Comments on “Influence of chemical reaction and viscous dissipation on MHD mixed convection flow” by K. Das [JMST 28 (5) (2014) 1881~1885] and “Cu-water nanofluid flow and heat transfer over a shrinking sheet” by K. Das [JMST 28 (12) 5089~5094]

2016 ◽  
Vol 30 (1) ◽  
pp. 483-486 ◽  
Author(s):  
P. M. Patil ◽  
P. S. Kulkarni
Keyword(s):  
Heat Transfer ◽  
Mixed Convection ◽  
Viscous Dissipation ◽  
Chemical Reaction ◽  
Convection Flow ◽  
Shrinking Sheet ◽  
Mixed Convection Flow ◽  
Nanofluid Flow ◽  
Flow And Heat Transfer

Unsteady mixed convection flow at a three-dimensional stagnation point

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Amin Noor ◽  
Roslinda Nazar ◽  
Kohilavani Naganthran ◽  
Ioan Pop
Keyword(s):  
Heat Transfer ◽  
Differential Equations ◽  
Mixed Convection ◽  
Stagnation Point ◽  
Three Dimensional ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Content Type ◽  
Flow And Heat Transfer ◽  
Unsteady Mixed Convection

Purpose This paper aims to probe the problem of an unsteady mixed convection stagnation point flow and heat transfer past a stationary surface in an incompressible viscous fluid numerically. Design/methodology/approach The governing nonlinear partial differential equations are transformed into a system of ordinary differential equations by a similarity transformation, which is then solved numerically by a Runge – Kutta – Fehlberg method with shooting technique and a collocation method, namely, the bvp4c function. Findings The effects of the governing parameters on the fluid flow and heat transfer characteristics are illustrated in tables and figures. It is found that dual (upper and lower branch) solutions exist for both the cases of assisting and opposing flow situations. A stability analysis has also been conducted to determine the physical meaning and stability of the dual solutions. Practical implications This theoretical study is significantly relevant to the applications of the heat exchangers placed in a low-velocity environment and electronic devices cooled by fans. Originality/value The case of suction on unsteady mixed convection flow at a three-dimensional stagnation point has not been studied before; hence, all generated numerical results are claimed to be novel.

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