A Technique to Measure the Flow Velocity by an Analysis of Tracer Pathline Images

Abstract

Tracer pathline images of flow field give us a great deal of information about the field and several methods were developed to obtain the velocity vectors from these pictures. In this paper, a new technique is proposed in order to obtain the velocity vectors from the picture of flow fields. The picture which contains long-time exposed tracer images is treated as an unintentional movement of a camera in taking the picture and the restoring method which makes multi-time exposed picture clear is introduced. A flow pattern is analysed and the results show that the technique is simple and useful to analyse the pathline images.