The Taylor Couette flow of pseudoplastic fluids is examined while dissipation due to viscous effects through the energy balance. The viscosity of fluid is simultaneously dependent on shear rate and temperature. Exponential dependence of viscosity on temperature is modeled through Nahme law and the shear dependency is modeled according to the Carreau equation. Hydrodynamically, stick boundary conditions are applied and thermally, both constant temperature and constant heat flux on the exterior of cylinders are considered. The governing motion and energy balance equations are coupled adding complexity to the already highly correlated set of differential equations. Introduction of Nahme number has resulted in a nonlinear base flow between the cylinders. As well, the condition of constant heat flux has moved the point of maximum temperature towards the inner cylinder. Taking viscous heating into account, the effects of parameters such as Nahme Number, Deborah Number, material time and pseudoplasticity constant on the heat transfer of the flow are investigated by second law analysis. Moreover, the study shows that the total entropy generation number decreases as the fluid elasticity increases. It, however, increases with increasing Nahme Number.
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ASME 2013 International Mechanical Engineering Congress and Exposition
November 15–21, 2013
San Diego, California, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5635-2
PROCEEDINGS PAPER
Second Law Analysis of Heat Transfer in Taylor Couette Flow for Pseudoplastic Fluid
A. Hazbavi,
A. Hazbavi
Islamic Azad University, Ahvaz, Iran
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N. Ashrafi,
N. Ashrafi
Islamic Azad University, Tehran, Iran
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M. Najafi
M. Najafi
Islamic Azad University, Tehran, Iran
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A. Hazbavi
Islamic Azad University, Ahvaz, Iran
N. Ashrafi
Islamic Azad University, Tehran, Iran
M. Najafi
Islamic Azad University, Tehran, Iran
Paper No:
IMECE2013-62440, V08BT09A037; 8 pages
Published Online:
April 2, 2014
Citation
Hazbavi, A, Ashrafi, N, & Najafi, M. "Second Law Analysis of Heat Transfer in Taylor Couette Flow for Pseudoplastic Fluid." Proceedings of the ASME 2013 International Mechanical Engineering Congress and Exposition. Volume 8B: Heat Transfer and Thermal Engineering. San Diego, California, USA. November 15–21, 2013. V08BT09A037. ASME. https://doi.org/10.1115/IMECE2013-62440
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