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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Pendant drops shed from a liquid lens formed by liquid draining down the inner wall of a wide vertical tube
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Pendant drops shed from a liquid lens formed by liquid draining down the inner wall of a wide vertical tube

机译：由液体透镜通过液体排放在宽垂直管的内壁上而形成的液体滴

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摘要

When a viscous liquid empties from an initially full, wide vertical tube, the drainage behaviour changes from a filament to a regime in which individual drops are shed by a lens formed at the end of the tube: liquid drains down the wall and the lens grows until it becomes unstable. This drop shedding regime was investigated for four Newtonian liquids (rapeseed oil, glycerol, honey and golden syrup) in three tube sizes and two tube materials (Bond number based on tube i.d. 1 in all cases). The drop mass increased modestly with flow rate and the equivalent sphere diameter, d, was strongly related to the capillary length L-c (gamma/pg)(1/2) rather than the tube diameter. The results were fitted to a correlation of the form d/L-c = f(Bond, Reynolds, Morton, sine of the contact angle) derived from dimensional analysis. The data were compared with existing models for drop formation from filled narrow capillaries and a new, simple model based on a quasi-static model of the lens. Agreement with these models was poor, particularly for larger tubes, indicating the need for more detailed analysis. Insights into the dynamics, generated by video analysis of the lens shape, are presented.
机译：当粘性液体从最初完整的宽垂直管中空排空时，排水行为从灯丝变为灯丝，其中各个液滴通过形成在管端部的透镜：液体在墙壁上排出并且透镜增长直到它变得不稳定。在三管尺寸和两个管材料中调查了这一牛顿液体（菜籽油，甘油，蜂蜜和金色糖浆）的滴下制度（基于管I.D的键合数。液滴质量随着流速和等效球直径而增加，D，与毛细管长度L-C（γ/ pg）（1/2）而不是管直径强烈相关。结果适用于尺寸分析的D / L-C = F（键，接触角的粘度，接触角的正弦，所述接触角的正弦）的相关性。将数据与现有模型进行比较，用于从填充的狭窄毛细管和基于镜头的准静态模型的新的简单模型进行液滴形成。与这些模型的协议很差，特别是对于较大的管，表明需要更详细的分析。提出了通过镜片形状的视频分析产生的动态的洞察。

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