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Modeling of heat transfer conditions in cooling lubricant emulsions with low-boiling continuous media in narrow gaps

机译:在狭窄间隙中使用低沸点连续介质冷却润滑剂乳液的传热条件建模

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摘要

The article analyzes the behavior of the cooling lubricant emulsions of oil-in-water type in a limited volume of narrow gaps. Vapor phase which has been generated by heating the emulsion to a temperature that exceeds the boiling point of water, modifies substantially the conditions of interaction between the dispersed droplets of oil with friction surfaces. Nucleation and growth of vapor bubbles stimulates heat transfer due to the pulsating character of motion of the emulsion and associated with it breakup of the oil droplets. A model of "hot" turbulence has been proposed in the double emulsion of the dispersed phase (oil and steam), initiated by the growth of vapor bubbles. In order to assess the effectiveness of the cooling lubricant emulsion, the mechanisms of hydrodynamic fragmentation of droplets of lubricating oil under conditions of narrow gaps were taken into account. The model was used to estimate the empirical constants in the dependence of the critical temperature from volumetric concentration of oil for AA 5182 aluminum cooling lubricant emulsion El (Januszkiewicz et al., 2004), separating the lubrication regime from the "dry" slip regime. It was shown that the model estimates are in good agreement with the experimental data. Therefore, the obtained results indicate that the model representations of this work do not contradict the physical nature of the complex process of heat transfer.
机译:本文分析了有限体积的窄间隙中水包油型冷却润滑剂乳液的行为。通过将乳液加热到超过水的沸点的温度而产生的汽相基本上改变了分散的油滴与摩擦表面之间相互作用的条件。由于乳液运动的脉动特性以及与之相关的油滴破裂,蒸汽气泡的成核和增长会刺激热传递。已经提出了由蒸气气泡的生长引发的在分散相(油和蒸汽)的双重乳液中的“热”湍流模型。为了评估冷却润滑剂乳液的有效性,考虑了在窄间隙条件下润滑油液滴的流体动力破碎机理。该模型用于估计AA 5182铝冷却润滑剂乳液El(Januszkiewicz等,2004)的临界温度与机油体积浓度之间的依赖于温度的经验常数,从而将润滑方式与“干”滑方式分开。结果表明,模型估计与实验数据吻合良好。因此,获得的结果表明,这项工作的模型表示与矛盾的传热过程的物理性质并不矛盾。

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