Bhagat, Kunal Dilip
(2016)
Instability in pressure-driven displacement flow of one fLuid by another in a pipe.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
The pressure-driven displacement ow of one fluid by another has been widely studied in literature due to its relevance in many natural phenomena and industrial applications, such as pumping of crude oil, in food processing industry, in enhanced oil recovery, to name a few. The present thesis consists of two parts. In the first part, pressure-driven displacement ow of a less viscous fluid initially occupying an axisymmetric pipe by a highly viscous fluid is investigated by conducting numerical simulations. The fluids consist of two species di using at different rates. The fluids are assumed to be Newtonian, incompressible with the same density, but different viscosity modelled as an exponential function of the concentration of both the species. A parametric study investigating the effects of diffusivity ratio, log-mobility ratios of the slower and faster di using species and Reynolds number on the flow dynamics is conducted.
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