Cryogenic frosting is a common phenomenon in the field of aerospace industry. However, for the case that the cryogenic surface is cooled from room temperature, such as a cryogenic propellant fueling to an uninsulated cryogenic tank, the frost formation process could be unique. In this paper, the density and thermal conductivity of frost deposited on the cold surface cooled from room temperature to cryogenic temperature were experimentally investigated under forced condition. Weighting method was adopted to measure the final frost density at the end of each experiment, and frost thermal conductivity distribution inside the frost layer was obtained by analyzing the temperature profile measured at different heights. The results show that the final frost density increases with air velocity and air absolute humidity and varies from 54.7 to 556.7 kg/m3 in this study. The cooling rate in the initial cooling process exerts a certain effect on the frost structure, which could be observed by the variations of frost density. The frost thermal conductivity is layered along the thickness direction of the frost layer, but the thermal conductivity value, which has been formed at a certain height, does not change significantly with time. Moreover, correlations of frost density and frost thermal conductivity are established with ambient temperature, ambient humidity, and incoming air velocity as variables. Compared to the experimental data, the deviations of the predicted frost density and frost thermal conductivity are both within 10%. The present study could deepen the understanding on frost features in cryogenic conditions, and the established correlations provide reliable tools of estimating frost properties, which are beneficial to the design of cryogenic propellant fueling process.
Experimental Investigation on Frost Density and Thermal Conductivity Under Cryogenic Condition
Springer Aerospace Techn.
International Conference on Advanced Unmanned Aerial Systems ; 2023 ; Harbin, China July 14, 2023 - July 16, 2023
2024-02-01
14 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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