The Effects of Surfactants on Breaking Wind Waves

已经观察到，气体通过海-气界面的传输速率与高频表面波的均方斜率有很好的相关性。 人们还注意到，表面活性剂的存在，在浓度几乎没有影响的表面张力，显着减少了风波谱的高频分量。 波浪水槽研究的风浪，风浪加上机械产生的波浪，有和没有可溶性表面活性剂，将寻求了解的机制，这种减少均方斜率的表面活性剂的存在下，以及高频波的特性。 在低浓度下，假设这种效应可能是由于表面活性剂在波峰处的浓缩，在波峰处毛细效应通常最大。 将使用各种实验室测量技术。 推车以与波相位相称的速度沿波槽沿着携带测量装置。 二次谐波发生技术允许动态测量表面活性剂浓度。 对于后面的研究，该系统将位于固定位置并随机对海浪进行采样。

0221335 DuncanIt has been observed that the rate of gas transfer across the air-sea interface correlates well with the mean squared slope of the high frequency surface waves. It has also been noted that the presence of surfactants, at concentrations that have almost no effect on surface tension, dramatically reduces the high frequency components of the wind wave spectrum. Wave tank studies of wind waves, and wind waves plus mechanically generated waves, with and without soluble surfactants, will seek to understand the mechanisms for this reduction in mean squared slope in the presence of surfactants, as well as the characteristics of high frequency waves. At low concentrations, it is hypothesized that the effects may result from the concentrating of surfactants at the wave crests, where capillary effects are typically largest. A variety of laboratory measurement techniques will be used. A cart carries measurement devices along the wave tank at speeds commensurate with the wave phase. Second Harmonic Generation techniques allow dynamic measurement of surfactant concentration. For these latter studies, the system will be at a fixed location and randomly sample the wind waves.