Effects of uniform suction and surface tension on laminar filmwise condensation on a horizontal elliptical tube in a porous medium

Chang, Tong Bou; Yeh, Wen Yu

doi:10.1016/j.ijthermalsci.2009.05.006

Cited by 10 publications

(8 citation statements)

References 17 publications

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“…Prior work has incorporated porous media and porous surfaces in condensation applications with the goal of enhancing heat transfer. − For example, porous fins have been added to the outside of a tube condenser to enhance condensation heat transfer of refrigerants by 180% . Perhaps more similar to the present work, two experimental studies have applied a porous medium directly onto a condenser surface and reported heat transfer enhancements of 56% and subsequently 200% compared to filmwise condensation.…”

Section: Discussionmentioning

confidence: 62%

Gravitationally Driven Wicking for Enhanced Condensation Heat Transfer

Preston

Wilke

et al. 2018

Langmuir

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Vapor condensation is routinely used as an effective means of transferring heat or separating fluids. Filmwise condensation is prevalent in typical industrial-scale systems, where the condensed fluid forms a thin liquid film due to the high surface energy associated with many industrial materials. Conversely, dropwise condensation, where the condensate forms discrete liquid droplets which grow, coalesce, and shed, results in an improvement in heat transfer performance of an order of magnitude compared to filmwise condensation. However, current state-of-the-art dropwise technology relies on functional hydrophobic coatings, for example, long chain fatty acids or polymers, which are often not robust and therefore undesirable in industrial conditions. In addition, low surface tension fluid condensates, such as hydrocarbons, pose a unique challenge because common hydrophobic condenser coatings used to shed water (with a surface tension of 73 mN/m) often do not repel fluids with lower surface tensions (<25 mN/m). We demonstrate a method to enhance condensation heat transfer using gravitationally driven flow through a porous metal wick, which takes advantage of the condensate's affinity to wet the surface and also eliminates the need for condensate-phobic coatings. The condensate-filled wick has a lower thermal resistance than the fluid film observed during filmwise condensation, resulting in an improved heat transfer coefficient of up to an order of magnitude and comparable to that observed during dropwise condensation. The improved heat transfer realized by this design presents the opportunity for significant energy savings in natural gas processing, thermal management, heating and cooling, and power generation.

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Section: Discussionmentioning

confidence: 62%

Gravitationally Driven Wicking for Enhanced Condensation Heat Transfer

Preston

Wilke

et al. 2018

Langmuir

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“…powerplants, heat exchangers and refrigeration, many effects on the film condensation have been addressed, including surface temperature [7][8][9], turbulent flow [10,11], wall suction [12][13][14] and others [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of vapor condensation on a flat plate and horizontal cryogenic tube using lattice Boltzmann method

Hatani

Farhadzadeh

Rahimian

2015

International Communications in Heat and Mass Transfer

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“…There were many research reporting relationship about gas phase velocity toward heat transfer inside a porous media, however, the research generally applied gas velocity in axial direction when it enters to penetrate a porous media layer with uniform shape of channel [1], [2], and [3]. From this point of view, therefore, this present study tries to perform analysis of heat transfer in a porous media layer forced by a tangentially heated-air flow, inside a suddenly enlarged-contracted channel.…”

Section: Introductionmentioning

confidence: 99%

Convective Regimes on Porous Media within Sudden Changed Channel due to Tangential Gas Flow

Siswanto

Rahana

Choiron

et al. 2016

AMM

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Study of lateral heat distribution in porous media caused by tangentially heated air flow is presented. Purpose of present study is to investigate effect of air velocity streamed tangentially, through a sudden enlarged-contracted channel, over a porous media layer toward heat distribution inside the layer. Air with temperature 373 K, as a heat source, is streamed over upper-facing of the porous layer, while its intake velocities are varied respectively at 0.5 to 2.5 m/s. Lower-facing of the porous layer, temperature is held on 313 K constant, as a heat sink. The consolidated porous layer is made from aluminum with porosity 38%. Important informations are obtained. Sudden enlarged-contracted channel generates non-linear heat transfer inside the porous media, whereas the suddenly enlarged channel enhances the molecular conductance, and the sudden contracted one increases the convective conductance.Thislaminar tangential gas flow yields the heat transfer takes respectively on free-, forced-, and combined-convective regime. It is also known that the combined convection is due to air flow at average Reynolds number 231.26.

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Effects of uniform suction and surface tension on laminar filmwise condensation on a horizontal elliptical tube in a porous medium

Cited by 10 publications

References 17 publications

Gravitationally Driven Wicking for Enhanced Condensation Heat Transfer

Gravitationally Driven Wicking for Enhanced Condensation Heat Transfer

Investigation of vapor condensation on a flat plate and horizontal cryogenic tube using lattice Boltzmann method

Convective Regimes on Porous Media within Sudden Changed Channel due to Tangential Gas Flow

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