Record Details

Coating flow of viscous Newtonian liquids on a rotating vertical disk

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Coating flow of viscous Newtonian liquids on a rotating vertical disk
 
Creator PARMAR, NH
TIRUMKUDULU, MS
HINCH, EJ
 
Subject contactor
film
cylinder
reactor
surface
 
Description We study a Newtonian viscous liquid coating a vertical rotating disk in the creeping flow regime. Experiments were performed at varying disk rotation speeds and liquid volumes, and the thickness profile at steady state was measured. While the maximum liquid supported by the rotating disk varied with rotation rate and liquid viscosity, the numerical value of a dimensionless number signifying the ratio of gravity to viscous forces was the same in all the cases, gamma = 0.30. A lubrication analysis for the time evolution of the film thickness that accounted for gravity, surface tension, and viscous forces was solved numerically to steady state. The predicted thickness profiles are in quantitative agreement with those obtained experimentally. The lubrication equation at steady state was solved analytically in the absence of surface tension to obtain constant height contours that were circular and symmetric about the horizontal axis. However to obtain a complete solution, knowledge of the height variation across the contours is required, and this is controlled by the surface tension. On including this effect, we derived an asymptotic solution to predict thickness profiles that agree well with measurements for large values of viscosity or rotation rates. c 2009 [doi: 10.1063/1.3250858]
 
Publisher AMER INST PHYSICS
 
Date 2011-07-15T13:55:26Z
2011-12-26T12:49:31Z
2011-12-27T05:34:29Z
2011-07-15T13:55:26Z
2011-12-26T12:49:31Z
2011-12-27T05:34:29Z
2009
 
Type Article
 
Identifier PHYSICS OF FLUIDS, 21(10), -
1070-6631
http://dx.doi.org/10.1063/1.3250858
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4297
http://hdl.handle.net/10054/4297
 
Language en