任何流体（气体或液体）由于分子运动，其内部的浓度是均匀的。但当流体与另一液体或固体接触时，根据边界层理论，它的分子向相界面扩散受到阻力，界面上物质的浓度和流体内部的浓度有较大差异。这就是界面浓度的产生。
研究发现在一定油相折算速度条件下，随水相折算速度的增大，局部相界面浓度有先递减，而后逐渐增大的变化趋势。
This can be explained that for lower water flow rates, the decrease of the interfacial area concentration was caused by the sharp decrease of the oil phase fraction with increasing water flow rates.
还发现，内相中氢氧化钠的浓度对两相界面张力也有影响。
The relation between the interface tension and the encapsulated phase NaOH concentration is discovered too.
用流动法测定了大豆蛋白质在气液界面上的表面过剩浓度并回归了线性吸附方程。
Furthermore, surface excess concentration of soybean protein at gas liquid interface was measured by fluid method.
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