Mixed convection film condensation from downward flowing vapors onto a sphere with variable wall temperature

1997 ◽  
Vol 33 (1-2) ◽  
pp. 85-91 ◽  
Author(s):  
C.-H. Hsu ◽  
S.-A. Yang
Keyword(s):  
Mixed Convection ◽  
Wall Temperature ◽  
Film Condensation ◽  
Variable Wall Temperature ◽  
Variable Wall

Entropy generation of tangent hyperbolic nanofluid flow past a stretched permeable cylinder: Variable wall temperature

2018 ◽  
Vol 233 (3) ◽  
pp. 570-580 ◽  
Author(s):  
A Mahdy
Keyword(s):  
Magnetic Field ◽  
Differential Equations ◽  
Mixed Convection ◽  
Ordinary Differential Equations ◽  
Entropy Generation ◽  
Wall Temperature ◽  
Governing Equations ◽  
Entropy Generation Number ◽  
Variable Wall Temperature ◽  
Variable Wall

Numerical computations are presented to scrutinize the entropy analysis in a steady magneto-hydrodynamic non-Newtonian tangent hyperbolic nanofluid regime adjacent to an accelerating stretching cylinder manifested with variable wall temperature. Some of the different water-regular nanofluids involving Cu, Ag, Al2O3, and TiO2 have been addressed. Both the motion governing equations and the equation of entropy generation are formulated in cylindrical coordinates. Similar scaling transformation has been chosen to mutate the governing equations into ordinary differential equations system. Then the resulting ordinary differential equations are solved numerically via the implicit finite difference Keller box. In order to comprehend the flow behavior nearby the cylinder surface, the impacts of such different parameters on entropy generation number, velocity, and temperature distributions have been analyzed in detail. As it is noticed, the temperature distribution represents a decreasing function of mixed convection parameter while an opposite trends are given for nanoparticle volume fraction, curvature, and magnetic field parameters. Additionally, the entropy generation number is an increasing function of the Reynolds number, curvature, and mixed convection parameters, whereas it reduces with magnetic field parameter. The given numerical computations have been validated by a comparison with already published literature, which supports our present developed model.

Sign in / Sign up

Export Citation Format

Share Document