Entrainment of non-volatile solids in sublimation at reduced pressure
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
A fundamental analysis of some of the factors affecting entrainment in sublimation is proposed and the predictions are verified experimentally by investigation of the separation of particulate silicon carbide from ammonium chloride. It was found that for the impurity particle size distribution studied, increased system pressure is effective in reducing entrainment at a given mass rate of sublimation. The separation is also improved at a given pressure by sublimation at lower rate. The sublimation rate was found to be a function of temperature and pressure. The temperature necessary to initiate sublimation is approximately the temperature at which the vapor pressure of ammonium chloride is equal to the system pressure. Above this initiation temperature, the sublimation rate increases linearly with temperature.