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

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• 作者：ABSAR M LAKDAWALA ; ROCHISH THAOKAR ; ATUL SHARMA
• 关键词：Generalized Newtonian fluid model ; periodic drop formation ; quasi ; periodic drop formation ; satellite drop formation ; jetting ; no breakup.
• 刊名：Sadhana
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：40
• 期：3
• 页码：819-833
• 全文大小：1,833 KB
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• 作者单位：ABSAR M LAKDAWALA (1)
  ROCHISH THAOKAR (2)
  ATUL SHARMA (1)
  
  1. Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
  2. Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  
• 出版者：Springer India, in co-publication with Indian Academy of Sciences
• ISSN：0973-7677

文摘

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: 206-20, 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 χ = 0.001 and viscosity ratio η = 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.