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Item The entrance region flow of a Casson fluid in a straight channel has been investigated numerically without making prior assumptions on the form of velocity profile within the boundary layer region, which is determined by a cross-sectional integration of the momentum differential equation for a given distance from the channel entrance. Using the macroscopic mass and momentum balance equations, the thickness of the core, the entrance length, the plug core velocity, and the pressure drop have been obtained at each cross section of the entrance region of the channel for specific values of Casson number. © 1992, Taylor & Francis Group, LLC. All rights reserved.(Entrance region flow of a casson fluid in a straight channel) Batra, R.L.; Kandasamy, A.1992Item Heat and mass transfer effects of casson fluid in the entrance of concentric annuli with moviment of walls(Research Publication, 2020) Nadiminti, S.R.; Kandasamy, A.Heat and mass transfer effects of Casson fluid in the entrance of concentric annuli with moviment of inner wall was analyzed here. The problem analysis concerns the simultaneous development of thermal boundary layers and hydrodynamic in concentric walls, one ring is isothermal and the other wall being adiabatic. With the assumption that the inner ring rotates with a fixed angular velocity, also the outer ring is at rest. The finite difference technique is applied to find the velocity Profiles, variation of pressure in the radial coordinate direction and temperature changes in the same direction. Calculation results are obtained for different annular gap values, Casson number and Prandtl’s number. The comparison of the results for different special cases was made and observed. © 2020, Research Publication. All rights reserved.