Fingering instability in non-Newtonian fluids during squeeze flow in a Hele-Shaw cell

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• 作者：M Dutta Choudhury (1)
  S Tarafdar (1)
  
  1. Condensed Matter Physics Research Centre ; Jadavpur University ; Kolkata ; 700032 ; India
  
• 关键词：Squeeze flow ; Fingering ; Hele ; Shaw cell ; Interfacial instability ; 47.15.gp ; 47.50. ; d ; 47.54. ; r ; 47.55. ; t
• 刊名：Indian Journal of Physics
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：89
• 期：5
• 页码：471-477
• 全文大小：1,063 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  Astronomy, Astrophysics and Cosmology
  Physics
  
• 出版者：Springer India
• ISSN：0974-9845

文摘

Instability at the interface separating different fluids, may develop under different conditions, leading to increased roughness of the boundary. A difference in viscosity of the fluids is usually responsible for viscous fingering, this occurs when the pressure on the low viscosity side is higher. We report here a reverse effect when a non-Newtonian fluid is squeezed between two plane surfaces by applying a force. We observe that a wave-like irregularity develops on the interface, though the viscosity of the air surrounding the fluid is negligible compared to the apparent viscosity of the thick potato starch gel under study. Development of the wavelength of the undulations as a function of the fluid composition and other factors is studied. We suggest a qualitative explanation for this effect, which is observed only in non-Newtonian fluids.