Experiments on Sublimation Behavior of Dry Ice

This article proposes experimental studies on the sublimation behavior of dry ice in a airtight columniform container of Ф 159×840mm. Four typical processes are analyzed under the conditions of heat-preservation, heat transferring, air and airlessness respectively. As a result, a thermo pressure curve of the sublimation process of dry ice is achieved in the experiment. Meanwhile, a conclusion can be drawn with the increase of the pressure, the temperature increases during the course of the dry ice sublimating. Besides, the authors also find that the CO 2 gas produced in the sublimation of dry ice presents an obvious phenomenon of thermo-stratification in the vertical direction.