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首页> 外文期刊>International Journal of Heat and Mass Transfer >Droplets behavior of subcooled dispersed phase under nucleate boiling of continuous phase of liquid emulsion
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Droplets behavior of subcooled dispersed phase under nucleate boiling of continuous phase of liquid emulsion

机译：液体乳液连续相成核沸腾时过冷分散相的液滴行为

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The paper considers the influence of the dispersed phase of the emulsion upon the nature of heat and mass transfer in systems of immiscible liquids. In particular, is studied the interfacial interaction and breakage of subcooled drops of the dispersed phase during bubble boiling of the continuous phase of the emulsion. They predetermine the complex nature of the joint behavior of hydrodynamic and thermal processes. It is known that the controlled conditions for dispersion of emulsions in MQCL method under the minimum amount of cooling lubrication be able to improve the quality of metal processing by 10–18% (Maruda et al., 2017). Phase changes liquid generate in it a special kind of pulsation motion: «hot» turbulence of the superheated continuous phase. She is generated by process formation of nuclei and growth of steam bubbles accompanying by the pressure pulsations. Thus heat energy is converted into mechanical energy of the perturbed by the movement of vapor bubbles in evaporating liquid. The formula for the evaluating perturbations of the continuous phase of the emulsion under the influence of vapor bubbles is proposed. The behavior of these fluctuations depends on the frequency of the viable vapor phase nuclei formation related to the heat flow density. The dependence, obtained by Labuntsov (2000) for boiling homogeneous liquid, is used as a characteristic of the thermal velocity.Taking into account the character of the boiling of the continuous phase of emulsion, the generalization of the Kolmogorov-Hinze model has been performed for breakage drops in isothermal flow of emulsion under the influence of turbulent fluctuations of velocity. A correlation model of “thermal” breakup is proposed, which is complementary to the physical representations of the breakup for subcooled drops during the liquid emulsion boiling. Using dimensionless criteria was justified the form of the correlation for the maximum stable droplet size and thermal velocity fluctuations. This makes it possible to relate mechanisms hydrodynamic and thermal processes at use of usual computer tools used in practice for engineering calculations. The correlation for the maximum stable droplet size and thermal velocity fluctuations was developed in a dimensionless form. The results of the model studies were evaluated using the experimental data on the breakup of drops of oil in coolant “oil-water” (Januszkiewicz et al., 2004). They were obtained under conditions of creeping flow in a narrow channel, eliminating the creation of ordinary hydrodynamic turbulence. A good agreement with experimental data indicates that the present model would be promising for the extension of model representations about the breakup of droplets in complex processes of heat and mass transfer in liquid emulsions.
机译：本文考虑了乳液分散相对不混溶液体系统中传热和传质性质的影响。特别地，研究了在乳液的连续相的气泡沸腾期间分散相的过冷液滴的界面相互作用和破裂。他们预先确定了流体动力和热力过程联合行为的复杂性。众所周知，在最小量的冷却润滑下以MQCL方法控制乳液分散的条件能够将金属加工的质量提高10％至18％（Maruda et al。，2017）。相变液体在其中产生一种特殊的脉动运动：过热连续相的“热”湍流。她是由核的过程形成和伴随压力脉动的蒸汽气泡的增长而产生的。因此，热能被汽化液中的汽泡运动转换成扰动的机械能。提出了评价乳液连续相在汽泡影响下的扰动的公式。这些波动的行为取决于与热流密度有关的可行气相核形成的频率。由Labuntsov（2000）获得的沸腾均匀液体的依赖性被用作热速度的特征。考虑到乳液连续相沸腾的特性，对Kolmogorov-Hinze模型进行了推广。湍流速度波动的影响下，乳液等温流中的破损下降。提出了“热”分解的相关模型，该模型与液体乳状液沸腾过程中过冷液滴的分解的物理表示是互补的。使用无量纲标准证明了最大稳定液滴尺寸和热速度波动之间的相关关系形式。这使得有可能使用在实践中用于工程计算的常用计算机工具来关联机构的流体动力学和热过程。最大稳定液滴尺寸与热速度波动之间的关系以无量纲形式形成。模型研究的结果是使用“冷却剂-水”中的油滴破裂的实验数据进行评估的（Januszkiewicz等，2004）。它们是在狭窄通道中的蠕变流条件下获得的，从而消除了普通流体动力湍流的产生。与实验数据的良好一致性表明，本模型有望扩展有关液体乳状液传热和传质复杂过程中液滴破裂的模型表示。

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