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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2016014802
pages 849-864

MIXED CONVECTION HEAT TRANSFER OF NON-NEWTONIAN CARREAU–YASUDA FLUID DRIVEN BY POWER LAW TEMPERATURE GRADIENT

Jinhu Zhao
School of Mathematics and Statistics, Fuyang Normal University, Anhui, China
Liancun Zheng
School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
Xinxin Zhang
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China

SINOPSIS

Mixed convection heat transfer of non-Newtonian fluid in a square cavity is studied. The Carreau–Yasuda model is introduced to characterize the viscosity constitutive relation the modified Fourier's law is used in the energy equation. Numerical cases are performed using the finite volume method with the SIMPLE algorithm. The effects of Carreau–Yasuda parameters, namely, the power law indices n and a (the width of the transition region between zero shear rate viscosity and the power law region), and temperature power law index m on velocity and temperature fields are analyzed. The results obtained indicate that with augmentation of n, the pressure drop decreases almost linearly firstly and then rises, while the Nusselt number increases. Moreover, with augmentation of m, the pressure drop increases and the Nusselt number decreases.


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