充分发展的湍流中被动标量传输的影响

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摘要

Direct numerical simulations of fully developed turbulence in an open channel were performed. Effects of surfactants on heat transfer and the underlying turbulent structures were investigated. As surface elasticity is increased turbulent fluctuations are damped and the mean surface temperature is decreased. A surface strain model is introduced to explain this behavior in a heuristic manner. A nondimensional parameter representing the ratio of surface elastic forces to local inertial forces is introduced. It is concluded that for values of the parameter of order one, surfactants have strong effects on surface turbulence, whereas an effectively clean surface can be obtained for parameter values less than O(10~(-3)).
机译:在明渠中进行了充分发展的湍流的直接数值模拟。研究了表面活性剂对热传递和底层湍流结构的影响。随着表面弹性的增加,湍流波动得到抑制,平均表面温度降低。引入表面应变模型以启发式方式解释此行为。引入了表示表面弹性力与局部惯性力之比的无量纲参数。结论是:对于一阶参数值,表面活性剂对表面湍流具有强烈影响,而对于小于O(10〜(-3))的参数值,可以获得有效清洁的表面。

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