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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/1825
Title: Non-Newtonian power-law fluid’s thermal characteristics across periodic array of circular cylinders
Authors: Pravesh R.
Dhiman, Amit Kumar
Bharti, Ram Prakash
Published in: Journal of the Brazilian Society of Mechanical Sciences and Engineering
Abstract: The thermal characteristics of incompressible non-Newtonian power-law fluids across periodic array of circular cylinders have been examined using the finite volume-based numerical solver ANSYS-FLUENT for the following ranges of physical parameters: Reynolds number; 1 ? Re ? 40: Prandtl number; 1 ? Pr ? 100: power-law index; 0.40 ? n ? 1.8; and fluid volume fractions ranging from 0.70 to 0.99. The thermal features have been described via isotherm patterns, local and average Nusselt numbers and the Colburn heat transfer factor and found to be strongly dependent over the above physical parameters. It was observed that the dense isotherms with the increasing inertial and viscous diffusion suggest an improvement in the rate of heat transfer across the periodic cylinders. An increase in local Nusselt number was seen with the increasing values of Re and/or Pr across all the fluid volume fractions. Further, the different behavior of the average Nusselt number was noticed because of the shear-thinning and shear-thickening natures. An enhancement of about 97% was noticed in the shear-thinning region between the extreme fluid volume fractions for the highest value of Pr and the lowest values of Re and n. However, in many cases, the enhancement was noticed to be even more than 100%. An empirical correlation for the average Nusselt number and the Colburn heat transfer factor (j H ) has been developed to give the additional physical insight of the results. Finally, the comparison was made with the available literature which displayed a good agreement with the present results. © 2019, The Brazilian Society of Mechanical Sciences and Engineering.
Citation: Journal of the Brazilian Society of Mechanical Sciences and Engineering (2019), 41(2): -
URI: https://doi.org/10.1007/s40430-019-1584-3
http://repository.iitr.ac.in/handle/123456789/1825
Issue Date: 2019
Publisher: Springer Verlag
Keywords: Average Nusselt number
Cylinders
Fluid volume fractions
Periodic flow
Power-law fluids
Prandtl number
ISSN: 16785878
Author Scopus IDs: 56530845200
8548369300
14521775900
Author Affiliations: Pravesh, R., Department of Chemical Engineering, Institute of Engineering and Technology, Lucknow, 226021, India
Dhiman, A., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Bharti, R.P., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Corresponding Author: Pravesh, R.; Department of Chemical Engineering, Institute of Engineering and TechnologyIndia; email: rpkumariet1971@gmail.com
Appears in Collections:Journal Publications [CH]

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