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首页> 外文会议>FED-vol.261; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >NUMERICAL INVESTIGATION OF LIQUID-LIQUID COAXIAL FLOWS
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NUMERICAL INVESTIGATION OF LIQUID-LIQUID COAXIAL FLOWS

机译：液-液同轴流的数值研究

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摘要

This paper presents numerical results of the interfacial dynamics of axisymmetric liquid-liquid flows when the more dense liquid is injected in with parabolic inlet velocity profile. The flow dynamics are studied as a function of the individual phase Reynolds numbers, viscosity ratio, velocity ratio, Bond number, and Capillary number. The flows have been categorized as "necking" and "swelling" based on whether the injected fluid radius is smaller or larger than the injection port radius. The jet has been observed to neck when the average inlet velocity ratio is less than unity. The outer fluid velocity has a significant effect on the shape and evolution of the jet as it progresses downstream. As the outer liquid flow rate is increased, the intact jet length is stretched to longer lengths while the jet radius is reduced due to interfacial stresses. The jet radius appears to increase with increase in Bond number and viscosity ratio while it is nearly invariant with changes in Capillary number. The results of numerical simulations using FLUENT~® agree well with the results of experimental measurements and the results of self-similar solution.
机译：本文给出了抛物线速度曲线下注入较稠密液体时轴对称液-液流动界面动力学的数值结果。研究了流动动力学与各相雷诺数，粘度比，速度比，键数和毛细管数的关系。根据注入的流体半径是小于还是大于注入口半径，将流分为“颈缩”和“膨胀”两类。当平均入口速度比小于1时，已观察到喷嘴颈缩。随着射流向下游前进，外部流体速度对射流的形状和演变有重要影响。随着外部液体流速的增加，完整的射流长度会拉伸到更长的长度，而射流半径会由于界面应力而减小。喷射半径似乎随着键数和粘度比的增加而增加，而随着毛细管数的变化几乎不变。使用FLUENT〜®进行的数值模拟结果与实验测量结果和自相似解的结果非常吻合。

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