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Author(s): M. A. Alves
A. Baptista
P. M. Coelho
Title: Simplified method for estimating heat transfer coefficients: constant wall temperature case
Issue Date: 2015
Abstract: This work completes a previous study (Cruzet al., in J Heat Transf 134:091703, 2012) by evaluatingthe performance of the simplified method proposed thereinfor calculating the Nusselt number for laminar flow of nonNewtonian fluids in pipes with constant wall temperature.The methodology was tested using the Herschel-Bulkley,Bingham, Casson and Carreau-Yasuda generalized Newtonian models, and also the simplified form of the PhanThien-Tanner viscoelastic model. The error of the approximate methodology is below 3 %, except for yield stressfluids, for which the maximum error increases to 7.4 % forthe cases analyzed, which cover a wide range of shear viscosity curves. An explicit expression of Nusselt number forCasson fluids is also presented.
Subject: Ciências Tecnológicas, Ciências da engenharia e tecnologias
Technological sciences, Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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