High‐Pressure Homogenization: Simplified Drop Deformation Estimate during Transition through Orifices
High‐Pressure Homogenization: Simplified Drop Deformation Estimate during Transition through Orifices
复制标题
高压均质化：通过孔口过渡期间简化的液滴变形估计
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Walzel
中科院分区：
文献类型：
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作者：
P. Walzel
初始液滴在通过狭缝或小孔过渡过程中的破碎过程在过去已被频繁地研究过。最近的实验表明，分散相的粘度对变形的滴在入口的孔，不能解释的平衡方法的基础上毛细管数或粘度比的强烈影响。有必要说明这个过程的强瞬态特性。这种行为的定量处理的基础上的关系，从文献和执行可行的数值努力。结果表明，液滴在喷孔前的变形主要受液流延伸速率和系统性质的影响。线状变形液滴是下游后续破碎过程的前体。
The breakup process of primary drops during transition through slots or small openings has been examined frequently in the past. Recent experiments show strong influence of the dispersed-phase viscosity on the deformation of drops at the inlet of orifices that cannot be explained by the equilibrium approach based on capillary numbers or viscosity ratios only. It is necessary to account for the strongly transient character of the process. A quantitative treatment of this behavior based on relationships from the literature and executed with feasible numerical effort is presented. It is shown that the course of the extension rate of the flow and all properties of the system have a major influence on the drop deformation in front of the orifice. The threadlike deformed drops are precursors for the subsequent breakup process downstream.