Double Diffusive Natural Convection in Binary Mixture Under the Effect of External Magnetic Field: Steady and Oscillatory State

Ghernaout, Badia; Bouabdallah, Said; Teggar, Mohamed; Benniche, Hamza

doi:10.18280/ijht.330402

Cited by 5 publications

(8 citation statements)

References 16 publications

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“…Moreover, for no periodically oscillations these changes appear become the endpoints or other unordered structure. This technique has been used successfully by Ghernaout et al [15]. Oscillatory flow regime occurs for the critical value of Rayleigh number Ra = 4.58×10 4 .…”

Section: Onset Of Oscillatory Natural Convectionmentioning

confidence: 99%

“…Recently, Ghernaout et al [15] presented the double diffusive natural convection in binary mixture under the effect of external magnetic field for steady and oscillatory state. The obtained results show a strong dependence of the structure of thermal and solutal effect to the buoyancy ratio and the oscillatory double diffusive flow occurs form a periodic time evolution where the phenomenon change around in each period time.…”

Section: Introductionmentioning

confidence: 99%

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Onset of Natural Convection and Transition Laminar-Oscillatory Convection Flow in Rayleigh-Bénard Configuration

Bouabdallah¹,

Ghernaout²,

Teggar³

et al. 2016

IJHT

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A numerical study of Rayleigh-Bé nard convection in a rectangular cavity has been presented. The onset of natural convection and the transition from laminar to oscillatory convection were considered in this study. The finite volume method was used to solve numerically the governing equations of the phenomenon and the pressure-velocity coupling was matched by SIMPLER Algorithm of Patankar. This study was carried out for Rayleigh number varied from 10 3 to 10 6 in order to control the first value of critical Rayleigh number, Rac-1 corresponding the onset of convection, and that for different aspect ratios of the cavity. The threshold transition regime of laminar-oscillatory convection is depicted by the second critical Rayleigh number Rac-2. Also, the different modes of bifurcation of convection were determined and discussed.

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Section: Onset Of Oscillatory Natural Convectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Onset of Natural Convection and Transition Laminar-Oscillatory Convection Flow in Rayleigh-Bénard Configuration

Bouabdallah¹,

Ghernaout²,

Teggar³

et al. 2016

IJHT

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“…7a-g) for the present work are solved numerically using the finite volume method. The Second Order Upwind scheme is used for both the convective and diffusive terms [14][15]. The control volume integration is the key step of the discretization procedure that distinguishes it from other CFD techniques.…”

Section: Methodsmentioning

confidence: 99%

Turbulent Mixed Convection in Enclosure Containing a Circular/Square Heat Source

Bouabdallah¹,

Chati²,

Ghernaout³

et al. 2016

IJHT

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In this study, we are interested to the turbulent mixed convection in a ventilated enclosure. A heat source is placed at the middle of the enclosure that's equipped with two openings; one is located at the lower left corner and the other located in the upper right corner. The width of the opening "h" represents 1/5 of the side of the cavity. The walls of the cavity are maintained adiabatic. The temperature of the heat source Th is higher than the room temperature. The width of the heat source "D" is equal to the opening width "h" (D = h). The governing equations of turbulent mixed flow convection in the cavity are solved using finite volumes method. A model k-ε of two-equation was used for closure the equations of turbulent regimes. The Grashof number is set constant (Gr = 10 9 ) and the Reynolds number (Re) varied such that the Richardson number (Ri) takes the values : 0.01, 0.05, 0.1, 1, 2, 5, 10, 20 and 30 (Ri = Gr / Re 2 ). The effects of flow thermal, dynamic parameters, the geometry and heat source dimensions are presented and discussed.

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“…Fcr denotes the energy peak which is the dominant frequency. This technique had been successfully used by Ghernaout et al [23]. Figure 11 shows the variation of energy perturbations with their frequencies n P3.…”

Section: Onset Of Oscillatory Flowmentioning

confidence: 99%

Unsteady Double Diffusive Natural Convection with Dufour and Soret Effects

Niche¹,

Bouabdallah²,

Ghernaout³

et al. 2016

IJHT

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Transient double diffusive natural convection in a square cavity is numerically investigated. The enclosure is heated and cooled along the vertical walls with thermal and solutal gradients, the two horizontal walls of the enclosure are adiabatic and impermeable, the Dufour and Soret effects are considered. The governing equations are solved by using control volume method and SIMPLER algorithm. The main focus of this work is to identify the flow regime for thermal and solutal dominated flows. The flow pattern and heat and mass transfer and the effect of various parameters are analyzed (thermal Rayleigh number, Buoyancy ratio, Soret and Dufour coefficients). Comprehensive Nusselt and Sherwood numbers data are presented as functions of the governing parameters. The results showed that both heat and mass transfer increased in the presence of Dufour coefficient, and the Soret coefficient had great effect on the flow structure.

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Double Diffusive Natural Convection in Binary Mixture Under the Effect of External Magnetic Field: Steady and Oscillatory State

Cited by 5 publications

References 16 publications

Onset of Natural Convection and Transition Laminar-Oscillatory Convection Flow in Rayleigh-Bénard Configuration

Onset of Natural Convection and Transition Laminar-Oscillatory Convection Flow in Rayleigh-Bénard Configuration

Turbulent Mixed Convection in Enclosure Containing a Circular/Square Heat Source

Unsteady Double Diffusive Natural Convection with Dufour and Soret Effects

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