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Break-up of a non-Newtonian jet injected downwards in a Newtonian liquid

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Title Break-up of a non-Newtonian jet injected downwards in a Newtonian liquid
 
Creator LAKDAWALA, AM
THAOKAR, R
SHARMA, A
 
Subject LEVEL-SET METHOD
INCOMPRESSIBLE 2-PHASE FLOWS
DROP FORMATION
FLUID
DYNAMICS
VISCOSITY
MODEL
Generalized Newtonian fluid model
periodic drop formation
quasi-periodic drop formation
satellite drop formation
jetting
no breakup
 
Description The present work on downward injection of non-Newtonian jet is an extension of our recent work (Lakdawala et al, Int. J. Multiphase Flow. 59: 206-220, 2014) on upward injection of Newtonian jet. The non-Newtonian rheology of the jet is described by a Carreau type generalized Newtonian fluid (GNF) model, which is a phenomenological constitutive equation that accounts for both rate-thinning and rate-thickening. Level set method based numerical study is done for Newtonian as well as various types of shear thinning and thickening jet fluid. Effect of average injection velocity (V (av, i) ) is studied at a constant Reynolds number Re = 14.15, Weber number We = 1, Froude number Fr = 0.25, density ratio chi = 0.001 and viscosity ratio eta = 0.01. CFD analysis of the temporal variation of interface and jet length (L (j) ) is done to propose different types of jet breakup regimes. At smaller, intermediate and larger values of V (av, i) , the regimes found are periodic uniform drop (P-UD), quasi-periodic non-uniform drop (QP-NUD) and no breakup (NB) regimes for a shear thinning jet; and periodic along with Satellite Drop (P +S), jetting (J) and no breakup (NB) regimes for a shear thickening jet, respectively. This is presented as a drop-formation regime map. Shear thickening (thinning) is shown to produce long (short) jet length. Diameter of the primary drop increases and its frequency of release decreases, due to increase in stability of the jet for shear thickening as compared to thinning fluid.
 
Publisher INDIAN ACAD SCIENCES
 
Date 2016-01-14T12:36:54Z
2016-01-14T12:36:54Z
2015
 
Type Article
 
Identifier SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES, 40(3SI)819-833
0256-2499
0973-7677
http://dx.doi.org/10.1007/s12046-015-0349-7
http://dspace.library.iitb.ac.in/jspui/handle/100/17514
 
Language en