scholarly journals Rivulet flow down a slippery substrate

2020 ◽  
Vol 32 (7) ◽  
pp. 072011
Author(s):  
Abdulwahed S. Alshaikhi ◽  
Stephen K. Wilson ◽  
Brian R. Duffy
Keyword(s):  
Rivulet Flow

Numerical Simulation of Gas-Liquid Two-Phase Flows on Wetted Walls

2010 ◽  
Author(s):  
Yoshiyuki Iso ◽  
Xi Chen
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Liquid Flow ◽  
Film Flow ◽  
Liquid Flow Rate ◽  
Flow Transition ◽  
Wall Surface ◽  
Two Phase ◽  
Wall Flows ◽  
Rivulet Flow

Gas-liquid two-phase flows on the wall like liquid film flows, which are the so-called wetted wall flows, are observed in many industrial processes such as absorption, desorption, distillation and others. For the optimum design of packed columns widely used in those kind of processes, the accurate predictions of the details on the wetted wall flow behavior in packing elements are important, especially in order to enhance the mass transfer between the gas and liquid and to prevent flooding and channeling of the liquid flow. The present study focused on the effects of the change of liquid flow rate and the wall surface texture treatments on the characteristics of wetted wall flows which have the drastic flow transition between the film flow and rivulet flow. In this paper, the three-dimensional gas-liquid two-phase flow simulation by using the volume of fluid (VOF) model is applied into wetted wall flows. Firstly, as one of new interesting findings in this paper, present results showed that the hysteresis of the flow transition between the film flow and rivulet flow arose against the increasing or decreasing stages of the liquid flow rate. It was supposed that this transition phenomenon depends on the history of flow pattern as the change of curvature of interphase surface which leads to the surface tension. Additionally, the applicability and accuracy of the present numerical simulation were validated by using the existing experimental and theoretical studies with smooth wall surface. Secondary, referring to the texture geometry used in an industrial packing element, the present simulations showed that surface texture treatments added on the wall can improve the prevention of liquid channeling and can increase the wetted area.

scholarly journals Rivulet flow over and through a permeable membrane

2021 ◽  
Vol 6 (10) ◽  
Author(s):  
Abdulwahed S. Alshaikhi ◽  
Stephen K. Wilson ◽  
Brian R. Duffy
Keyword(s):  
Permeable Membrane ◽  
Rivulet Flow

scholarly journals Transition to Meandering Rivulet Flow in Vertical Parallel-Plate Channels

2004 ◽  
Vol 126 (3) ◽  
pp. 498-499 ◽  
Author(s):  
Glenn E. McCreery and ◽  
Donald M. McEligot
Keyword(s):  
Parallel Plate ◽  
Rivulet Flow

Flow Transition Behavior of the Wetting Flow Between the Film Flow and Rivulet Flow on an Inclined Wall

2011 ◽  
Vol 133 (9) ◽  
Author(s):  
Yoshiyuki Iso ◽  
Xi Chen
Keyword(s):  
Flow Rate ◽  
Liquid Flow ◽  
Surface Texture ◽  
Film Flow ◽  
Liquid Flow Rate ◽  
Flow Simulation ◽  
Surface Shape ◽  
Two Phase ◽  
Vof Model ◽  
Rivulet Flow

Gas-liquid two-phase interfacial flows, such as the liquid film flows (also known as wetting flows on walls), are observed in many industrial processes including absorption, desorption, distillation, and so on. The present study focuses on the characteristics of wetting flows, in particular the drastic transition between the film flow and rivulet flow, as the liquid flow rate and the wall surface texture treatments are varied. The three-dimensional gas-liquid two-phase interfacial flow (wetting flow) simulation is based on the volume of fluid (VOF) model. As the liquid flow rate is increased and then decreased, a hysteresis of the transition between the film flow and rivulet flow is discovered, which implies that the transition phenomenon depends primarily on the history of the change of interfacial surface shape (which affects the process of the flow pattern transition). The applicability and accuracy of the present numerical simulation is validated by using the existing experimental and theoretical studies. Further study on the effect of texture geometry shows that the surface texture treatments added on the wall can impede liquid channeling and increase the wetted area.

Measurements of rivulet flow between parallel vertical plates

2007 ◽  
Vol 33 (4) ◽  
pp. 432-447 ◽  
Author(s):  
Glenn E. McCreery ◽  
Paul Meakin ◽  
Donald M. McEligot
Keyword(s):  
Rivulet Flow

scholarly journals Study of the gas driven water rivulet flow regimes in the minichannels

2016 ◽  
Vol 92 ◽  
pp. 01027
Author(s):  
Olga Svetlichnaya ◽  
Vyacheslav Cheverda
Keyword(s):  
Flow Regimes ◽  
Rivulet Flow

scholarly journals Varieties of the gas driven water rivulet flow regimes in the minichannels

2017 ◽  
Vol 925 ◽  
pp. 012010
Author(s):  
O V Svetlichnaya ◽  
V V Cheverda ◽  
E. O. Kirichenko
Keyword(s):  
Flow Regimes ◽  
Rivulet Flow

Flow and Stability of Rivulets on Heated Surfaces With Topography

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Tatiana Gambaryan-Roisman ◽  
Peter Stephan
Keyword(s):  
Contact Line ◽  
Flow Patterns ◽  
Disjoining Pressure ◽  
Kinematic Wave ◽  
Contact Lines ◽  
Wave Instability ◽  
Long Wave ◽  
Film Instability ◽  
Thermocapillary Instability ◽  
Rivulet Flow

Surfaces 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.

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