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arXiv physics/0608128physics.flu-dyn
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液滴部分聚结的临界参数

Critical parameters for the partial coalescence of a droplet

T. Gilet, K. Mulleners, J. P. Lecomte, N. Vandewalle, S. Dorbolo

摘要:

通过调节两种液体的粘度,对液滴在平面液/液界面上的部分聚结进行了实验研究。这个问题主要取决于四个无量纲参数:邦德数(重力与表面张力),欧姆索奇数(两种流体的粘度与表面张力),和密度相对差异。子液滴尺寸和母液滴尺寸之间的比率作为这些无量纲数的函数进行了研究。在聚结过程中测量了液滴的可用表面能等全局量。详细研究了毛细波的传播和衰减。讨论了这些波与部分合并的关系。提出了额外的粘性机制,以解释这两种粘度所发挥的不对称作用。

英文摘要:

The partial coalescence of a droplet onto a planar liquid/liquid interface is investigated experimentally by tuning the viscosities of both liquids. The problem mainly depends on four dimensionless parameters: the Bond number (gravity vs. surface tension), the Ohnesorge numbers (viscosity in both fluids vs. surface tension), and the density relative difference. The ratio between the daughter droplet size and the mother droplet size is investigated as a function of these dimensionless numbers. Global quantities such as the available surface energy of the droplet has been measured during the coalescence. The capillary waves propagation and damping are studied in detail. The relation between these waves and the partial coalescence is discussed. Additional viscous mechanisms are proposed in order to explain the asymmetric role played by both viscosities.

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