Einfluß von Tensiden auf Strömung und Stoffübergang in einer flüssig/flüssig‐Kanalströmung

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Abstract
Measurement of flow and mass transfer were performed in a two‐phase liquid/liquid‐channel arrangement in absence and presence of soluble surface active substances (Sodium‐dodecylsulfate).—Laser‐Doppler‐velocimetry was used to measure interfacial velocities and velocity profiles perpendicular to the interface in the water and in the solvent phase. Mass transfer measurements are related to the transfer of aceton across the plane interface between water and carbontetrachloride. It is shown that below the critical micell concentration (cmc) an almost rigid interface is formed with a highly suppressed mass transfer, near the cmc an increase of mass transfer and interfacial velocities was observed, and above the cmc mass transfer behaviour and interfacial flow is corresponding to an absolutely clean interface.—The compression of the surfactant layer was calculated applying the equation for Newtonian shear stress on the measured flow profiles. The resulting gradients of interfacial pressure are in good agreement with the interfacial pressures, calculated on the basis of the so‐called “cmc‐effect”.