The Variation of the Gas Transfer Coefficient with Molecular Diffusity
The Variation of the Gas Transfer Coefficient with Molecular Diffusity
复制标题
气体传递系数随分子扩散度的变化
DOI：
--
复制
发表时间：
1984
期刊：
影响因子：
--
通讯作者：
James J. Ledwell
中科院分区：
文献类型：
--
作者：
James J. Ledwell
我们认为，对于微溶气体，空气-水界面的边界条件导致传递系数随分子扩散率的1/2幂变化。对于风力驱动的水体，传递系数应随施密特数的-1/2次幂和由粘性传递的风应力部分的1/2次幂而变化。将边界条件与光滑壁面上的边界条件进行了对比，光滑壁面上的传质系数随施密特数的-2/3次方变化。在一个18米的风洞中测量的N2 O，CH 4，和他在中等风应力的传输系数支持我们的论点。
We argue that the boundary conditions at the air-water interface lead to a variation of the transfer coefficient with the 1/2 power of the molecular diffusivity for slightly soluble gases. For wind-driven bodies of water the transfer coefficient should vary with the −1/2 power of the Schmidt number and with the 1/2 power of that part of the wind stress transmitted by viscosity. The boundary conditions are contrasted with those at a smooth wall where the mass transfer coefficient varies with the –2/3 power of the Schmidt number. Measurements of the transfer coefficient for N2O, CH4, and He at moderate wind stress in an 18 meter wind-wave tunnel support our arguments.