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. As the fluid near the wall is cooled in the heat exchanging process, the drag reduction range is shrunk for the high temperature conditions. Therefore, decrease of the heat transfer can be prevented in heat exchangers.
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