In this study, entropy generation of fluid flow in axially moving micro-concentric cylinders for the Couette-Poiseuille slip flow was studied. Fully developed laminar flow was considered with uniform heat flux at the walls. The effects of slip velocity, temperature jump at the walls, and viscous dissipation were taken into consideration. The velocity and temperature profiles were obtained analytically and used to compute the entropy generation. The obtained results were compared with the available data in the literature and an excellent agreement was observed. Effects of Knudsen number, cylinder moving velocity, cylinders radius ratio, Brinkman number and Br/? on the entropy generation were also investigated. It was found that by increasing the Knudsen number and cylinder moving velocity the entropy generation is decreased, while any increase in cylinders radius ratio, Brinkman number, and also Br/? causes the entropy generation to be increased. It was also found that the fluid friction is the main reason for the entropy generation for flow in the annulus region.
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