SECONDARY FLOW OF A CASSON FLUID IN A SLIGHTLY CURVED TUBE

The fully developed, steady flow of a Casson fluid through a slightly curved tube of circular cross-section has been analysed. The solution is developed by successive approximation from the perturbation of flow of a Casson fluid in a straight tube. The resulting differential equations have been solved by a finite difference method followed by an iterative procedure. Velocity distribution, pressure and nature of the streamlines have been obtained for different values of yield number and Reynolds number. For specific values of the yield number, the results have been compared with those for a Bingham fluid. Comparing the results with a Newtonian fluid, the effect of yield number has been determined.