Effects of Temperature-Dependent Viscosity Variations and Boundary Conditions on Fully Developed Laminar Forced Convection in a Semicircular Duct

Autor:	Milind A. Jog, Raj M. Manglik, T. M. Harms
Rok vydání:	1998
Předmět:	Materials science Mechanical Engineering Finite difference Thermodynamics Laminar flow Mechanics Condensed Matter Physics Nusselt number Forced convection Physics::Fluid Dynamics Viscosity Flow velocity Mechanics of Materials Heat transfer General Materials Science Boundary value problem
Zdroj:	Journal of Heat Transfer. 120:600-605
ISSN:	1528-8943 0022-1481
DOI:	10.1115/1.2824317
Popis:	Fully developed laminar flows in a semicircular duct with temperature-dependent viscosity variations in the flow cross section are analyzed, where the viscosity-temperature behavior is described by the Arrhenius model. Both the T and H1 boundary conditions are considered, as they represent the most fundamental heating/cooling conditions encountered in practical compact heat exchanger applications. Numerical solutions for the flow velocity and the temperature fields have been obtained by finite difference technique. The friction factor and Nusselt number results display a strong dependence on the viscosity ratio (μw/μb), and this is correlated using the classical power-law relationship. However, results indicate that the power-law exponents are significantly different from traditional values for circular tube. They are found to be functions of the flow geometry, boundary condition, and direction of heat transfer (heating or cooling).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e9e2f113e565e9675c2379a55d0b44bc https://doi.org/10.1115/1.2824317 Zobrazit plný text záznamu