Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11199
Title: Non-Newtonian flow effects on the coalescence and mixing of initially stationary droplets of shear-thinning fluids
Authors: Sun, K
Wang, T
Zhang, P 
Law, CK
Issue Date: 2015
Publisher: American Physical Society
Source: Physical review. E, Statistical, nonlinear, and soft matter physics, 2015, v. 91, no. 2, 23009 How to cite?
Journal: Physical review. E, Statistical, nonlinear, and soft matter physics 
Abstract: The coalescence of two initially stationary droplets of shear-thinning fluids in a gaseous environment is investigated numerically using the lattice Boltzmann method, with particular interest in non-Newtonian flow effects on the internal mixing subsequent to coalescence. Coalescence of equal-sized droplets, with one being Newtonian while the other is non-Newtonian, leads to the non-Newtonian droplet wrapping around the Newtonian one and hence minimal fine-scale mixing. For unequal-sized droplets, mixing is greatly promoted if both droplets are shear-thinning. When only one of the droplets is shear-thinning, the non-Newtonian effect from the smaller droplet is found to be significantly more effective than that from the larger droplet in facilitating internal jetlike mixing. Parametric study with the Carreau-Yasuda model indicates that the phenomena are universal to a wide range of shear-thinning fluids, given that the extent of shear thinning reaches a certain level, and the internal jet tends to be thicker and develops more rapidly with increasing extent of the shear-thinning effect.
URI: http://hdl.handle.net/10397/11199
ISSN: 1539-3755
EISSN: 1550-2376
DOI: 10.1103/PhysRevE.91.023009
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