EFFECT OF SIDE WALL ON PARTICLE-FLUID MOTIONS IN PARTICLE-LADEN OPEN-CHANNEL FLOW

Abstract

Simultaneous measurements of particle-laden flow have been investigated extensively. It is very difficult to measure such a two-phase flow when the particle concentration is relatively large. It is because the particles between the measuring volume and CCD device are the obstacles. Mean flow properties and turbulence characteristics of high particle concentration flow may be changed greatly than dilute flow. In this study, some experiments conducted in narrow open-channel flow enabled us to measure high particle-concentration flow. It was found that the flow field in the near-wall region (y/h<0.2) was not affected significantly by secondary current and that 2-D turbulent flow was obtained. Consequently, universal characteristics in the near-wall region are expected to clarify particle-fluids motions even in narrow open-channel flow.