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W. G. Pritchard Lab Seminar: 1:00 - 2:00 PM, 315 McAllister Bldg

	            **Wednesday March 22, 2006**
	
Fingering in Newtonian and non-Newtonian Fluids

Kristi E. Holloway

Department of Physics & Physical Oceanography
Memorial University of Newfoundland

Abstract:

We present results from two different experiments involving fluid flow in 
which fingering occurs. In the first instance, we performed viscous 
fingering experiments using a single fluid, glycerine, in which the 
injected and the displaced fluids were at different temperatures. We 
observed a fingering instability for a range of experimental parameters. 
Wavelength values and growth rates of the fingers are presented and 
compared to numerical simulations of a similar system and previous 
theoretical work on miscible viscous fingering. The second experiment 
involves the spreading and fingering of a fluid on a rotating surface. 
This process is known as spin coating. We present results obtained using 
silicone oil, a Newtonian fluid, and compare the results with theoretical 
predictions. We will also discuss ongoing experiments on spin coating 
using Carbopol, a non-Newtonian fluid with a yield stress.

    NOTE SPECIAL TIME AND PLACE: Wed 1:00-2:00, 315 McAllister

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