NDLI: Comparison Between Thermal Conductivity Models on Heat Transfer in Power-Law Non-Newtonian Fluids

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Li, Botong Zheng, Liancun Zhang, Xinxin
Copyright Year	2012
Abstract	This paper endeavors to complete a numerical research on forced convection steady heat transfer in power-law non-Newtonian fluids in a circle duct. Incompressible, laminar fluids are to be studied with a uniform wall temperature. A hydrodynamic entrance length is neglected which allows establishing a fully developed flow. The energy equation is solved by using a LU decomposition coupled with control volume technique based on finite difference method. Four thermal conductivity models are adopted in this paper, that is, constant thermal conductivity model, linear thermal conductivity varying with temperature, thermal conductivity varying as a function of velocity gradient, and thermal conductivity varying as a function of temperature gradient. The results are compared with each other and the physical characteristics for values of parameters are also discussed in details. It is shown that the heat transfer behaviors are strongly depending on the power-law index in all models. Comparisons of temperature and local Nusselt number between models are made. It reveals the increasing values of thermal conductivity parameter result in increasing the local Nusselt number when the thermal conductivity is a linear one. Furthermore, there is obvious difference in the local Nusselt number between the constant model and the power-law velocity-dependent model, but Nusselt number varies little from the constant model to the power-law temperature-dependent model.
Starting Page	041702
Ending Page	041708
Page Count	7
File Format	PDF
ISSN	00221481
e-ISSN	15288943
Journal	Journal of Heat Transfer
Volume Number	134
Issue Number	4
DOI	10.1115/1.4004020
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2012-02-13
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fluids Heat transfer Non-Newtonian fluids Temperature Thermal conductivity
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Mechanics of Materials Condensed Matter Physics Materials Science

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