scholarly journals Density Modelling in Mixed Convection Flow in a Vertical Parallel Plate Channel

2021 ◽  
Vol 39 (4) ◽  
pp. 1294-1304
Author(s):  
Perwez Siddiqui
Keyword(s):  
Heat Flux ◽  
Mixed Convection ◽  
Order Approximation ◽  
Boussinesq Approximation ◽  
Constant Heat Flux ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
First Order ◽  
First Order Approximation ◽  
Plate Channel

In this paper, a novel way of modelling the density in buoyancy term of mixed convection flow problem is presented using equation of state and Boussinesq approximation without first-order approximation of density with respect to temperature. The presented density model is used to investigate the laminar mixed convection flow in a vertical parallel plate channel under symmetric constant wall heat flux. The results obtained are compared with the results obtained using first-order approximation of density with Boussinesq approximation, and also compared with the results obtained using variable thermophysical properties with negligible viscous dissipation. Investigation is performed on the basis of flow and thermal fields for Re=150 and 300, Ri=0.1 to 25. It is found that the presented density model produces relatively better results, which is able to describe the case of developing flow under constant heat flux condition that is not evident if Boussinesq approximation with first-order approximation of density is used. An appearance of recirculatory cells when reverse flow takes place is also witnessed in vertical channel flow with constant heat flux boundary condition which was not reported earlier.

Mixed convection flow of viscoelastic fluid over a sphere with constant heat flux

2013 ◽  
Author(s):  
Abdul Rahman Mohd Kasim ◽  
Nurul Farahain Mohammad ◽  
Aurangzaib ◽  
Sharidan Shafie
Keyword(s):  
Heat Flux ◽  
Mixed Convection ◽  
Viscoelastic Fluid ◽  
Constant Heat Flux ◽  
Convection Flow ◽  
Mixed Convection Flow ◽  
Constant Heat

scholarly journals G-jitter fully developed heat transfer by mixed convection flow in a vertical channel with constant heat flux

2020 ◽  
Vol 16 (1) ◽  
pp. 105-108
Author(s):  
Wan Nor Zaleha Amin ◽  
Ahmad Qushairi Mohammad ◽  
Mohammed Abdulhameed ◽  
Sharidan Shafie
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Mixed Convection ◽  
Fourier Method ◽  
Vertical Channel ◽  
Constant Heat Flux ◽  
Convection Flow ◽  
Infinite Length ◽  
Fluid Temperature ◽  
Constant Heat

A theoretical study of mixed convection heat transfer was carried out in an infinite length of vertical channel with both open ends. One of the vertical plates was prescribed with constant heat flux. The effect of g-jitter was also taken into consideration. The Fourier method was utilized to solve the resulting governing equations. The behavior of the fluid temperature and velocity of the flow were studied and presented graphically in this paper. The graphical results were later on analyzed and discussed. The behavior of steady state flow was also investigated. Results confirmed that as wall temperature increased, the fluid temperature increased. The velocity increased due to increments in mixed convection and oscillation parameter, on the other hand, it decreased as a frequency of g-jitter increased. 

Impact of Partial Slip and Heat Source on MHD Mixed Convection Flow of Nanofluid in a Double Lid-Driven Cavity Containing Insulated Obstacle

2020 ◽  
Vol 9 (3) ◽  
pp. 230-241
Author(s):  
M. A. Mansour ◽  
S. Sivasankaran ◽  
A. M. Rashad ◽  
T. Salah ◽  
Hossam A. Nabwey
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Source ◽  
Mixed Convection ◽  
Vertical Wall ◽  
Partial Slip ◽  
Convection Flow ◽  
Uniform Heat Flux ◽  
Mixed Convection Flow ◽  
Left Wall

The current investigation analyzes the effects of partial slip and heat generation on the mixed convection flow with heat transfer in an inclined double lid-driven square cavity containing centered square adiabatic obstacle in the presence of magnetic field. The used cavity is subjected to constant heat flux and filled with Cu-water nanofluid. The top and bottom horizontal walls are thermally insulated and move with uniform velocity while the right vertical wall is maintained at a constant low temperature. A uniform heat flux is located in a part of th left wall of the cavity while the remaining part of this wall is thermally insulated. Finite volume technique is utilized to solve dimensionless governing equations of the problem. The proposed method is validated with the previous published numerical studies which distinctly offer a good agreement. The obtained results show that changing in the heat source length affects much the flow and thermal fields than the position of heat source. The averag Nusselt number decreases when the aspect ratio of the obstacle and heat source length increases. The heat transfer rate behaves nonlinearly with inclination of the cavity.

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