喷嘴与水平圆管的气－液两相流动阻力特性

本文应用一维变密度气－液两相流动量方程于喷嘴和水平圆管的气水两相流动，建立了喷嘴进出口压力及流速之间的关系，将动量方程在有限管道长度内积分，从而可由试验测得的压力差计算通过水平回管的气－液两相流阻力系数，并在大量试验的基础上建立了考虑截面含气率的喷嘴动量修正系数的相关关系式和水平因管中气水两相流阻力系数与雷诺数之间的关系式。

Wall Friction Characteristics of Gas-liquid Mixture Flow through Nozzle and Horizontal Pipelines

In this paper, gas-liquid mixture flows through convergent and abrupt contracting nozzles and horizontal pipeline are analyst by using one-dimensions momentum halsnce approach considering the variation of mixture density with pressure. The dependence of mixture velocity at nozzle outlet on the pressure differential over nozzle has beed obtained. By integlating momentum equation over pipeline of a given length, the friction factor due to gas-liquid mixture flow is determined form pressure difference otherved. Experimental investigstion was undertaken is given to the influence of the pipeline entry geometry. Two type of pipeline entry geometry was tested. It has been found that the geometry of pipeline entry has significant influence on the flow pattern in pipeline and the friction factor due to gas-liquid two phase flow. Based on experimental data,momentum modification coefficient of nozzle is correlated with void fraction, and the wall friction factor subject to gas-liquid flow through horizontal pipeline with convergent and abrupt contraction entry is correclated with Renolds Number and compered with the data reported by other researcher.