干冰升华特性的实验

Experiments on Sublimation Behavior of Dry Ice

对干冰在尺寸为Ф159mm×840mm的圆柱体密闭容器中进行了绝热条件与有热交换、有空气与排出空气这4种过程的升华实验,获得了干冰升华过程的温度—压力曲线。结果表明:在干冰升华的过程中,随着压力的上升,温度也随之上升;同时,干冰升华所产生的二氧化碳气体在竖直方向上存在着明显的温度分层现象。

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.