The effect of large-scale roughness in promoting gas absorption
The effect of large-scale roughness in promoting gas absorption
复制标题
大尺度粗糙度对气体吸收的促进作用
DOI：
10.1016/0009-2509(69)80032-1
复制
发表时间：
1969
影响因子：
4.7
通讯作者：
K. V. Warner
中科院分区：
文献类型：
--
作者：
J. Davies;K. V. Warner
当水流过大尺度粗糙度的平板时，其吸收CO2的速率比流过光滑平板时快3.5倍。当粗糙度为引起流动水中“尾流干扰”振荡的形式时，气体吸收最快.结果与现有理论作了比较：各向同性湍流的Levich理论相当好地预测了kL随Re和sm γ'的变化，但测量的KL值比计算值高出约10倍.对CO_2、H_2和He的实验结果比较表明，kL与分子扩散系数的0·5次方密切相关。
The rate of absorption of CO2into water flowing over a plate on which there is large-scale roughness can be up to 3·5 times faster than into water over a smooth plate. The gas absorption is fastest when the roughness is of a form which induces “wake-interference” oscillations in the flowing water.Results are compared with current theories: the Levich theory for isotropic turbulence predicts fairly well the observed variations ofkLwithReand sm γ' but the measuredKLfigures are about ten times higher than the numerical values calculated. Evidently the surface renewal is much more effective than in isotropic turbulence.Comparison of results for CO2, H2and He indicates thatkLvaries closely as the 0·5 power of molecular diffusivity.