Abstract
The characteristics of heat transfer and drag reduction of turbulent water flow with surfactant have been investigated based on the coherent fine scale eddy in near-wall turbulence. To analyze the heat transfer and drag reduction, time scale ratio of surfactant to coherent fine scale eddy has been introduced. This time scale ratio characterizes the range of drag and heat transfer reduction, simultaneously. With the modification of time scale of the coherent fine scale eddy, the range of the drag reduction for heat exchanging cases agree with those for no heat exchanging cases.
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