CIESC Journal ›› 2010, Vol. 61 ›› Issue (9): 2217-2224.
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FAN Yiping,E Chenglin,LU Chunxi,GAO Jinsen,XU Chunming,SHI Mingxian
Online:
Published:
范怡平,鄂承林,卢春喜,高金森,徐春明,时铭显
Abstract:
Gas/liquid-solid two-phase flow is ubiquitous in chemical engineering.This paper theoretically and experimentally analyzes the mass conservation of solid phase in a CFB riser.It is revealed that the time-average particle velocity and arithmetical-average particle velocity are misused in the traditional viewpoint of two-phase flow.The introduction of solid volume fraction in a two-phase flow actually denotes an assumption that the discrete particles are treated as a continuum.Then the misuse of time-average particle velocity and arithmetical-averaging appears inevitable.The physical meaning of time-average particle velocity in a gas/liquid-solid two-phase flow is discussed on a microcosmic scale.An equation for computing the time-average particle velocity in a discrete two-phase flow is given.Furthermore,a proper approach is proposed to analyze the mass conservation of discrete particles.
Key words: 两相流, 颗粒速度, 质量守恒, 时间平均, 算术平均
两相流,
摘要:
通过实验研究和理论分析,考察了提升管中颗粒相的质量守恒;发现在传统的两相流研究中,对颗粒速度的时间平均和算术平均存在着误用。在传统理论中,由于引入了颗粒相的体积分率项,实际上是对离散的颗粒进行了连续化的假设。由此不可避免地造成颗粒速度时间平均和算术平均的混淆。在微观尺度上对气/液-固两相流中颗粒速度时间平均的物理意义进行了分析,给出了计算非连续流场中颗粒时均速度的表达式,并提出了分析颗粒相质量守恒的方法。
关键词: 两相流, 颗粒速度, 质量守恒, 时间平均, 算术平均
FAN Yiping, E Chenglin, LU Chunxi, GAO Jinsen, XU Chunming, SHI Mingxian. Particle velocity in gas/liquid-solid two-phase flow[J]. CIESC Journal, 2010, 61(9): 2217-2224.
范怡平, 鄂承林, 卢春喜, 高金森, 徐春明, 时铭显. 气/液-固两相流中的粒子速度 [J]. 化工学报, 2010, 61(9): 2217-2224.
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Numerical simulation of gas-particle two-phase flow in impinging streams gasifier
RADIAL DISTRIBUTION CHARACTERISTICS OF LOCAL PARTICLE VELOCITY FOR BINARY PARTICLE MIXTURE IN DOWNERS