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 Based on a new method to produce fluid ice,water atomization in immiscible oil flow is simulated numerically in this paper.A set of threedimensional transient conservation equations of mass and momentum are established by taking surface tension and gravitational force effects into consideration.The governing equations are solved by using Pressure Implicit Splitting Operators(PISO) algorithm.The volumeoffluid(VOF) method in conjunction with the multidimensional piecewise linear interface construction(PLIC)... Based on a new method to produce fluid ice,water atomization in immiscible oil flow is simulated numerically in this paper.A set of threedimensional transient conservation equations of mass and momentum are established by taking surface tension and gravitational force effects into consideration.The governing equations are solved by using Pressure Implicit Splitting Operators(PISO) algorithm.The volumeoffluid(VOF) method in conjunction with the multidimensional piecewise linear interface construction(PLIC) is applied to characterize the behavior of wateroil interface movement.The flow phenomena in different working conditions are researched.The results of simulation show that the average atomization diameter of water droplets increases with the velocity of water and decreases with the velocity of oil,and it increases with the diameter of atomization pipe.  基于一种制取流体冰的新方法,对水在流动的互不相溶的油介质中的雾化机理进行了三维数值模拟,求解连续性方程和动量守恒方程并考虑重力及表面张力的影响,对压力速度耦合采用PISO(Pressure Implicit Splitting Operators)算法,利用VOF(Volum e of Flu id)方法中的PLIC(P iecew ise L inear Interface Construction)技术追踪水与油介质之间的移动界面,模拟多种情况下的流动状况,分析了水在喷口处的流速、油的入口流速以及喷口直径对于雾化水滴大小的影响.模拟结果表明,雾化形成的水滴平均直径随水在喷口处的流速增加而增大,随油的入口流速的增加而减小;喷口直径越大,水滴的平均直径越大.  The particle diameter distribution of liquid droplets is one of the key factors involved in the technology for making fluid ice from a liquidliquid circulating fluidized bed. On a fluidized bed test device, by using a method combining high speed photography with image processing, a study has been conducted of the liquidliquid singlehole atomized jetflow at a low flowing speed and its impact on the distribution of particle diameters of liquid droplets. In this connection, a mathematicostatistical method... The particle diameter distribution of liquid droplets is one of the key factors involved in the technology for making fluid ice from a liquidliquid circulating fluidized bed. On a fluidized bed test device, by using a method combining high speed photography with image processing, a study has been conducted of the liquidliquid singlehole atomized jetflow at a low flowing speed and its impact on the distribution of particle diameters of liquid droplets. In this connection, a mathematicostatistical method was employed to analyze the change in jet flow length and the distribution of particle diameters of liquid droplets. It has been found from the analysis that a jet flow emerges when its speed is greater than 1.14 m/s and the fluctuations in the jet flow length at various flow speeds assume a random and nonperiodic character. Moreover, with an increase of the jet flow speed the mean value and variance of the jet flow length show an overall variation tendency of “first increase and then decrease". With the jet flow speed being 6.58 m/s, which is a turning point, a spherical or conical jetflow top is formed at the peak point of the jet flow length fluctuations. This is the main reason why there emerged a difference in magnitude of the particle diameters of liquid droplets and their movement routes showed signs of wobbling. At various flow speeds, the distribution of particle diameters of the liquid droplets is in very good agreement with RosinRammler distribution. The research results provide a reliable basis for controlling the distribution of particle diameters of liquid droplets resulting from atomization during the actual operation of a liquidliquid circulating fluidized bed.  液滴的粒径分布是液液循环流化床制取流体冰技术的关键因素之一。在流化床实验装置上,采用快速摄像与图像处理相结合的方法,研究低流速下液液单孔雾化的射流及其对液滴粒径分布的影响,射流长度的变化和液滴的粒径分布运用数学统计的方法进行分析。研究结果发现,当射流速度大于1.14m/s时,开始出现射流;各个流速工况下射流长度的波动具有随机和非周期的特点,其均值与方差随射流速度增大的总体变化趋势是先增大后减小;转折点在射流速度为6.58m/s时,在射流长度波动的峰点处形成球形或锥形射流顶部是液滴的粒径具有大小差异及其运动路径发生摆动的主要原因;各流速工况下,液滴的粒径分布与RosinRammler分布符合的很好;研究结果为液液循环流化床实际运行时控制雾化形成液滴的粒径分布提供可靠依据。  >=Based on a new method to produce fluid ice, water atomization in immiscible oil is simulated numerically in this paper. A set of transient conservation equations of mass and momentum with the consideration of surface tension and gravitational force effects are established. The volumeoffiuid (VOF) method in conjunction is applied to characterize the behavior of wateroil interface movement. The relations between the average size of droplets, the velocity of water and the equivalent diameter of the spout... >=Based on a new method to produce fluid ice, water atomization in immiscible oil is simulated numerically in this paper. A set of transient conservation equations of mass and momentum with the consideration of surface tension and gravitational force effects are established. The volumeoffiuid (VOF) method in conjunction is applied to characterize the behavior of wateroil interface movement. The relations between the average size of droplets, the velocity of water and the equivalent diameter of the spout are obtained. The results of simulation show that the average atomization diameter of water droplets increases with the velocity of water and decreases with the velocity of oil, and it increases with the diameter of atomization pipe. And the droplet size distribution is according with RosinRammler distribution.  基于一种制取流体冰的新方法,对水在互不相溶的油介质中的雾化特性进行了三维数值模拟研究,求解连续性方程和动量守恒方程并考虑重力及表面张力的影响,利用VOF(Volume of Fluid)方法追踪水与油介质之间的移动界面,获得了一定范围内水在静止油介质中雾化水滴的平均直径与水在喷口处流速、喷口当量直径之间的关系式,分析了水在喷口处的流速、油的入口流速以及喷口直径对于雾化水滴大小的影响,并对粒径分布进行统计。研究结果表明,喷口直径越大,水滴的平均直径越大;在流动油介质中雾化形成的水滴平均直径随水在喷口处的流速增加而增大,随油的入口流速的增加而减小,并且水滴粒径符合Rosin—Rammler分布。  
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