CHARACTERISTIC FEATURES OF FLOW ENTITIES ON FLOW RATE AND FILM THICKNESS

Abstract

An unsteady state flow of a visco elastic fluid of Rivlin Ericksen type over a vertical flat plate has been examined in this case. The influence of various parameters on the flow field have been studied in detail. When the visco elasticity of the fluid is held constant and as time increases the flow rate also increases, but such an increase is found to be very minimal. Further, it is noticed that over a period of time, the flow rate does not depend much on the visco elasticity of the fluid. Also, for a fixed time, as the porosity of the bounding surface increases, the flow rate is found to be proportional. An interesting observation is that, if the porosity of the fluid bed is held constant, the flow rate remains unchanged over a period of time. Relatively for smaller values of time, as visco elasticity increases the flow rate is in tune with such a parameter. However, the dispersion is found to be not that significant for higher values of time. It is observed that, increase in pore size of the boundary contributes to marginal increase in the flow rate. It is seen that, over a period of time and as it increases, initially a backward flow is observed and thereafter a forward motion is observed.
Key Words: Second order fluid, porous boundary, visco elasticity of the fluid, flow rate, film thickness