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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Determination of the loss coefficient of elbows in the flow of low-density spherical capsule train
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Determination of the loss coefficient of elbows in the flow of low-density spherical capsule train

机译：低密度球形胶囊列车流动中肘部损失系数的确定

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摘要

Design parameters of a pipelines capsule flow can be calculated if dependence of pressure drops on flow velocity and capsule concentration of such pipelines are known. For this purpose, loss coefficients of elbows were studied experimentally in pipeline loop of I.D. 0.1 m. Elbows with central angles of 90 degrees and 45 degrees made of PVC were used for low-density spherical capsule train flow. The outer diameter and relative density of the capsules were 0.08 m and 0.87, respectively; the pressure drops were measured at Reynolds number range 2 x 10(4)< Re < 1 x 10(5) and for a transport concentration from 5% to 25%. Increments of the pressure gradient become larger at higher velocities and solid phase concentrations. The pressure gradients that occurred at the 90 degrees elbow were higher than that occurred at the 45 degrees elbow. Loss coefficient of the 90 degrees elbow for the same flow velocity and capsule concentration in the capsules-water mixture flow is from 3 to 2 times higher than the loss coefficient at the 45 degrees elbow. (c) 2007 Elsevier Inc. All rights reserved.
机译：如果已知压力降对此类管道的流速和胶囊浓度的依赖性，则可以计算管道胶囊流量的设计参数。为此目的，在I.D.的管道回路中对弯头的损耗系数进行了实验研究。 0.1米低密度球形胶囊列流使用90度和45度中心角的PVC制成的弯头。胶囊的外径和相对密度分别为0.08 m和0.87;在雷诺数范围2 x 10（4）

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