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热管科学与技术

ISSN 打印: 2151-7975
ISSN 在线: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

热管科学与技术

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.50
pages 79-86

MOTION OF AN ISOLATED LIQUID PLUG INSIDE A DRY CIRCULAR CAPILLARY

Vyas Srinivasan
Indian Institute of Technology, Kanpur, Kanpur 208016, India
Sameer Khandekar
Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India

ABSTRACT

The paper reports an experimental study to understand the movement of a single liquid water plug of length L, placed inside a long, dry, horizontal, circular mini-channel (I.D. 1.5 mm). The plug (of specified L/D ratio) is pushed from rest by controlled injection of air from one side, till a quasi-steady terminal plug velocity is achieved. The plug, in presence of dominating surface forces, forms distinct front and rear menisci. The focus of the study is to understand the contribution of the contact angle of these menisci, and its hysteresis, in determining the pressure required to initiate plug motion. The air pressure required to move the plug from rest and the deformation of advancing and receding contact angles are observed for different plug lengths. It is observed that due to dominating surface effects, the minimum pressure (which corresponds to 'static' friction) required to commence plug motion from rest remains identical, irrespective of the plug length. In addition, the deformation in advancing contact angle is observed to be greater than deformation in receding contact angle. Once the plug starts to move, wall shear opposes the motion, eventually leading to a terminal velocity. At this stage, both the dynamic contact angles remain unchanged. The net force required to sustain plug motion at terminal velocity is substantially larger than the corresponding estimate by Poiseuille flow approximation. Future work involves modeling the relation between critical pressure and the contact angles, with a given hysteresis.


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