A Simplified Method for Calculating Heat Transfer Coefficients and Friction Factors in Laminar Pipe Flow of Non-Newtonian Fluids
Keyword(s):
In this work, we propose an approximate methodology to estimate the Nusselt number and friction factor in fully developed non-Newtonian laminar flow in circular pipes for a constant wall heat flux. The methodology was tested using several constitutive equations, including generalized Newtonian fluids and viscoelastic models such as the simplified Phan-Thien–Tanner (sPTT), Herschel–Bulkley, Bingham, Casson, and Carreau–Yasuda constitutive equations. The error of the approximate methodology was found to be smaller than 3.2%, except for the fluids with yield stress for which the maximum error increased to about 8% for the cases analyzed, which cover a wide range of shear viscosity curves.
2015 ◽
Vol 7
(1)
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Keyword(s):
2018 ◽
Vol 40
(7)
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pp. 549-558
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Keyword(s):
2020 ◽
Vol 234
(2)
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pp. 173-181
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2008 ◽
Vol 07
(06)
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pp. 325-331
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