Abstract
A system was developed to visualize the internal flow in the open impeller of a volute pump by photographing with slit lighting of stroboflash. The flow was visualized by the added tracer particles of polystyrene beads having mean diameter of 1mm. With this, velocity distribution relative to the impeller and secondary flow between the impeller blades can be observed by use of still camera mounted on the disc which rotates synchronizing with the impeller. And color slit lighting of strobof lash brought a 3-dimentional visualization of the internal flow by the aid of an image-processing method in emphasizing the intensity of color of each trace on the original picture.
