Effects of variable density for film evaporation on laminar mixed convection in a vertical channel

Laaroussi, Najma; Lauriat, Guy; Desrayaud, Gilles

doi:10.1016/j.ijheatmasstransfer.2008.05.022

Cited by 36 publications

(36 citation statements)

References 22 publications

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“…Figure 2 shows comparison of the velocity profiles obtained by the Oberbeck-Boussinesq model (Oulaid et al 2010b) and those calculated by the variable-density model (Laaroussi et al, 2009). The discrepancy between the two models is less than 4%.…”

Section: Methodsmentioning

confidence: 97%

“…The validity of this assumption for simultaneous heat and mass transfer was investigated by Laaroussi et al (2009). These authors compared the Oberbeck-Boussinesq and variable-density models at relatively high temperatures in a vertical parallel-plate channel laminar mixed convection associated with film evaporation.…”

Section: Problem Definition and Modellingmentioning

confidence: 99%

“…This technique gives a more accurate estimation of the temperature gradients at the wall (and, hence, the heat transfer coefficient) than Nusselt's theory, which ignores the inertial effects. An interesting way to deal with the liquid film modelling was used by some authors (Lin et al 1988;Yan 1993;Fedorov et al 1997;Volchkov et al 2004;Huang et al 2005;Azizi et al 2007;Laaroussi et al 2009;Oulaid et al 2010b). These authors assumed an extremely thin liquid film so that it could be treated as a boundary condition.…”

Section: Introductionmentioning

confidence: 99%

“…By comparing their results using various reference property temperatures and concentrations, they concluded that the one-third rule yields the best agreement with the variable-properties model. The validity of the one-third rule for heat and mass transfer problems has been recently checked by Laaroussi et al (2009). These authors mentioned that the one-third rule remains valid provided that the vapour mass fraction is small.…”

Section: Introductionmentioning

confidence: 99%

“…Their results show that measured velocity distributions are in very good agreement with corresponding numerical predictions and illustrate the simultaneous existence of flow reversal in the tube and the annulus for both heating and cooling of the fluid in the tube. As far as developing flows with heat and mass transfer are concerned, studies on flow reversal are rare (Laaroussi et al 2009;Oulaid et al 2010b). Indeed, the majority of the studies on this problem adopted a parabolic model where axial diffusion of momentum, energy and concentration is not taken into account.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Mixed Convection Heat and Mass Transfer with Phase Change and Flow Reversal in Channels

Benhamou¹,

Oulaid²,

Kassim³

et al. 2011

Mass Transfer in Multiphase Systems and Its Applications

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Section: Methodsmentioning

confidence: 97%

Section: Problem Definition and Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mixed Convection Heat and Mass Transfer with Phase Change and Flow Reversal in Channels

Benhamou¹,

Oulaid²,

Kassim³

et al. 2011

Mass Transfer in Multiphase Systems and Its Applications

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Effect of thermo‐solutal stratification on recirculation flow patterns in a backward‐facing step channel flow

Kumar

Murugesan

Gupta

2009

Numerical Methods in Fluids

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SUMMARYThis paper presents results on the combined effect of thermo-solutal buoyancy forces on the recirculatory flow behavior in a horizontal channel with backward-facing step and the ensuing impact on heat and mass transfer phenomena. The governing equations for double diffusive mixed convection are represented in velocity-vorticity form of momentum equations, velocity Poisson equations, energy and concentration equations. Galerkin's finite-element method has been employed to solve the governing equations. Recirculatory flow fields with heat and mass transfer are simulated for opposing and aiding thermo-solutal buoyancy forces by assuming suitable boundary conditions for energy and concentration equations. The effect of Richardson number (0.1 Ri 10) and buoyancy ratio (−10 N 10) on the recirculation bubble and Nusselt and Sherwood numbers are studied in detail. For Richardson number greater than unity, distinct variations in the gradients of Nusselt number and Sherwood number with buoyancy ratio are observed for flow regimes with opposing and aiding buoyancy forces.

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A numerical study based on a weakly compressible formulation for thermosolutal convection in vertical cavities

Sun

Lauriat

2010

Heat Mass Transfer

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International audienceLaminar thermosolutal convection in cavities with uniform, constant temperature and mass fraction profiles at the vertical side is studied numerically. The study is conducted in the case where an inert carrier gas (species ''1'') present in the cavity is not soluble in species ''2'', and do not diffuse into the walls. A mass flux of species ''2'' into the cavity occurs at the hot vertical wall and a mass flux out of the cavity occurs at the opposite cold wall. The weakly compressible model proposed in this work was used to investigate the flow fields, and heat and mass transfer in cavities filled with binary mixtures of ideal gases. The dimensionless form of the seven governing equations for constant thermophysical properties, except density, show that the problem formulation involves ten dimensionless parameters. The results were validated against numerical results published in the literature for purely thermal convection, and thermodynamic predictions for transient thermosolutal flows. A parametric study has een performed to investigate the effects of the initial conditions, molecular weight ratio, Lewis number, and aspect ratio of the cavity for aiding or opposing buoyancy forces. For the range of parameters considered, the results show that variations in the density field have larger effects on mass transfer than on heat transfer. For opposing buoyancy forces, the numerical simulations predict complex flow structures and possible chaotic behavior for rectangular vertical cavities according to the value of the molecular weight ratio

show abstract

Effects of variable density for film evaporation on laminar mixed convection in a vertical channel

Cited by 36 publications

References 22 publications

Mixed Convection Heat and Mass Transfer with Phase Change and Flow Reversal in Channels

Mixed Convection Heat and Mass Transfer with Phase Change and Flow Reversal in Channels

Effect of thermo‐solutal stratification on recirculation flow patterns in a backward‐facing step channel flow

A numerical study based on a weakly compressible formulation for thermosolutal convection in vertical cavities

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