Entropy generation for pipe flow of a third grade fluid with Vogel model viscosity |
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| Authors: | M. Pakdemirli B.S. Yilbas |
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| Affiliation: | a Department of Mechanical Engineering, Celal Bayar University 45140, Muradiye, Manisa, Turkey
b Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, P.O. Box 1913, Dhahran 31261, Saudi Arabia |
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| Abstract: | The flow of fluid-solid mixtures in a pipe can be treated as non-Newtonian fluids of third grade. Depending upon the fluid viscosity, entropy generation in the flow system varies. In the present study, flow of third grade fluid in a pipe is considered. The Vogel model is introduced to account for the temperature-dependent viscosity. Entropy generation due to fluid friction and heat transfer in the flow system is formulated. The influence of viscosity parameters A and B on the entropy generation number is investigated. It is found that increasing viscosity parameter A reduces the entropy generation number and opposite is true for increasing viscosity parameter B. |
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| Keywords: | Non-Newtonian fluid Pipe flow Third grade fluid Entropy Vogel model |
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