کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
656430 | 1458043 | 2016 | 13 صفحه PDF | دانلود رایگان |
• Empirical model developed for reseal pressure for cryogenic liquid acquisition devices.
• 4815 room temperature and cryogenic reseal data points gathered.
• Trends in cryogenic reseal pressure are identified and examined.
• Screen type, liquid temperature and pressure, and pressurant gas type and temperature are primary factors.
• Mean absolute error between data and new model is 2.4%.
Inside a propellant tank in microgravity, surface tension forces dominate, and porous screen channel liquid acquisition devices (LADs) are required to separate fluid phases, control flow, and ensure vapor free liquid transfer out of the tank. The bubble point pressure based on Adamson and Gast (1997) and reseal pressure of the screen define LAD performance. This paper presents a predictive equation for modeling the reseal pressure in both storable as well as cryogenic liquids. Seven parameters affect the reseal pressure, including surface tension (liquid type), contact angle, screen reseal diameter, liquid temperature, degree of subcooling, and pressurant gas type and temperature. Decreasing the temperature decreases reseal pressure. Pressurization with a non-condensable gas always yields higher reseal points over pressurization with a condensable gas. Subcooling the liquid at the screen adds margin in reseal point whereas elevating the temperature of the pressurant gas is a degradation factor. The reseal pressure model is validated across a wide range of experimental ground data and the mean absolute error between 4815 data points and model is only 2.4%.
Journal: International Journal of Heat and Mass Transfer - Volume 99, August 2016, Pages 31–43