平滑な気液界面における界面スリップの測定(流体工学,流体機械)

抄録

Most of interface tracking simulations conducted so far have been based on the assumption that the gas velocity is equal to the liquid velocity on gas-liquid interfaces. To the contrary, the theory of jump conditions presented by Ishii and Delhaye implies that an interfacial slip would exist when interfacial entropy generation takes place. In the present study, we therefore measured velocity distributions in the vicinity of a flat gas-liquid interface using an LDV system with a high spatial resolution of about 10 μm to examine whether or not the interface slip exist. To accurately measure the interface position, we utilized a secondary measurement volume formed by beams reflected by the interface. As a result, we could confirm that the interface slip does exist and its magnitude is large where the interfacial shear stress is large, i.e. where a large interfacial momentum transfer takes place.