Numerical study of radiation effect on MHD transient mixed-convection flow over a moving vertical cylinder with constant heat flux

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.

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Transient free convection flow past vertical cylinder with constant heat flux and mass transfer

Ain Shams Engineering Journal ◽

10.1016/j.asej.2015.10.006 ◽

2017 ◽

Vol 8 (4) ◽

pp. 643-651 ◽

Cited By ~ 9

Author(s):

Rudra Kanta Deka ◽

Ashish Paul ◽

Arun Chaliha

Keyword(s):

Mass Transfer ◽

Heat Flux ◽

Free Convection ◽

Vertical Cylinder ◽

Constant Heat Flux ◽

Convection Flow ◽

Free Convection Flow ◽

Constant Heat ◽

Flow Past

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

International Journal of Heat and Technology ◽

10.18280/ijht.390428 ◽

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.

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