Convective heat and mass transfer with evaporation of a falling film in a cavity

Jabrallah, Sadok Ben; Belghith, Abdelfettah; Corriou, Jean‐Pierre

doi:10.1016/j.ijthermalsci.2005.05.001

Cited by 44 publications

(28 citation statements)

References 19 publications

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“…Both heating and evaporation zones were already distinguished in the experimental and numerical study of the evaporation of a liquid falling film in a cavity by [5].…”

Section: Liquid Film Temperature Profilesmentioning

confidence: 98%

“…Regarding experimental work on heat and mass transfer in channels, Ben Jabrallah et al [3,5] performed an experimental and numerical study of heat and mass transfer involved in the evaporation of a water liquid film falling along one wall of a closed rectangular cavity filled with air. This wall is heated by a uniform heat flux and the opposite one is cooled and maintained at uniform temperature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and numerical study of mixed convection heat and mass transfer in a vertical channel with film evaporation

Cherif

Kassim²,

Benhamou³

et al. 2011

International Journal of Thermal Sciences

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“…Both heating and evaporation zones were already distinguished in the experimental and numerical study of the evaporation of a liquid falling film in a cavity by [5].…”

Section: Liquid Film Temperature Profilesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of mixed convection heat and mass transfer in a vertical channel with film evaporation

Cherif

Kassim²,

Benhamou³

et al. 2011

International Journal of Thermal Sciences

Self Cite

View full text Add to dashboard Cite

“…There have been a number of attempts to investigate the liquid film flow by both practical and theoretical approaches in the past few years [1][2][3][4][5][6]. Yang and Shen [7] carried out an experimental study of falling film heat transfer in order to show how the heat transfer coefficient was affected by different parameters.…”

Section: Abbreviationsmentioning

confidence: 99%

Numerical study of heat and mass transfer of ammonia-water in falling film evaporator

Huang

2011

Heat Mass Transfer

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To investigate the performance of the heat and mass transfer of ammonia water during the process of falling film evaporation in vertical tube evaporator, a mathematical model of evaporation process was developed and solved based on stream function. Then an experimental study of falling film evaporation was carried out in order to validate the mathematical model. A series of parameters, such as velocity, film thickness and concentration, etc., were obtained from the mathematical model. The calculated results show that the average velocity and the film thickness change sharp at the entrance region when x \ 100 mm, while they vary slightly in the fully developed region when x [ 100 mm. The film thickness depends largely on the flow rate of solution. It is observed that the heating power and mass flow of solution significantly affect the concentration difference between the inlet and outlet of evaporation tube. The calculated results reveal that the tube length has a significant impact on the amounts of ammonia vapor evaporated. It is suggested that the roll-worked enhanced tube should be used in order to decrease the concentration gradient in the film thickness direction and enhance the heat and mass transfer rate. Furthermore, the experimental and calculated results indicate that the inlet solution concentration has a great influence on the heat exchange capacity, the amounts of ammonia vapor evaporated and the evaporation pressure. AbbreviationsC P Specific heat, J kg -1 K -1 D Tube diameter, m D m Diffusion coefficient, m 2 /s H Specific enthalpy, J/kg L Tube length, m m Solution mass flow, kg/h mE The amount of evaporated ammonia vapor, kg/h _ m Evaporation rate, kg/s/m 2 N Sequence number of experiment P Evaporating pressure, kPa PE Percent of evaporated ammonia vapor, % Q Heat exchange capacity between hot water and solution, kW T Temperature,°C u Film velocity of x direction, m/s v Film velocity of y direction, m/s V Volumetric flow of water, L/h DH Enthalpy difference, J/kgGreek symbols n Mass concentration of solution, kg/kg d Film thickness, m U Spray density, kg m -1 s -1 l Dynamic viscosity, N s/m 2 q Density, kg/m 3 k Thermal conductivity, W m -1 K -1

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“…The study reported the effect of liquid film characteristics on the heat and mass transfer and observed that the interfacial heat flux may take higher values than the imposed heat flux. A description of convective heat and mass transfer of falling liquid film evaporation in a cavity was reported by Ben Jabrallah et al [11]. It is shown that intensification of heat and mass transfer occurs with lower feed mass flow rate.…”

Section: Introductionmentioning

confidence: 97%

Computational Study of Liquid Film Evaporation along a Wavy Wall of a Vertical Channel

Najim

Feddaoui

Alla

et al. 2018

Mathematical Problems in Engineering

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A numerical study of mixed convection heat and mass transfer along a vertical channel with a wavy wall is performed. The wavy wall is heated by a constant flux, while the other is adiabatic. The discretisation of equations in both liquid and gas phases is realised using an implicit finite difference scheme. Results of simulation compare the effect of multiple parameters, especially amplitude and characteristic length of the curve, on the liquid film evaporation process. The results indicate that heat and mass transfer is enhanced by increasing the amplitude and number of wall waves. Moreover, a very small value of waves amplitude of the wall may reduce the sensible heat and mass transfer.

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Convective heat and mass transfer with evaporation of a falling film in a cavity

Cited by 44 publications

References 19 publications

Experimental and numerical study of mixed convection heat and mass transfer in a vertical channel with film evaporation

Experimental and numerical study of mixed convection heat and mass transfer in a vertical channel with film evaporation

Numerical study of heat and mass transfer of ammonia-water in falling film evaporator

Computational Study of Liquid Film Evaporation along a Wavy Wall of a Vertical Channel

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