Results 241 to 250 of about 2,069 (285)

Inhibition of Condensation Frosting by Arrays of Hygroscopic Antifreeze Drops

Langmuir, 2015
The formation of frost and ice can have negative impacts on travel and a variety of industrial processes and is typically addressed by dispensing antifreeze substances such as salts and glycols. Despite the popularity of this anti-icing approach, some of the intricate underlying physical mechanisms are just being unraveled.
Xiaoda, Sun, Viraj G, Damle, Aastha, Uppal, Rubin, Linder, Sriram, Chandrashekar, Ajay R, Mohan, Konrad, Rykaczewski   +6 more
openaire   +2 more sources

On Localized Vapor Pressure Gradients Governing Condensation and Frost Phenomena

Langmuir, 2016
Interdroplet vapor pressure gradients are the driving mechanism for several phase-change phenomena such as condensation dry zones, interdroplet ice bridging, dry zones around ice, and frost halos. Despite the fundamental nature of the underlying pressure gradients, the majority of studies on these emerging phenomena have been primarily empirical. Using
Saurabh, Nath, Jonathan B, Boreyko
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Condensation frosting detection and characterization using a capacitance sensing approach

International Journal of Heat and Mass Transfer, 2020
Abstract Frost growth is detected using capacitance sensing approach. A capacitive sensor with interdigital electrodes (IDEs) is designed and fabricated based on the fringing effect. Frost growth experiments under different surface temperatures, air temperatures, and air velocities are conducted with simultaneous frost imaging.
Yuchen Shen, Sophie Wang
openaire   +1 more source

Frost formation and condensation in stone-wool insulants

2008
As the experience from building practice shows, condensation in insulating materials can result in serious reduction of thermal properties and, in consequence, systemic upset of living qualities in dwellings. Moisture in building insulants can also affect an increased dust contamination, algae or mold growth as well as damages due to the frost ...
Vrana, Tomas, Vrana, Tomas
openaire   +1 more source

Condensation, Frost Formation, and Frost Melt-Water Retention Characteristics on Microgrooved Brass Surfaces Under Natural Convection

Heat Transfer Engineering, 2013
In this study, frost is grown on microgrooved and flat brass samples under specific operating conditions and a comparison of the condensation, frosting, and defrosting pattern on microgrooved and flat brass surfaces is carried out experimentally. The surfaces are fabricated by a mechanical micromachining process and no chemical alteration of the ...
Md. Ashiqur Rahman, Anthony M. Jacobi
openaire   +1 more source

Delayed Frost Growth on Nanoporous Microstructured Surfaces Utilizing Jumping and Sweeping Condensates

Langmuir, 2020
Self-propelled jumping of condensate droplets (dew) enables their easy and efficient removal from surfaces and is essential for enhancing the condensation heat transfer coefficient and for delaying the frost growth rate on supercooled surfaces. Here, we report the droplet-jumping phenomenon using nanoporous vertically aligned carbon nanotube (VA-CNT ...
Behrouz Mohammadian, Rama Kishore Annavarapu, Asif Raiyan, Srinivasa Kartik Nemani, Sanha Kim, Minghui Wang, Hossein Sojoudi   +6 more
openaire   +2 more sources

Planetary applications of ion induced erosion of condensed-gas frosts

Nuclear Instruments and Methods in Physics Research, 1982
Abstract Condensed gases are a ubiquitous substance on surfaces in the outer solar system. In this paper the effects of incident charged particles on the icy surfaces of the satellites of Jupiter and Saturn, comets, ring particles and ice grains are reviewed using recent data on ion erosion of condensed gases.
R.E. Johnson, L.J. Lanzerotti, W.L. Brown   +2 more
openaire   +1 more source

Condensation Frosting on Micropillar Surfaces – Effect of Microscale Roughness on Ice Propagation

Langmuir, 2020
Microscale surface structures have been widely explored as a promising tool for antifreezing or frost avoidance on heat transfer surfaces. Despite studies of many surface feature designs, the mechanisms associated with condensation freezing and ice propagation on microstructured surfaces have yet to be thoroughly elucidated, espectially when it comes ...
Yuchen Shen, Haoyang Zou, Sophie Wang
openaire   +2 more sources

Condensation frosting on meter-scale superhydrophobic and superhydrophilic heat exchangers

International Journal of Heat and Mass Transfer, 2019
Abstract Frost formation on heat transfer equipment such as air-source heat pump evaporators can result in drastic efficiency penalties. The performance reduction is a result of the insulating nature of ice and the increased fan power required to pump air through the constricted channels between frosted fins.
Kalyan S. Boyina, Allison J. Mahvi, Shreyas Chavan, Deokgeun Park, Kishan Kumar, Maury Lira, Yangxue Yu, Alperen Ahmet Gunay, Xiaofei Wang, Nenad Miljkovic   +9 more
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Frost condensation of sulfur dioxide and snow surface pollution

Russian Meteorology and Hydrology, 2011
Discussed is the mechanism of snow cover pollution caused by the frost condensation of sulfur dioxide. Given are the results of observations of sulfur dioxide concentration variations in the upper snow layer. The temperature gradient value in the surface inversion layer is considered as a determining factor of frost condensation.
openaire   +1 more source