Occurrence of coexisting dendrite morphologies: immiscible fluid displacement in an anisotropic radial hele-shaw cell under a high flow rate regime

Banpurkar, A. G. ; Limaye, A. V. ; Ogale, S. B. (2000) Occurrence of coexisting dendrite morphologies: immiscible fluid displacement in an anisotropic radial hele-shaw cell under a high flow rate regime Physical Review E, 61 (5). pp. 5507-5511. ISSN 1063-651X

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Official URL: http://pre.aps.org/abstract/PRE/v61/i5/p5507_1

Related URL: http://dx.doi.org/10.1103/PhysRevE.61.5507

Abstract

Viscous fingering morphologies during the displacement of a high viscosity fluid by a low viscosity immiscible fluid in a radial fourfold anisotropic Hele-Shaw cell are examined. By using the kerosene-glycerin system for which the µ/T ratio (µ being the relative viscosity and T the interfacial tension between the fluids) is about ten times higher than that for the commonly used air-glycerin system, we have been able to access the hitherto unexplored Nca 1 regime (capillary number Nca=Uµ/T, U being the advancing fingertip velocity). Within the anisotropy-dominated regime, and when flow rates are significantly high (capillary number well beyond Nca=1), a new phase is seen to evolve wherein the dendrites grow simultaneously along the channels and along the directions making an angle of 45° with the channels, both being kinetically driven. This new phase resembles the one observed in a miscible fluid system at all flow rates of the displacing fluid.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:26871
Deposited On:08 Dec 2010 13:03
Last Modified:17 May 2016 10:10

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