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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 >The effect of plate thickness, surface tension and fluid flow on detachment of drops from a plate
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The effect of plate thickness, surface tension and fluid flow on detachment of drops from a plate

机译：板的厚度，表面张力和流体流动对液滴从板上脱离的影响

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摘要

The pinch-off of drops from the downstream end of plates is an important re-entrainment mechanism of condensate in compact condensers. The present experimental study complements a previous one [A.S. Lexmond, C.W.M. van der Geld, The effect of fluid flow on detachment of drops from the downstream end of a flat plate, Exp. Therm. Fluid Sci. 29 (3) (2005) 363-370], in which ethanol and water drops were created for various mass densities and gas velocities at the downstream end of a plate that was fully wetted. In the present study, the effects of plate thickness and surface tension are studied with ethane drops detaching in ethane vapor flow at near-critical conditions. If the thickness of the plate, D, is introduced as a governing length scale, the Bond number Delta rho gD(2)/sigma is found to indicate whether or not the plate thickness affects drop detachment. A theoretical prediction for the drop size after pinch-off in otherwise quiescent vapor is compared with experiments, which results in a correlation valid for high Bond numbers that are based on the drop diameter. The predictive method presented in the previous study took account of the effect of flow on detaching drop size. It has now been extended and generalized. The combined effect of plate thickness and high vapor velocity is found to lead to a bifurcation in the main drop size after detachment. This phenomenon is due to the facts that the position of the drop foot underneath the plate is unstable, and that detachment near the rim of a plate is essentially different from that from the center of the plate. (C) 2005 Elsevier Inc. All rights reserved.
机译：从板的下游端夹住液滴是紧凑型冷凝器中重要的冷凝水再夹带机制。本实验研究是对先前研究的补充。莱克蒙德（C.W.M.） van der Geld，流体流动对液滴从平板下游端脱离的影响，Exp。 Therm。流体科学29（3）（2005）363-370]，其中在完全浸湿的板的下游端为各种质量密度和气体速度生成了乙醇和水滴。在本研究中，通过在接近临界条件下乙烷液滴在乙烷蒸气流中分离，研究了板厚度和表面张力的影响。如果将板的厚度D作为控制长度的尺度而引入，则发现键数Delta rhogD（2）/ sigma表示板的厚度是否影响液滴的分离。将在别的静止蒸气中夹断后液滴尺寸的理论预测与实验进行了比较，得出的结果对基于液滴直径的高键数有效。先前研究中提出的预测方法考虑了流量对分离液滴尺寸的影响。现在，它已被扩展和概括。发现板厚度和高蒸气速度的共同作用导致分离后主液滴尺寸的分叉。该现象是由于以下事实：落脚在板下方的位置不稳定，并且板边缘附近的脱离与从板中心的脱离本质上不同。 （C）2005 Elsevier Inc.保留所有权利。

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