Numerical study of humid air condensation in presence of non-condensable gas along an inclined channel

Charef, Adil; Feddaoui, M’barek; Alla, Abderrahman Nait; Najim, Monssif

doi:10.1016/j.egypro.2017.11.185

Cited by 7 publications

(10 citation statements)

References 8 publications

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“…This was achieved by solving the boundary-layer equations with a fully coupled implicit numerical approach. Charef et al [10] numerically analysed the heat-and-mass transfer of liquid-film condensation from humid air flowing downwards along an inclined channel. An implicit finite-difference method was used to solve the laminar boundary-layer equations.…”

Section: Condensation Of Vapour On Vertical Plates In the Presence Of...mentioning

confidence: 99%

Performance of the Condensation Process for Water Vapour in the Presence of a Non-Condensable Gas on Vertical Plates and Horizontal Tubes

et al. 2021

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The condensation of humid air is a crucial step in air conditioning and process engineering. However, the models that describe the condensation of vapour in the presence of a non-condensable gas require time-consuming numerical calculations that go beyond the Nusselt film theory. Only a small number of publications exist, where simple and computationally effective correlations for the condensation of water vapour in the presence of air are presented for specially designed condenser heat exchangers. Therefore, the objective of this paper is to extend the existing semi-empirical correlations for different geometries and process parameters. For the purpose of the study, an experimental setup with two different condenser heat exchangers based on vertical plates (height 74 mm) and horizontal tubes (3 tubes, diameter 40 mm and 7 tubes, diameter 15 mm) was built. Additionally, based on existing correlations, we developed two semi-empirical models that predict the condensation mass flux for the proposed geometries. Here, we report that the agreement between the experimental and theoretical values predicted by the new, semi-empirical correlations is excellent, with an average uncertainty of less than ±6%. Their usability was demonstrated by a possibly significant performance improvement of the condenser inside a condensation-type tumble dryer.

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Section: Condensation Of Vapour On Vertical Plates In the Presence Of...mentioning

confidence: 99%

Performance of the Condensation Process for Water Vapour in the Presence of a Non-Condensable Gas on Vertical Plates and Horizontal Tubes

et al. 2021

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“…They noted also, that it resulted in vapor-side enhancement around 3, further 50% of the heat transfer over most of the range of data. In the literature, other authors were interested by the study of heat and mass transfer in vertical tube among them we cite [29]. Also, mass and heat transfer for water film simulated numerically by many authors such [30][31][32][33][34][35][36].…”

Section: Cpmentioning

confidence: 99%

Heat and mass transfer modeling during laminar condensation of non-cryogenic downward fluids flow in a small vertical tube

Belkassmi

Elmaimouni

Rafiki

et al. 2020

International Journal of Thermofluid Science and Technology

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The purpose of this paper is to investigate mass and heat transfer in the process of film condensation of vapor-air mixture for non-cryogenic fluids flow in a small vertical tube. A two-phase mathematical model is developed to model the mixture and liquid film. The governing equations for mixture and liquid-film have been resolved using a numerical method. Furthermore, this phenomenon analyzed is linked to a steady-state. Therefore, the development of numerical codes allows us to investigate the effect of implicated parameters on this phenomenon. Ethanol and methanol as non-cryogenic typical working fluids are realized for a good understanding of the heat and mass transfer mechanism during condensation. In this way, several effects of influencing parameters were examined. The predicted results showed a good agreement with experimental data.

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“…Aside from experimental studies, the condensation process in the presence of NCG has also been extensively theoretically studied by researchers. The developed theoretical models span from simple semi-empirical correlations ( Asano et al., 1979 ; Corradini, 1984 ; Fujii, 1991 ; Kim and Corradini, 1990 ; Liao and Vierow, 2006 ) to complex and computationally extensive numerical models ( Charef et al., 2017 ; Ganguli et al., 2008 ; Karkoszka, 2007 ; Li and Li, 2011 ; Naylor and Friedman, 2010 ; Saraireh et al, 2010 ; Siow et al., 2002 , 2004 , 2007 ; Yi et al., 2015 ). Simple models provide relatively accurate results within the applicable ranges, defined by their corresponding theoretical and experimental study.…”

Section: Introductionmentioning

confidence: 99%

“…A numerical model was provided by solving boundary-layer equations using a fully coupled implicit numerical approach. A similar study was performed by Charef et al. (2017) for laminar film condensation of humid air along an inclined channel, where boundary layer equations were solved using the implicit finite difference method.…”

Section: Introductionmentioning

confidence: 99%

“…Upon a comprehensive literature study, we observed lack of simple models related to humid air flow over a series of vertical flat plates forming vertical channels. Several complex models describing the condensation of humid air on vertical plates do exist but are predominantly computationally demanding ( Charef et al., 2017 ; Ganguli et al., 2008 ; Karkoszka, 2007 ; Li and Li, 2011 ; Naylor and Friedman, 2010 ; Saraireh et al, 2010 ; Siow et al., 2002 , 2004 , 2007 ; Yi et al., 2015 ). Moreover, there is no study, either theoretical or experimental, related to the condensation of water vapor in presence of air on a series of vertical flat plates that form hollow channels.…”

Section: Introductionmentioning

confidence: 99%

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Condensation of water vapor from humid air inside vertical channels formed by flat plates

Poredoš¹,

Petelin²,

Vidrih³

et al. 2022

iScience

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Summary Condensation of humid air is an important process in thermal and process engineering and a subject of many currently research-intensive scientific domains, such as atmospheric water harvesting and seawater desalination. The nature of (water) vapor condensation in the presence of non-condensable gas (NCG) such as air differs significantly from the case with the pure, quiescent vapor condensation. In the literature, simple models that describe the forced flow condensation of water vapor in the presence of air on a series of vertical flat plates are hard to find. Here we present a simple and computationally efficient semi-empirical correlation describing forced flow condensation from humid air inside vertical channels formed by flat plates. The correlation accounts air as a non-condensing gas, different heights of vertical plates, and different thermal-hydraulic parameters. The correlation has been experimentally validated and shows excellent agreement, as 90% of theoretically predicted values are within ±12% of experimental data.

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Numerical study of humid air condensation in presence of non-condensable gas along an inclined channel

Cited by 7 publications

References 8 publications

Performance of the Condensation Process for Water Vapour in the Presence of a Non-Condensable Gas on Vertical Plates and Horizontal Tubes

Performance of the Condensation Process for Water Vapour in the Presence of a Non-Condensable Gas on Vertical Plates and Horizontal Tubes

Heat and mass transfer modeling during laminar condensation of non-cryogenic downward fluids flow in a small vertical tube

Condensation of water vapor from humid air inside vertical channels formed by flat plates

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