Unsteady gravitydriven slender rivulets of a powerlaw fluid
Yatim, YM and Wilson, Stephen K. and Duffy, B.R. (2010) Unsteady gravitydriven slender rivulets of a powerlaw fluid. Journal of NonNewtonian Fluid Mechanics, 165 (2122). pp. 14231430. ISSN 03770257

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Abstract
Unsteady gravitydriven flow of a thin slender rivulet of a nonNewtonian powerlaw fluid on a plane inclined at an angle α to the horizontal is considered. Unsteady similarity solutions are obtained for both converging sessile rivulets (when 0 < α < π/2) in the case x < 0 with t < 0, and diverging pendent rivulets (when π/2 < α < π) in the case x > 0 with t > 0, where x denotes a coordinate measured down the plane and t denotes time. Numerical and asymptotic methods are used to show that for each value of the powerlaw index N there are two physically realisable solutions, with crosssectional profiles that are 'singlehumped' and 'doublehumped', respectively. Each solution predicts that at any time t the rivulet widens or narrows according to x  (2N+1)/2(N+1) and thickens or thins according to x  N/(N+1) as it flows down the plane; moreover, at any station x, it widens or narrows according to t  −N/2(N+1) and thickens or thins according to t  −N/(N+1). The length of a truncated rivulet of fixed volume is found to behave according to t  N/(2N+1).
Item type:  Article 

ID code:  27755 
Keywords:  powerlaw fluid, rivulet, similarity solution, unsteady flow, Probabilities. Mathematical statistics, Mathematics, Materials Science(all), Chemical Engineering(all), Mechanical Engineering, Applied Mathematics, Condensed Matter Physics 
Subjects:  Science > Mathematics > Probabilities. Mathematical statistics Science > Mathematics 
Department:  Faculty of Science > Mathematics and Statistics 
Depositing user:  Mrs Carolynne Westwood 
Date Deposited:  07 Oct 2010 19:10 
Last modified:  01 May 2016 19:48 
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URI:  http://strathprints.strath.ac.uk/id/eprint/27755 
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