scholarly journals Numerical study of mixed convection and flow pattern in various across-shape concave enclosures

2017 ◽  
Vol 35 (3) ◽  
pp. 567-575 ◽  
Author(s):  
Hamdi Messaoud ◽  
Meziani Bachir ◽  
Sadaoui Djamel
Keyword(s):  
Mixed Convection ◽  
Flow Pattern ◽  
Numerical Study

Numerical study of double diffusive mixed convection around a heated cylinder in an enclosure

2014 ◽  
Vol 78 ◽  
pp. 169-181 ◽  
Author(s):  
Hongtao Xu ◽  
Ruixue Xiao ◽  
Fariborz Karimi ◽  
Mo Yang ◽  
Yuwen Zhang
Keyword(s):  
Mixed Convection ◽  
Numerical Study ◽  
Heated Cylinder ◽  
Double Diffusive

scholarly journals Numerical Simulation of Multiplicity and Stability of Mixed Convection in Rotating Curved Ducts

2005 ◽  
Vol 2005 (2) ◽  
pp. 168-178 ◽  
Author(s):  
Liqiu Wang ◽  
Tianliang Yang
Keyword(s):  
Mixed Convection ◽  
Buoyancy Force ◽  
Numerical Study ◽  
Chaotic Oscillation ◽  
Periodic Oscillation ◽  
Dynamic Responses ◽  
Subharmonic Bifurcation ◽  
Temporal Oscillation ◽  
The Rich ◽  
Curved Ducts

A numerical study is made on the fully developed bifurcation structure and stability of the mixed convection in rotating curved ducts of square cross-section with the emphasis on the effect of buoyancy force. The rotation can be positive or negative. The fluid can be heated or cooled. The study reveals the rich solution and flow structures and complicated stability features. One symmetric and two symmetric/asymmetric solution branches are found with seventy five limit points and fourteen bifurcation points. The flows on these branches can be symmetric, asymmetric, 2-cell, and up to 14-cell structures. Dynamic responses of the multiple solutions to finite random disturbances are examined by the direct transient computation. It is found that possible physically realizable fully developed flows evolve, as the variation of buoyancy force, from a stable steady multicell state at a large buoyancy force of cooling to the coexistence of three stable steady multicell states, a temporal periodic oscillation state, the coexistence of periodic oscillation and chaotic oscillation, a chaotic temporal oscillation, a subharmonic-bifurcation-driven asymmetric oscillating state, and a stable steady 2-cell state at large buoyancy force of heating.

scholarly journals Improved Energy Efficiency of Mixed Convection Heating Process in Eccentric Annulus

2021 ◽  
Vol 13 (8) ◽  
pp. 168781402110391
Author(s):  
Ben Abdelmlek Khaoula ◽  
Ben Nejma Fayçal
Keyword(s):  
Heat Transfer ◽  
Energy Efficiency ◽  
Rayleigh Number ◽  
Mixed Convection ◽  
Heat Transfer Rate ◽  
Transfer Rate ◽  
Rotation Speed ◽  
Numerical Study ◽  
Heating Process ◽  
Eccentric Annulus

This paper deals with a numerical study of mixed convection heat transfer in horizontal eccentric annulus. The inner cylinder is supposed hot and rotating, however the outer one is kept cold and motionless. The numerical problem was solved using COMSOL Multiphysics® which is based on finite element method. The resolution of the partial differential equations was conducted through an implicit scheme with the use of the damped Newton’s method. The present numerical analysis concerns the effect of eccentricity, rotation speed and Rayleigh number on the flow patterns, heat transfer rate, and energy efficiency of the process. It was found that the heat transfer rate increases with the increase of Rayleigh number. In addition, the heat transfer rate drops with the increase of rotation speed. Finally, we have demonstrated that maximum energy efficiency is achieved not only with higher Rayleigh number but also it is maximum with small eccentricity.

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