Heat and mass transfer for liquid film evaporation along a vertical plate covered with a thin porous layer

Leu, Jin Sheng; Jang, Ji Yeon; Chou, Yin

doi:10.1016/j.ijheatmasstransfer.2005.11.004

Cited by 41 publications

(11 citation statements)

References 21 publications

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“…We also find in the literature some other studies that have focus on heat and mass transfer with the evaporation of a liquid film flowing in a porous layer. Leu et al [22] numerically studied the heat and mass improvement of liquid film evaporation with a porous layer. e results showed that the heat transfer performance of the liquid film was improved by using a porous layer, and the average Nusselt and Sherwood numbers are increased inversely with porosity, porous layer thickness, and relative humidity.…”

Section: Introductionmentioning

confidence: 99%

Volume of Fluid (VOF) Modeling of Liquid Film Evaporation in Mixed Convection Flow through a Vertical Channel

Baamrani

Bammou

Aharoune

et al. 2021

Mathematical Problems in Engineering

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In this paper, the volume of fluid (VOF) method in the OpenFOAM open-source computational fluid dynamics (CFD) package is used to investigate the coupled heat and mass transfer by mixed convection during the evaporation of water-thin film. The liquid film is falling down on the left wall of a vertical channel and is subjected to a uniform heat flux density, whereas the right wall is assumed to be insulated and dry. The gas mixture consists of air and water vapor. The governing equations in the liquid and in the gas areas with the boundary conditions are solved by using the finite volume method. The results which include temperature, velocity, and vapor mass fraction are presented. The effect of heat flux density, liquid inlet temperature, and mass flow rate on the heat and mass transfer are also analyzed. Better liquid film evaporation is noted for the system with a higher heat flux density and inlet liquid temperature or a lower mass flow rate. Therefore, the VOF method describes well the thermal and dynamic behavior during the evaporation of the liquid film.

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Section: Introductionmentioning

confidence: 99%

Volume of Fluid (VOF) Modeling of Liquid Film Evaporation in Mixed Convection Flow through a Vertical Channel

Baamrani

Bammou

Aharoune

et al. 2021

Mathematical Problems in Engineering

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“…5B, pp. [3093][3094][3095][3096][3097][3098][3099][3100][3101][3102][3103][3104] porous medium property and the temperature difference can considerably impact the heat and mass transfer of both falling and horizontal liquid film evaporation [9][10][11][12]. Narayanan et al [13,14] experimentally and numerically analyzed the manufactured cooling system of thin liquid film covered by porous membrane subjected to jet air and showed that with the heat flux of 500 W/cm 2 , the surface temperature of hot wall reached nearly 360 K under saturation temperature of liquid.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer of flowing liquid film with inserted metal foam layer subjected to air jet impingement

Zhang

Chen

et al. 2019

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI171014080ZIn this paper, coupling the air jet impingement and the copper metal foam above flowing liquid film were employed to enhance the heat transfer. The thickness of flowing liquid film can be controlled owing to the application of the metal foam above the film, and its solid matrix extends the air-liquid-solid interface of heating surface. The evaporated water can be supplied by the capillary force in the porous layer. The experiments were conducted to investigate the performances of the flowing liquid film with inserted porous layer subjected to impinging jet air. The air jet velocity, the flow rate and thicknesses of the liquid film as well as the porosity of metal foam influence the surface temperature of heated wall and the corresponding local heat transfer coefficient greatly. The change ratios of heat transfer coefficient due to the above factors were presented. More cooling can be obtained on the heated wall in the flowing liquid film with inserted porous layer subjected to impinging jet air while the higher liquid film velocity and air jet velocity, the thinner liquid film and the lower porosity of metal foam occur.

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“…Few researchers utilized rough surfaces, such as rib, rod, and porous layers [21], to improve the convective mass transfer by controlling a small thickness of liquid film. Although there were limited studies on the modified surfaces for the liquid film evaporation, various surface modification techniques have been successfully employed in enhancing the evaporation/boiling heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Sweating-boosted air cooling using nanoscale CuO wick structures

Wang

Dawas

Alwazzan

et al. 2017

International Journal of Heat and Mass Transfer

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Low heat transfer coefficient (HTC) in air/fin-side is the bottleneck of dry cooling strategies for thermal power plants. Inspired by the phase change heat transfer during the perspiration of mammals, a sweating-boosted air cooling strategy with on-demand water dripping is proposed. The testing samples are featured with macroscale grooves for global liquid delivery, and with nanoscale hydrophilic copper oxide (CuO) wick structures for local liquid spreading. The experiments of sweating-boosted air cooling are conducted in a wind tunnel system. There are three wetting conditions with increasing dripping rates: dry, partially wetted, and flooded conditions. In the partially wetted conditions, the surface temperatures reduce and HTCs increase with increasing dripping rates. For a given dripping rate of water, HTCs are enhanced and surface temperatures are reduced with increasing air velocities. High air velocity and low surface temperature have a trade-off effect on the evaporation process. This effect results in almost constant saturated dripping rates for a given thermal load. A linear relationship between the saturated dripping rates and the thermal loads confirms that the evaporation dominates the heat transfer process of sweating-boosted air cooling. Complete surface wetting is obtained on the designed surfaces, but no obvious effect of groove width on HTCs is observed. Sweating-boosted air cooling can significantly increase air-fin side HTC in air cooled condenser (ACC), and dramatically reduce the water consumption compared to current water evaporative

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Heat and mass transfer for liquid film evaporation along a vertical plate covered with a thin porous layer

Cited by 41 publications

References 21 publications

Volume of Fluid (VOF) Modeling of Liquid Film Evaporation in Mixed Convection Flow through a Vertical Channel

Volume of Fluid (VOF) Modeling of Liquid Film Evaporation in Mixed Convection Flow through a Vertical Channel

Experimental investigation of heat transfer of flowing liquid film with inserted metal foam layer subjected to air jet impingement

Sweating-boosted air cooling using nanoscale CuO wick structures

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