Abstract
In the application of the Toms' effect to hydraulic transportation of solids in pipelines, it is a very important problem to evaluate the pressure loss in pipe bends.In this paper we describe an experimental study of the pressure loss in a vertical pipe bend flow. The fluids used in this test are fresh water, PEO solution, sand-water mixture and sand-water-PEO mixture. The radii of curvature of 90° pipe bend are 70mm and 140mm. The straight pipe connected with these bends has an internal diameter of 25mm.The results obtained are summarized as follows:(1) The distance, which is necessary before the pressure gradient in downstream of the bend becomes constant, for the mixture flows dissolved PEO was longer than that for the mixture flows not dissolved PEO.(2) An empirical equation for the bend-loss coefficient of the PEO solutions was obtained as Eq.(6).(3) The correlations on the additional bend-loss coefficient of the sand-water mixture flows were obtained as Eq.(21) and Eq.(24), and those of the sand-water-PEO mixture flows were obtained as Eq.(23) and Eq.(24).
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