Turbulent Structures and Heat Transfer Across the Air-liquid Interface in the Wind-driven Turbulent Flow

Abstract

In this study, investigation of the turbulent structures and heat transfer across the air-liquid interface was conducted by DNS data of wind-driven turbulent flow. The streamwise dynamic process, which was the interaction between coherent turbulent structures in gas layer and large horizontal scale shaped the water surface waves, dominated momentum and heat transfer across the air-liquid interface. On the other hand, wall-normal transfer was inactive under the vertical turbulent restraint effects of the water surfaces similar with the turbulent open-channel flows at low Froude number on the turbulent motion. Thermal boundary condition was almost constant temperature condition at the air-liquid interface, because temperature fluctuations were caused from surface waves as well as wall-normal turbulent intensity.