Impact of spray droplets on momentum and heat transport in a turbulent marine atmospheric boundary layer

Ming Pan; Caixi Liu; Qingxiang Li; Shuai Tang; Lian Shen; Yuhong Dong

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Impact of spray droplets on momentum and heat transport in a turbulent marine atmospheric boundary layer

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Droplet-laden turbulent airflow(i.e. the mixture of dry air and water vapor) in the marine atmospheric boundary layer is described by an open channel flow configuration in direct numerical simulation(DNS). The dispersed phase, the spray droplets are tracked in a Lagrangian framework, and their impact on the carrier airflow is modeled with the two-way coupling between the two phases. A wide-range droplet size is typically found near the air–sea interface according to the sea spray concentration function(SSCF). The interactions of the droplets with turbulent airflow including mass, momentum, and energy exchange are investigated here. We found a balancing mechanism exists in the droplet effects on the turbulent drag coefficient, since spray droplets lead to a decreased vertical turbulent momentum transport, but also lead to an increased droplet contribution to total drag coefficient. For the heat transfer, as droplet mass loading increasing, the total Nusselt number decreases due to the depression of turbulent heat flux and enhanced negative droplet convective flux.

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《力学快报：英文版》 |2019年第2期|71-78|共8页
作者
Ming Pan; Caixi Liu; Qingxiang Li; Shuai Tang; Lian Shen; Yuhong Dong;
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作者单位

Shanghai Institute of Applied Mathematics and Mechanics;

Shanghai University;

Department of Mechanical Engineering;

and St.Anthony Falls Laboratory;

University of Minnesota;

Shanghai Key Laboratory of Mechanics in Energy and Environment Engineering;

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原文格式 PDF
正文语种 chi
中图分类力学;
关键词
Direct; numerical; simulation; Air-sea; interface; Sea; spray; Turbulent; airflow;

Impact of spray droplets on momentum and heat transport in a turbulent marine atmospheric boundary layer

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