Capillary filling dynamics of viscoelastic fluids

Bandopadhyay, Aditya ; Ghosh, Uddipta ; Chakraborty, Suman (2014) Capillary filling dynamics of viscoelastic fluids Physical Review E, 89 (5). Article ID 053024. ISSN 1539-3755

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We consider the filling of a capillary by a viscoelastic fluid described by the Phan-Thien–Tanner (PTT) constitutive behavior. By considering both vertical capillary filling and horizontal capillary filling, we demarcate the role played by gravity and fluid rheology towards long-time oscillations in the capillary penetration depth. We also consider the isothermal filling of the capillary for a closed channel and thus bring out the fundamental differences in the nature of capillary filling for PTT and Newtonian fluids for closed channels in comparison to open channels. Through a scaling analysis, we highlight a distinct viscoelastic regime in the horizontal capillary filling which is in contrast to the Washburn scaling seen in the case of Newtonian fluids. Such an analysis with a very general constitutive behavior is therefore expected to shed light on many areas of microfluidics which focus on biofluids that are often well described by the PTT constitutive behavior.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:100487
Deposited On:10 Nov 2016 11:00
Last Modified:10 Nov 2016 11:00

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