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contributor authorTatiana Gambaryan-Roisman
contributor authorPeter Stephan
date accessioned2017-05-09T00:33:53Z
date available2017-05-09T00:33:53Z
date copyrightMarch, 2009
date issued2009
identifier issn0022-1481
identifier otherJHTRAO-27857#033101_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/141101
description abstractSurfaces with topography promote rivulet flow patterns, which are characterized by a high cumulative length of contact lines. This property is very advantageous for evaporators and cooling devices, since the local evaporation rate in the vicinity of contact lines (microregion evaporation) is extremely high. The liquid flow in rivulets is subject to different kinds of instabilities, including the long-wave falling film instability (or the kinematic-wave instability), the capillary instability, and the thermocapillary instability. These instabilities may lead to the development of wavy flow patterns and to the rivulet rupture. We develop a model describing the hydrodynamics and heat transfer in flowing rivulets on surfaces with topography under the action of gravity, surface tension, and thermocapillarity. The contact line behavior is modeled using the disjoining pressure concept. The perfectly wetting case is described using the usual h−3 disjoining pressure. The partially wetting case is modeled using the integrated 6–12 Lennard-Jones potential. The developed model is used for investigating the effects of the surface topography, gravity, thermocapillarity, and the contact line behavior on the rivulet stability. We show that the long-wave thermocapillary instability may lead to splitting of the rivulet into droplets or into several rivulets, depending on the Marangoni number and on the rivulet geometry. The kinematic-wave instability may be completely suppressed in the case of the rivulet flow in a groove.
publisherThe American Society of Mechanical Engineers (ASME)
titleFlow and Stability of Rivulets on Heated Surfaces With Topography
typeJournal Paper
journal volume131
journal issue3
journal titleJournal of Heat Transfer
identifier doi10.1115/1.3056593
journal fristpage33101
identifier eissn1528-8943
keywordsStability
keywordsGravity (Force)
keywordsFlow (Dynamics)
keywordsWaves
keywordsPressure AND Equations
treeJournal of Heat Transfer:;2009:;volume( 131 ):;issue: 003
contenttypeFulltext


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