Liquid film condensation along a vertical surface in a thin porous medium with large anisotropic permeability

Sanya, Arthur; Akowanou, Christian; Sanya, Emile; Degan, Gérard

doi:10.1186/2193-1801-3-659

Cited by 5 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The concept of thin-film condensation using porous structures has been reported in previous studies. [24][25][26][27][28][29] The current work validates the concept by conducting heat transfer measurements and providing visual confirmation via environmental scanning electron microscopy (ESEM). The insights gained from this work inform material design for condenser surfaces that do not require hydrophobic coating and yet achieve high phase-change heat transfer rate.…”

Section: Introductionsupporting

confidence: 55%

Enhanced Phase-Change Condensation Using Inverse Opals

Adera

Mandsberg

Naworski

et al. 2021

Preprint

View full text Add to dashboard Cite

Phase-change condensation is commonplace in power and process engineering. Due to high surface energy, most condenser surfaces exhibit filmwise mode wherein the condensate is removed due to gravity when the weight overcomes pinning forces. Here, we use cracks (fabrication defects), which form when a copper tube is coated with inverse opals, to transport the condensate away from the condensing surface. Our visualization and experiments show that the cracks have high hydraulic conductivity that preferentially transports the condensate towards the ends of the copper tube. This improves the heat transfer coefficient to ~ 80 kW/m2·K from ~ 12 kW/m2·K for filmwise condensation on smooth copper tubes. Additionally, when the porous inverse opals are impregnated with a lubrication film, the heat transfer coefficient increases by an additional 30% to 103 kW/m2·K. Repeated experiments show that our material design is durable. The insights gained from this work informs the rational design of condenser surfaces.

show abstract

Section: Introductionsupporting

confidence: 55%

Enhanced Phase-Change Condensation Using Inverse Opals

Adera

Mandsberg

Naworski

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…Accurate acquisition of the micro structure and flow properties of porous media is of great importance in petroleum engineering, biomedical science, micro-electronics, and composites (Hilfer and Zauner 2011 ; Sanya et al 2014 ; Tagar et al 2016 ). Thus, the pore-scale modeling, where fluid displacement is simulated in a model of porous medium, has been used as a platform to study multi-phase flow at the pore scale.…”

Section: Introductionmentioning

confidence: 99%

Single- and two-phase flow simulation based on equivalent pore network extracted from micro-CT images of sandstone core

2016

View full text Add to dashboard Cite

Due to the intricate structure of porous rocks, relationships between porosity or saturation and petrophysical transport properties classically used for reservoir evaluation and recovery strategies are either very complex or nonexistent. Thus, the pore network model extracted from the natural porous media is emphasized as a breakthrough to predict the fluid transport properties in the complex micro pore structure. This paper presents a modified method of extracting the equivalent pore network model from the three-dimensional micro computed tomography images based on the maximum ball algorithm. The partition of pore and throat are improved to avoid tremendous memory usage when extracting the equivalent pore network model. The porosity calculated by the extracted pore network model agrees well with the original sandstone sample. Instead of the Poiseuille’s law used in the original work, the Lattice-Boltzmann method is employed to simulate the single- and two- phase flow in the extracted pore network. Good agreements are acquired on relative permeability saturation curves of the simulation against the experiment results.

show abstract

Liquid film condensation along a vertical surface in a thin porous medium with large anisotropic permeability

Cited by 5 publications

References 20 publications

Enhanced Phase-Change Condensation Using Inverse Opals

Enhanced Phase-Change Condensation Using Inverse Opals

Gravitationally Driven Wicking for Enhanced Condensation Heat Transfer

Single- and two-phase flow simulation based on equivalent pore network extracted from micro-CT images of sandstone core

Contact Info

Product

Resources

About