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Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2017016342
pages 1473-1495

THERMAL CHARACTERISTICS OF NON-NEWTONIAN POWER-LAW FLUID FLOWS AROUND A CONFINED TRIANGULAR PRISM

Richa Agarwal
Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee - 247 667, India
Amit Kumar Dhiman
Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee - 247 667, India

Краткое описание

The thermal characteristics of non-Newtonian power-law fluid flows in a horizontal channel with a symmetrically built-in equilateral triangular prism have been examined. Particularly, two-dimensional numerical computations are carried out for Reynolds numbers Re = 1–40, Prandtl numbers Pr = 1–50, blockage ratios β = 0.125–0.5, and power-law indices n = 0.4–1.8. Extensive numerical results on isotherm patterns, average Nusselt number, the Colburn heat transfer factor jh, and the local Nusselt number on the surface of the triangular prism are reported to elucidate the combined effects of Re, Pr, β, and n. The results show that for the fixed Re, Pr, and n, the local and average Nusselt numbers increase with β, except for Re = 1 and Pr = 1, where the opposite trend is observed. Also, the average Nusselt number decreases as the fluid behavior alters from pseudoplastic to Newtonian and finally to dilatant (except for Re = 1, Pr = 1, and β = 0.5 for the range n ≤ 0.6), for the fixed Re, Pr, and β. Further, the jh factor is found to increase with increasing β, for the fixed Re, Pr, and n. The maximum percent enhancements in the average Nusselt number at Pr = 1 with respect to that at Pr = 50 are observed to be approximately 80% for both β = 0.125 and 0.25, and approximately 89% for β = 0.5. Finally, a simple heat transfer correlation is determined for various values of Re, Pr, n, and β.


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