Observe "sweating" or "frost" on the cold box wall. The frosted area is below the leakage point. Why?
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Observe "sweating" or "frost" on the cold box wall. The frosted area is below the leakage point. Why?
I think it's because the cold stuff is heavier and moves downward.
Low-temperature liquids retain certain characteristics of water (water flows downward). The liquid that has just left the leakage point has not yet vaporized, so it all flows downward. When it leaks for a certain period of time, vaporization will occur. Basically, all the liquid vaporizes below the leakage point, absorbing a large amount of heat and reducing the surrounding temperature. Therefore, frost or sweat can be seen on the cold box plate, and the location is lower than the leakage point.
Because among the three states of matter, liquid is denser than gas and has to flow downwards. The moisture in the air solidifies and frosts when exposed to low temperatures, so the frosted area is below the leakage point.
That is to say, the leak can only be judged when the leakage is slightly larger. If the leakage is small, or there will be sweating due to gaseous leakage, where will it be?