Numerical study of evaporation in a vertical annulus heated at the inner wall

Radhia, Rym Ben; Corriou, Jean‐Pierre; Harmand, Souad; Jabrallah, Sadok Ben

doi:10.1016/j.ijthermalsci.2011.03.007

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…They showed that the evaporative cooling occurs especially for small heating flux and large air velocities. Ben Radhia et al studied the evaporation of a water film in a vertical annulus. They analyzed the influence of the operating parameters on the evaporated water flux.…”

Section: Introductionmentioning

confidence: 99%

Analysis of conjugated processes of film evaporation and condensation in a tubular heat exchanger

2016

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This paper investigates coupled phase changes by forced convection from co‐current flows of liquid films and vapour‐air mixtures in a tubular heat exchanger. Evaporation occurs in the inner tube and condensation in the annulus region. Heat and mass transfers in the liquid films and the vapour‐gas mixtures are described by the conservation equations of momentum, energy, and diffusion. An appropriate change of coordinates is introduced in order to obtain a computational mesh with straight liquid‐mixture interfaces along the walls. The governing equations are discretized by an implicit finite differences method and solved using an efficient numerical methodology. The distributions of axial velocity, temperature, and vapour concentration in all regions of the tubes are determined from iterative procedures with a high convergence rate. The current analysis also provides the axial evolutions of film thicknesses, heat flux, condensation, and evaporation rates in the whole domain. In addition, the effects of the inlet parameters of Reynolds number, relative humidity, pressure, and liquid flow rate on the heat transfer characteristics, and the evaporation and condensation rates are also investigated.

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Section: Introductionmentioning

confidence: 99%

Analysis of conjugated processes of film evaporation and condensation in a tubular heat exchanger

2016

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“…Effective boundary conditions at the open side of two and three dimensional open-ended structures was studied in Vafai (2000, 2002). Convective heat transfer in vertical or inclined annular enclosures with either constant heat lux at the inner wall or constant temperature at inner wall have been studied both experimentally and theoretically by various authors (Davis and Thomas, 1969;El-Shaarawl and Sarhan, 1981;El-Shaarawl and Al-Nimr, 1990;Lal and Kumar, 2013;Mahfouz, 2012;Radhia et al, 2011;Shiniyan et al, 2013). Reddy and Narasimham (2008) performed a numerical study of conjugate natural convection in a vertical annulus with centrally located vertical heat generating rod as the driving source using pressure-correction algorithm with the problem formulated in primitive form.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Flow-pattern Formation in a Cylindrical Cell with Partially Immersed Heating Element

Sharma¹,

Dı́az

2015

AJHMT

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A non-Boussinesq weakly compressible-low numerical model is used to study the temperature and luid velocity distribution in a cylindrical tank with a heating element partially immersed in a temperature dependent luid. This con iguration is commonly found in immersion heaters and electrolytic cells where the heating element does not extend along the entire axial length of the cylindrical vessel. A very particular vortex pattern arises inside the cell which strati ies the domain dividing it into two regions of different temperatures. With the increase in aspect-ratio, the Nusselt number at the surface of heating element increases, while the Nusselt number at the inner surface of cylindrical tank decreases.

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“…This free surface condition is of concern in practical applications of heat dissipation [30]. Linear stability calculations of a thin film flowing down a cylindrical heated wall (see Dávalos-Orozco and You [31]) have demonstrated that high azimuthal modes can be the more unstable ones when the Reynolds number and the wavenumber of the perturbation are small.…”

Section: Introductionmentioning

confidence: 99%

Azimuthal instability modes in a viscoelastic liquid layer flowing down a heated cylinder

Moctezuma-Sánchez

Dávalos‐Orozco

2015

International Journal of Heat and Mass Transfer

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Numerical study of evaporation in a vertical annulus heated at the inner wall

Cited by 15 publications

References 24 publications

Analysis of conjugated processes of film evaporation and condensation in a tubular heat exchanger

Analysis of conjugated processes of film evaporation and condensation in a tubular heat exchanger

Heat Transfer and Flow-pattern Formation in a Cylindrical Cell with Partially Immersed Heating Element

Azimuthal instability modes in a viscoelastic liquid layer flowing down a heated cylinder

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