Mixed Convective Heat Transfer in a Horizontal Channel Heated Periodically From Below

Hasnaoui, M.; Bilgen, E.; Vasseur, P.; Robillard, L.

doi:10.1080/10407789108944823

Cited by 31 publications

(13 citation statements)

References 15 publications

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“…The investigation of the instability problem appears to be significantly important because the instabilities of the PRB flows directly affect various technological and engineering problems such as chemical vapor deposition ͑CVD͒ 1,2 and the cooling of electronic devices. [3][4][5][6] Generally, in these processes, the traveling transverse modes ͑T͒ are preferred to the stationary longitudinal modes ͑L͒. In CVD applications, the ͑L͒ modes are responsible for the formation of undesirable striations parallel to the channel axis.…”

Section: Introductionmentioning

confidence: 99%

Selective control of Poiseuille–Rayleigh–Bénard instabilities by a spanwise magnetic field

et al. 2010

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The stability of a pressure driven flow in an electrically conducting fluid heated from below and subjected to a spanwise constant magnetic field is investigated through a linear stability analysis. The numerical calculations show that such a magnetic field only affects the longitudinal stationary modes ͑L͒, which are stabilized, and has no effect on the transverse traveling modes ͑T͒. A direct consequence is the expansion of the domain where the transverse traveling ͑T͒ modes prevail. This expansion is controlled by the strength of the spanwise magnetic field, expressed through the Hartmann number ͑Ha, ratio of magnetic to viscous dissipation forces͒. Moreover, when Ha exceeds a limiting value depending on the Prandtl number, the ͑T͒ modes become the only dominant modes in the whole Re range. Particular attention was dedicated to the oblique modes ͑O͒ corresponding to fully three-dimensional disturbances in order to verify that they never become the dominant modes when the magnetic field is applied, similarly to what was found without magnetic field. From a practical point of view, these results could be of a great interest since it is known that the optimization of several processes involving the Poiseuille-Rayleigh-Bénard flow is achieved when the traveling ͑T͒ modes prevail.

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Section: Introductionmentioning

confidence: 99%

Selective control of Poiseuille–Rayleigh–Bénard instabilities by a spanwise magnetic field

et al. 2010

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“…Hasnaoui and colleagues studied the periodically heated horizontal channel subjected to laminar natural and forced convection flow. The effects of inertia and buoyancy force were analysed for different ranges of Rayleigh numbers and Reynolds numbers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Prandtl number on the average exit temperature of coolant in a heat‐generating vertical parallel plate channel: A conjugate analysis

Afzal

Kaladgi

et al. 2018

Heat Trans. Asian Res.

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A coupled conduction–convection heat transfer analysis is carried out for a two‐dimensional rectangular, vertical parallel plate channel producing volumetric energy (uniform and nonuniform), subjected to laminar forced‐convection incompressible fluid flow under steady‐state conditions. The equations governing the thermal and flow field are solved by using finite difference method, and the resulting algebraic equations are solved by using the tridiagonal matrix algorithm method. Four coolants with their Prandtl numbers (Pr), namely, liquid sodium (Pr = 0.005), sodium‐potassium (Pr = 0.00753), lead (Pr = 0.02252), and helium (Pr = 0.666) are used for the present conjugate analysis. Effects of different thermal and fluid flow parameters such as Reynolds number (ReH) ranging from 500 to 1500, conduction–convection parameter (Ncc), and total heat generation (Qt) on average exit temperature (θae) of coolants are studied. From the obtained results, it is found that the θae of coolant strongly depends on Pr, ReH, Ncc, and Qt when the aspect ratio (Ar) is kept constant. It is also found that with a nonuniform rate of heat generation, the coolant θae is high compared to uniform heat generation rate, whereas with increasing Ncc, the θae decreases, and with increasing Qt, the θae increases irrespective of coolants.

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“…[3]. Hasnaoui et al [4] have been investigated the mixed convective heat transfer in a horizontal channel heated periodically from below. They observed, for a fixed geometry and a given Rayleigh number, a complicated solution structure upon increasing the Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer Influence on Entropy Generation Fluctuation on Saturated Porous Channel Poiseuille Benard Flow

Bouabid¹,

Bouabda²,

Magherbi³

2018

AJCHE

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This paper reports a transient state numerical investigation of irreversibility in a saturated porous channel, of an aspect ratio A= 5, under vertical thermal and mass gradients. The governing equations, using the Darcy-Brinkman formulation, have been solved numerically by using Control Volume Finite Element Method (CVFEM). Only two variables are taken into account, the Schmidt number and the floatability ratio. The other parameters values are fixed related to the Poiseuille-Benard flow (at zero mass gradients). Results reveal that the flow tends towards the steady state with different regimes, which depends on both the Schmidt number and the buoyancy ratio.

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Mixed Convective Heat Transfer in a Horizontal Channel Heated Periodically From Below

Cited by 31 publications

References 15 publications

Selective control of Poiseuille–Rayleigh–Bénard instabilities by a spanwise magnetic field

Selective control of Poiseuille–Rayleigh–Bénard instabilities by a spanwise magnetic field

Effect of Prandtl number on the average exit temperature of coolant in a heat‐generating vertical parallel plate channel: A conjugate analysis

Mass Transfer Influence on Entropy Generation Fluctuation on Saturated Porous Channel Poiseuille Benard Flow

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