Heat transfer characteristics of Taylor vortex flow with shear-thinning fluids. (March 2019)

• Record Type: Journal Article
• Authors: Masuda, Hayato; Shimoyamada, Makoto; Ohmura, Naoto
• Is Part Of: International journal of heat and mass transfer. Volume 130(2019)
• Page Start: 274
• Page End: 281
• Publication Date: 2019-03
• Subjects: Taylor vortex flow -- Heat transfer -- Shear-thinning fluid -- Nusselt number; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2018.10.095
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Heat transfer characteristics of Taylor vortex flow with shear-thinning fluids is investigated. A correlation equation to estimate heat transfer performance is proposed. The thickness of the boundary layer of velocity and temperature increase by a shear-thinning property. Abstract: This study numerically investigates the heat transfer characteristics, including the fluid flow, of a Taylor vortex flow system with shear-thinning fluids. Governing equations were solved using OpenFOAM® 4.0 code. The Carreau model was utilized as the rheological model. The parameter ( n ) in the Carreau model, which describes the slope of a decrease in viscosity with an increase in shear-rate, was varied from 1 to 0.3. The local Nusselt number ( Nu L ) decreased with the increase in shear-thinning property. Furthermore, a correlation equation between the effective Reynolds number ( Re eff ) and a global Nusselt number ( Nu G ) was proposed. Using this equation, Nu G was evaluated within a ± 10% error in the case of n = 1, 0.7, 0.5, and within a ± 20% error in the case of n = 0.3. The size of the Taylor vortices became axially larger with an increase in the shear-thinning property. Furthermore, the thickness of the boundary layer of velocity and temperature increased with an increase in shear-thinning property. The ratio of the thickness of velocity boundary layer to the temperature boundary layer monotonically decreased with an increase in Re eff .