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A platform for research: civil engineering, architecture and urbanism
Dropwise condensation freezing and frosting on bituminous surfaces at subzero temperatures
https://orcid.org/0000-0003-3309-3568
Graphical abstract Display Omitted
Highlights PCM microcapsule modification can delay frosting on bitumen in repeatable cycles. Condensation deposit forms around freezing droplet while its temperature jumps 0°C. Bitumen temperature and RH controls initial condensation regardless of cooling rate. Water freezes on bitumen at lower temperatures at low RH or fast cooling rates. Cascade freezing expands across supercooled droplets, ice bridging links droplets.
Abstract Freezing of atmospheric water on bituminous construction and road surfaces is a recurring event during winter. However, droplet freezing on bitumen and passive inhibition methods are poorly understood. Here we investigate relative humidity and substrate cooling effects on condensation freezing on subzero temperature bituminous surfaces and find that droplet freezing is explosive, with rapid local heating. We explain the related physics and find that relative humidity and cooling rate can affect droplet sizes and freezing temperatures. We then rationally embed phase change material microcapsules in bitumen, harnessing their latent heat to significantly delay freezing, demonstrating a viable option for frost mitigation.
Dropwise condensation freezing and frosting on bituminous surfaces at subzero temperatures
https://orcid.org/0000-0003-3309-3568
Graphical abstract Display Omitted
Highlights PCM microcapsule modification can delay frosting on bitumen in repeatable cycles. Condensation deposit forms around freezing droplet while its temperature jumps 0°C. Bitumen temperature and RH controls initial condensation regardless of cooling rate. Water freezes on bitumen at lower temperatures at low RH or fast cooling rates. Cascade freezing expands across supercooled droplets, ice bridging links droplets.
Abstract Freezing of atmospheric water on bituminous construction and road surfaces is a recurring event during winter. However, droplet freezing on bitumen and passive inhibition methods are poorly understood. Here we investigate relative humidity and substrate cooling effects on condensation freezing on subzero temperature bituminous surfaces and find that droplet freezing is explosive, with rapid local heating. We explain the related physics and find that relative humidity and cooling rate can affect droplet sizes and freezing temperatures. We then rationally embed phase change material microcapsules in bitumen, harnessing their latent heat to significantly delay freezing, demonstrating a viable option for frost mitigation.
Dropwise condensation freezing and frosting on bituminous surfaces at subzero temperatures
https://orcid.org/0000-0003-3309-3568
Graphical abstract Display Omitted
Highlights PCM microcapsule modification can delay frosting on bitumen in repeatable cycles. Condensation deposit forms around freezing droplet while its temperature jumps 0°C. Bitumen temperature and RH controls initial condensation regardless of cooling rate. Water freezes on bitumen at lower temperatures at low RH or fast cooling rates. Cascade freezing expands across supercooled droplets, ice bridging links droplets.
Abstract Freezing of atmospheric water on bituminous construction and road surfaces is a recurring event during winter. However, droplet freezing on bitumen and passive inhibition methods are poorly understood. Here we investigate relative humidity and substrate cooling effects on condensation freezing on subzero temperature bituminous surfaces and find that droplet freezing is explosive, with rapid local heating. We explain the related physics and find that relative humidity and cooling rate can affect droplet sizes and freezing temperatures. We then rationally embed phase change material microcapsules in bitumen, harnessing their latent heat to significantly delay freezing, demonstrating a viable option for frost mitigation.
Dropwise condensation freezing and frosting on bituminous surfaces at subzero temperatures
Baheri, F. Tarpoudi (author) / Poulikakos, L.D. (author) / Poulikakos, D. (author) / Schutzius, T.M. (author)
2021-06-01
Article (Journal)
Electronic Resource
English
Dropwise condensation freezing and frosting on bituminous surfaces at subzero temperatures
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