Heat transfer in dropwise condensation at low steam pressures in the absence and presence of non-condensable gas

Tanner, D. W.; Pope, Daniel N.; Potter, C. J.; West, D.

doi:10.1016/0017-9310(68)90148-8

Cited by 88 publications

(25 citation statements)

References 12 publications

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“…Therefore, we set the initial chamber pressure as high as 30 Pa (primarily composed of non-condensable gases, NCG) to avoid the evaporation of oil with steam pressures ranging from 2 to 3 kPa (1 < S < 1.6) in the experiments. This is consistent with actual condenser systems where NCG partial pressures are typically found in the range of 30 Pa and significantly affect the condensation heat transfer performance34353637. Accordingly, with these experimental conditions, we were able to emulate a more realistic condensation environment and demonstrate the practical significance of the immersion condensation mode.…”

Section: Resultssupporting

confidence: 86%

Immersion Condensation on Oil-Infused Heterogeneous Surfaces for Enhanced Heat Transfer

Xiao

Miljkovic

Enright

et al. 2013

Sci Rep

234

219

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Enhancing condensation heat transfer is important for broad applications from power generation to water harvesting systems. Significant efforts have focused on easy removal of the condensate, yet the other desired properties of low contact angles and high nucleation densities for high heat transfer performance have been typically neglected. In this work, we demonstrate immersion condensation on oil-infused micro and nanostructured surfaces with heterogeneous coatings, where water droplets nucleate immersed within the oil. The combination of surface energy heterogeneity, reduced oil-water interfacial energy, and surface structuring enabled drastically increased nucleation densities while maintaining easy condensate removal and low contact angles. Accordingly, on oil-infused heterogeneous nanostructured copper oxide surfaces, we demonstrated approximately 100% increase in heat transfer coefficient compared to state-of-the-art dropwise condensation surfaces in the presence of non-condensable gases. This work offers a distinct approach utilizing surface chemistry and structuring together with liquid-infusion for enhanced condensation heat transfer.

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Section: Resultssupporting

confidence: 86%

Immersion Condensation on Oil-Infused Heterogeneous Surfaces for Enhanced Heat Transfer

Xiao

Miljkovic

Enright

et al. 2013

Sci Rep

234

219

View full text Add to dashboard Cite

show abstract

“…The importance of NCG in condensation was also demonstrated in the present work, where less than 10% NCG was shown to eliminate the gain in performance obtained from promotion of dropwise condensation. This confirms previous results indicating the importance of even low levels of NCG on condensation performance 41 , 56 . Future experiments in this field should be carefully conducted in pure vapor to allow direct comparison between studies unless the target application requires NCG, such as in fog harvesting 16 .…”

Section: Discussionsupporting

confidence: 92%

Heat Transfer Enhancement During Water and Hydrocarbon Condensation on Lubricant Infused Surfaces

Preston

Song

et al. 2018

Sci Rep

120

136

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Vapor condensation is routinely used as an effective means of transferring heat or separating fluids. Dropwise condensation, where discrete droplets form on the condenser surface, offers a potential improvement in heat transfer of up to an order of magnitude compared to filmwise condensation, where a liquid film covers the surface. Low surface tension fluid condensates such as hydrocarbons pose a unique challenge since typical hydrophobic condenser coatings used to promote dropwise condensation of water often do not repel fluids with lower surface tensions. Recent work has shown that lubricant infused surfaces (LIS) can promote droplet formation of hydrocarbons. In this work, we confirm the effectiveness of LIS in promoting dropwise condensation by providing experimental measurements of heat transfer performance during hydrocarbon condensation on a LIS, which enhances heat transfer by ≈450% compared to an uncoated surface. We also explored improvement through removal of noncondensable gases and highlighted a failure mechanism whereby shedding droplets depleted the lubricant over time. Enhanced condensation heat transfer for low surface tension fluids on LIS presents the opportunity for significant energy savings in natural gas processing as well as improvements in thermal management, heating and cooling, and power generation.

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“…It has been found that a very small amount of NCG can result in a significant reduction in heat transfer performance [1][2][3][4][5]. But such cases can be encountered frequently in many practical applications, such as the passive containment cooling system in nuclear power plant, seawater desalination system, toxic components cleaning from the exhaust gases, absorption and energy recovery system etc.…”

Section: Introductionmentioning

confidence: 99%

Condensation heat transfer enhancement in the presence of non-condensable gas using the interfacial effect of dropwise condensation

Zhou

Lan

et al. 2008

International Journal of Heat and Mass Transfer

139

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Heat transfer in dropwise condensation at low steam pressures in the absence and presence of non-condensable gas

Cited by 88 publications

References 12 publications

Immersion Condensation on Oil-Infused Heterogeneous Surfaces for Enhanced Heat Transfer

Immersion Condensation on Oil-Infused Heterogeneous Surfaces for Enhanced Heat Transfer

Heat Transfer Enhancement During Water and Hydrocarbon Condensation on Lubricant Infused Surfaces

Condensation heat transfer enhancement in the presence of non-condensable gas using the interfacial effect of dropwise condensation

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