抄録
Boundary flow conditions at an interface between two fluids has been interested in many engineering fields relating to heat and mass transfer phenomena. Authors succeeded in measuring flows adjacent to the interface between a water-bubble and surrounding oil. Since the refraction index of water is less than that of the silicone oil, the inside region of the water bubble can be observed up to the very vicinity of the interface. PTV technique is applied to the measurement. The measuring results dearly show that the flows slip at the boundary and the velocities at both side of the dean interface are coincide with each other. The velocity gradient at each side of the boundary is different on the contrary
