抄録
Flows inside a water drop sinking in oil are measured combining new visualization techniques and a PTV technique. The flows have been interested in the relation to the heat and mass transfer phenomena across an interface between two fluids. This study aimed to measure the flow conditions, velocity distributions, in the interface region of a drop, and to correlate the fluid resistances to the quantitative flow conditions.
In order to apply the PTV to the flow measurements, some problems associated with the visualization of the inside area of a water drop have to be resolved. The authors have developed new visualization techniques, which are able to correct the image distortion caused by a spherical surface of a water drop, and able to obtain distinct outline of the drop. It is confirmed that the measured velocity distributions exhibit good correlations to the changes in the drag coefficients of the drops.
