Effects of Surface Tension on Laminar Filmwise Condensation on a Horizontal Plate in a Porous Medium With Suction at the Wall

Chang, Tong Bou

doi:10.1080/00986440701691186

Cited by 8 publications

(8 citation statements)

References 19 publications

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“…Substituting (19) into (18) and using (20), the dimensionless entropy generation number equations can be rewritten as…”

Section: Liquid-vapor Interfacementioning

confidence: 99%

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Theoretical Analysis of Effects of Wall Suction on Entropy Generation Rate in Laminar Condensate Layer on Horizontal Tube

Chang

2014

Mathematical Problems in Engineering

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The effects of wall suction on the entropy generation rate in a two-dimensional steady film condensation flow on a horizontal tube are investigated theoretically. In analyzing the liquid flow, the effects of both the gravitational force and the viscous force are taken into account. In addition, a film thickness reduction ratio,Sf, is introduced to evaluate the effect of wall suction on the thickness of the condensate layer. The analytical results show that, the entropy generation rate depends on the Jakob number Ja, the Rayleigh number Ra, the Brinkman number Br, the dimensionless temperature differenceψ, and the wall suction parameterSw. In addition, it is shown that in the absence of wall suction, a closed-form correlation for the Nusselt number can be derived. Finally, it is shown that the dimensionless entropy generation due to heat transfer,NT, increases with an increasing suction parameterSw, whereas the dimensionless entropy generation due to liquid film flow friction,NF, decreases.

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“…Substituting (19) into (18) and using (20), the dimensionless entropy generation number equations can be rewritten as…”

Section: Liquid-vapor Interfacementioning

confidence: 99%

“…The problem of laminar film condensation with wall suction effects has been widely discussed in the literature [16][17][18]. In general, the results have shown that wall suction significantly enhances the condensation heat transfer performance.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Effects of Wall Suction on Entropy Generation Rate in Laminar Condensate Layer on Horizontal Tube

Chang

2014

Mathematical Problems in Engineering

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“…A new formulation for one-dimensional, steady-state heat and mass transfer in a porous medium with a two-phase zone was presented by Bridge et al, [36]. The problem of steady filmwise condensation on a finite size horizontal plate embedded in a porous medium with the effect of surface tension was studied by Chang [37]. A non-dimensionless parameter was introduced.…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Region Effect on Film Condensation on an Inclined Plate Embedded in a Porous Medium

Yeu

Gorin

2020

ARFMTS

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Film condensation in a porous medium has been receiving increasing attention due to its wide range of heat transfer applications. Some examples of these practical applications are distillation, drying technology, geothermal energy, cooling towers, heat exchangers, and air conditioning. One of the characteristic features of film condensation in porous media is the formation of a two-phase zone separating the liquid film and the vapour zone due to capillary pressure. In this paper, a physico-mathematical model of liquid film condensation on a surface embedded in a porous medium with a two-phase region effect is developed and presented. The model is based on momentum and continuity equations as applied to the liquid film and the two-phase flow region supplemented with the Darcy flow assumption and assumptions on the Leverette J-function and the saturation behaviour near the edge of the liquid film. The developed model allows a simple analytical solution to the problem in distinction to semi-analytical and numerical solutions published by different authors. From the model developed, it shows that the presence of the two-phase region decreases the liquid film thickness. By taking the capillary effects into consideration results in higher heat transfer and condensation rates due to the decrease in the liquid film thickness. The presented model yields good agreement when compared to the theoretical results and experimental data by other authors. The developed model addresses the fundamental concepts of phase transition in porous media which can effectively find applications in many areas.

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“…While many previous studies [9][10][11][12] have suggested that the heat transfer performance of a condensate film can be enhanced by applying a wall suction effect, the literature lacks a systematic investigation into the characteristics of this effect in condensation on a horizontal tube. Accordingly, the present study conducts a theoretical investigation into the problem of laminar film condensation on a horizontal tube with suction at the wall.…”

Section: Introductionmentioning

confidence: 99%

Film condensation on horizontal tube with wall suction effects

2009

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This study performs a theoretical investigation into the problem of two-dimensional steady filmwise condensation flow on a horizontal tube with suction effects at the tube surface. An effective suction function is introduced to model the effect of the wall suction on the thickness of the liquid condensate film. The local condensate film thickness and the local Nusselt number are then derived using a simple series numerical method. The results show that the Nusselt number varies as a function of the Jakob number Ja, the Rayleigh number Ra, and the suction parameter Sw. It is found that the wall suction effect has a significant influence on the heat transfer performance. An analytical solution is derived for the mean Nusselt number for the case in which the wall suction effect is ignored. Finally, a closed-form correlation is presented for the mean Nusselt number subject to a wall suction effect.

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Effects of Surface Tension on Laminar Filmwise Condensation on a Horizontal Plate in a Porous Medium With Suction at the Wall

Cited by 8 publications

References 19 publications

Theoretical Analysis of Effects of Wall Suction on Entropy Generation Rate in Laminar Condensate Layer on Horizontal Tube

Theoretical Analysis of Effects of Wall Suction on Entropy Generation Rate in Laminar Condensate Layer on Horizontal Tube

Two-Phase Region Effect on Film Condensation on an Inclined Plate Embedded in a Porous Medium

Film condensation on horizontal tube with wall suction effects

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