A Simplified Method for Calculating Heat Transfer Coefficients and Friction Factors in Laminar Pipe Flow of Non-Newtonian Fluids

作者：Cruz D A; Coelho P M^*; Alves M A

来源：Journal of Heat Transfer-Transactions of the ASME, 2012, 134(9): 091703.

DOI：10.1115/1.4006288

• approximate method
• Nusselt number
• heat transfer
• fully developed pipe flow
• laminar flow
• generalized Newtonian fluid
• friction factor

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. [DOI: 10.1115/1.4006288]

• 出版日期2012-9