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Entropy analysis for non-Newtonian fluid flow in annular pipe: constant viscosity case. (English) Zbl 1130.76313
Summary: We consider non-Newtonian flow in annular pipe. An analytical solution for velocity and temperature fields is presented while entropy generation due to fluid friction and heat transfer is formulated. The third-grade fluid with constant properties is accommodated in the analysis. It is found that reducing non-Newtonian parameter increases maximum velocity magnitude and maximum temperature in the annular pipe. Total entropy generation number attains high values in the region close to the inner wall of the annular pipe, which becomes significant for low non-Newtonian parameters. Increasing Brinkman number enhances entropy generation number, particularly in the region close to the annular pipe inner wall.

MSC:
76A05 Non-Newtonian fluids
80A20 Heat and mass transfer, heat flow (MSC2010)
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