Significance of thermal radiation on dusty fluid flow over a stretching rotating disk with convective boundary condition

Heat Transfer ◽  
2021 ◽  
Author(s):  
M. C. Jayaprakash ◽  
Hogarehally Basavarajappa Mallikarjuna ◽  
Savita B. Megalamani ◽  
Tigalappa Nirmala ◽  
K. C. Rajendra Prasad
Keyword(s):  
Boundary Condition ◽  
Fluid Flow ◽  
Thermal Radiation ◽  
Rotating Disk ◽  
Convective Boundary Condition ◽  
Convective Boundary ◽  
Dusty Fluid

Numerical investigation of laminar forced convection for a non-Newtonian nanofluids flowing inside an elliptical duct under convective boundary condition

2019 ◽  
Vol 29 (1) ◽  
pp. 334-364 ◽  
Author(s):  
Haroun Ragueb ◽  
Kacem Mansouri
Keyword(s):  
Heat Transfer ◽  
Boundary Condition ◽  
Heat Transfer Coefficient ◽  
Fluid Flow ◽  
Transfer Coefficient ◽  
Convective Boundary Condition ◽  
Bulk Temperature ◽  
Convective Boundary ◽  
Content Type ◽  
The Heat Transfer Coefficient

PurposeThe purpose of this study is to investigate the thermal response of the laminar non-Newtonian fluid flow in elliptical duct subjected to a third-kind boundary condition with a particular interest to a non-Newtonian nanofluid case. The effects of Biot number, aspect ratio and fluid flow behavior index on the heat transfer have been examined carefully.Design/methodology/approachFirst, the mathematical problem has been formulated in dimensionless form, and then the curvilinear elliptical coordinates transform is applied to transform the original elliptical shape of the duct to an equivalent rectangular numerical domain. This transformation has been adopted to overcome the inherent mathematical deficiency due to the dependence of the ellipsis contour on the variables x and y. The yielded problem has been successfully solved using the dynamic alternating direction implicit method. With the available temperature field, several parameters have been computed for the analysis purpose such as bulk temperature, Nusselt number and heat transfer coefficient.FindingsThe results showed that the use of elliptical duct enhances significantly the heat transfer coefficient and reduces the duct’s length needed to achieve the thermal equilibrium. For some cases, the reduction in the duct’s length can reach almost 50 per cent compared to the circular pipe. In addition, the analysis of the non-Newtonian nanofluid case showed that the addition of nanoparticles to the base fluid improves the heat transfer coefficient up to 25 per cent. The combination of using an elliptical duct and the addition of nanoparticles has a spectacular effect on the overall heat transfer coefficient with an enhancement of 50-70 per cent. From the engineering applications view, the results demonstrate the potential of elliptical duct in building light-weighted compact shell-and-tube heat exchangers.Originality/valueA complete investigation of the heat transfer of a fully developed laminar flow of power law fluids in elliptical ducts subject to the convective boundary condition with application to non-Newtonian nanofluids is addressed.

scholarly journals Non-linear thermal convection in a Casson fluid flow over a horizontal plate with convective boundary condition

2016 ◽  
Vol 55 (2) ◽  
pp. 1295-1304 ◽  
Author(s):  
Sachin Shaw ◽  
Ganeswar Mahanta ◽  
Precious Sibanda
Keyword(s):  
Boundary Condition ◽  
Fluid Flow ◽  
Thermal Convection ◽  
Convective Boundary Condition ◽  
Casson Fluid ◽  
Horizontal Plate ◽  
Convective Boundary ◽  
Non Linear
Sign in / Sign up

Export Citation Format

Share Document