Laminar film condensation of pseudo-plastic non-Newtonian fluid with variable thermal conductivity on an isothermal vertical plate. (January 2016)

• Record Type: Journal Article
• Authors: Si, Xinhui; Zhu, Xiandong; Zheng, Liancun; Zhang, Xinxin; Lin, Ping
• Is Part Of: International journal of heat and mass transfer. Volume 92(2016:Jan.)
• Page Start: 979
• Page End: 986
• Publication Date: 2016-01
• Subjects: Power-law fluids -- Laminar film condensation -- Dual solutions -- The generalized Prandtl number -- Variable thermal conductivity; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2015.09.061
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: We examine the laminar film condensation of non-Newtonian fluids on an isothermal vertical plate. The thermal conductivity is power-law-dependent on the velocity gradient. The dual solutions are obtained numerically by Runge–Kutta method coupled with shooting method. Abstract: In this paper, we examine the laminar film condensation of pseudo-plastic non-Newtonian fluids with variable thermal conductivity on an isothermal vertical plate. The thermal conductivity is assumed to be power-law-dependent on the velocity gradient. The dual similar solutions, which are influenced by the parameters of the power law number n and the thickness η δ of the condensation film, are obtained numerically by Runge–Kutta method coupled with shooting method. More attention is paid to discuss the first branch of the solutions with physical meaning. Especially the effects of above both parameters on the velocity and temperature distribution, condensation mass flow rate and the local Nusselt number are analyzed in detail.