FLOW IN A SPIRAL TUBE (2ND REPORT, HYDRAULIC TRANSPORT OF SOLIDS IN A HORIZONTAL PIPE).

Abstract

The drag reduction in a hydraulic transport of solids in a horizontal pipe has been studied experimentally by a spiral tube with three-shaped groove tube walls. The reductions of the pressure loss and critical velocity are obtained, and the experimental formula for the pressure losses has been given by referring to Durand's formula. The difference between the flow behavior of the solid-liquid mixture in the spiral and that in the straight pipe, is shown by the results of flow visualization and measurement of the solid particle concentration.