Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Frosting"”.
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Wetting and frosting/defrosting study on microgrooved surfaces
… of surface wettability on the condensation and frosting processes, to minimize condensate retention and frosting penalties, and to promote effective defrosting. In the present study, the effects of microgrooved surface topography on metal substrates, fabricated without any chemical modification …
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Condensation Frosting: From Ice Bridges to Dry Zones
… of frost formation on substrates is condensation frosting, where dew drops condense on a supercooled surface and subsequently freeze, and has been known since the time of Aristotle. The physics of frost incipience at a microscopic scale has, nevertheless, eluded researchers because of an …
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Fundamental understanding of condensation frosting and precise detection with capacitive sensors
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Enhanced Portability and Anti-Frosting Functionality of Cryostats for Synchrotron-Based X-ray Imaging
The intensity of light produced from synchrotrons enables X-ray imaging down to the micron and submicron scale. This high degree of resolution is necessary to study metals in hydrated biological samples, where trace (metal) elements are found in the lowest concentration. Water within these aqueous …
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Scalable manufacturing and durability characterization of functional surfaces for condensation and anti-frosting purposes
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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TRANSIENT MODELING OF TWO-STAGE AND VARIABLE REFRIGERANT FLOW VAPOR COMPRESSION SYSTEMS WITH FROSTING AND DEFROSTING
… drop performance of the heat exchanger. The frosting and defrosting models developed in the thesis are integrated into this heat exchanger model, allowing more accurate performance assessment of heat pumps. Meanwhile, an advanced low-order moving boundary heat exchanger model is developed …
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Impact of heat exchanger surface wettability on condensation, frosting, and defrosting performance under practical testing conditions
… and electric vehicle heat pumps (EV HPs), frosting under cold and humid conditions is particularly problematic, as it forces frequent defrosting cycles that restore performance only at the expense of significant efficiency losses. Reducing the impact of condensation and frost on system …
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The performance of a reversible R744 vapor compression system with an internal heat exchanger in continuous frosting/ defrosting cycles
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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A modern econometric approach to estimating theoretically consistent demand systems of retail brands
… an empirical investigation of the cake mix and frosting demand system using daily data on sales figures, prices and marketing mix variables. SUR maximum likelihood is used to estimate static and dynamic (error correction) linear almost ideal demand systems. Results compare static and dynamic …
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An Analytical and Empirical Study of Frost Accumulation Effects on Louvered -Fin, Microchannel Heat Exchangers
… can be used to evaluate geometry effects on the frosting behavior of the louvered-fin, microchannel heat exchangers, and can be easily generalized to other applications with simultaneous heat and mass transfer.
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The Interaction Between the Substrate and Frost Layer Through Condensate Distribution
… The deposition of vapor at the beginning of the frosting process on a clean glass substrate is found to be as condensate rather than as for a substrate temperatures above -33°C and an absolute humidity above 0.15 g/kg. The inception of ""condensation frosting"" is further examined …
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Liquid-infused slippery surfaces for air-conditioning and refrigeration applications
… 5˚ and reduces the water retention ratio after defrosting by more than 75% compared to the baseline specimen. A delay of ice formation is also observed. These LISs can effectively drain condensate, retard frost formation, and reduce frost meltwater retention. Water droplet configuration on the …
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Laminar-flow Liquid-to-air Heat Exchangers - Energy-efficient Display Cabinet Applications
… condensation of water vapour, and sometimes even frosting, and is therefore different from other applications where flat-tube heat exchangers have been used earlier. The objective of this research work has been to find a suitable, more energy-efficient, heat exchanger design for indirectly cooled …
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The effect of surface wettability on frost growth and densification on flat plates
… The coated aluminum plates are then subjected to frosting conditions in wind tunnel experiments. The cooling rate during the condensation phase affects the frost thickness and density for hydrophilic and hydrophobic surfaces alike, with the low-cooling-rate condensation phase resulting in a …
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INVESTIGATION OF PERFORMANCE DEGRADATION OF EVAPORATOR FOR LOW TEMPERATURE REFRIGERATION APPLICATIONS
… constantly by accumulation of frost during each frosting cycle, which resulted in the loss of superheat towards the end of each cycle. The defrost operation could not restore the full capacity of the evaporator. The defrost cycle consists out of two phases, melting the ice and re-cooling the …
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Factors controlling the distribution and spread of bracken (Pteridium Aquilinum) in Scotland
… in the west can withstand a greater degree of frosting than the less vigorous bracken in the east. Soil moisture stress, heavy frost and relatively intensive agriculture in the east results in a higher bracken zone (and therefore suboptimal soils and temperatures) in the east than in the west.
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Sedimentology and micropalaeontology of gravity cores from the N.E. Atlantic continental slope south west of Ireland
… of mica, and a notable increase in the degree of frosting and pitting of the quartz grains. Overall grain size was finer resulting in a silty sediment package. Sedimentologically the cores fall into two groups (1 and 2). The major difference being that Group 1 (located on the Pendragon Escarpment) …
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Dynamic modeling and simulation of frost and defrost conditions for refrigeration systems
… decisions through a greater understanding of frosting behavior and its effect on system performance. Such insight is achieved by means of developed frost growth and melt models discussed in the first part of this thesis. Validation results demonstrate good prediction capability of both frost …
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Identifying droplet boundaries: impacts of surface topography on droplet freezing and an investigation of the impacts of surfactant on sprayed droplet dynamics
… can cause a wide variety of problems, including frosting on windshields; icing on wind turbines and airplanes; and freezing of heat pipes, thereby reducing their ability for thermal management. Droplets also form from spray break up (e.g., irrigation and pesticides), which are critical for …
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