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Three-dimensional simulation of rivulet and film flows over an inclined plate: Effects of solvent properties and contact angle

Journal Article · · Chemical Engineering Science
 [1];  [1];  [2]
  1. National Energy Technology Lab. (NETL), Albany, OR (United States). Computational Science and Engineering Division
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Computational Sciences Directorate
We numerically investigated the film flow down an inclined plate using the volume of fluid (VOF) method. The flow simulations have been systematically carried out for a wide range of parameters, such as inlet size, inclination angle, contact angle, flow rates and solvent properties (viscosity and surface tension). Based on the simulation results, scaling theory is proposed for both interfacial area and for film thickness in terms of the Kapitza number (Ka).The Kapitza number is advantageous because it depends only on solvent properties. The Kapitza number decreases with increased solvent viscosity and is fixed for a given fluid. Here, to investigate the effects of solvent properties on interfacial area a small inlet cross-section was used. The interfacial area decreases with increased value of Ka. The time to reach pseudo-steady state of rivulet is also observed to increase with decreasing Ka. For a fixed flow rate, the inlet cross-section has marginal effect on the interfacial area; however, the developed width of the rivulet remains unchanged. In addition to inlet size, flow rate and solvent properties, the impact of contact angle on film thickness and interfacial area was also investigated. The contact angle has negligible effect for a fully wetted plate, but it significantly affects the interfacial area of the rivulet. Finally, a scaling theory for interfacial area in terms of the contact angle and Ka is presented.
Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Organization:
USDOE
OSTI ID:
1240901
Alternate ID(s):
OSTI ID: 1253862
OSTI ID: 1398003
Report Number(s):
NETL-PUB--20042; PII: S0009250915007538
Journal Information:
Chemical Engineering Science, Journal Name: Chemical Engineering Science Journal Issue: C Vol. 142; ISSN 0009-2509
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Numerical Modelling of Braiding and Meandering Instabilities in Gravity-Driven Liquid Rivulets journal October 2017
Device-scale CFD modeling of gas-liquid multiphase flow and amine absorption for CO 2 capture: Original Research Article: Device-scale CFD modeling of gas-liquid multiphase flow and amine absorption for CO 2 capture journal March 2018
Numerical simulation of film instability over low wettability surfaces through lubrication theory journal December 2019
A Potential Field Description for Gravity-Driven Film Flow over Piece-Wise Planar Topography journal May 2019

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