Time lapse study

This was an early study of mine into how fractionating would work under mean free path (MFP) flow conditions. I ran into it today and posted it. Something bothered me about reviewing the video as I typed out what was happening.

Then it hit me…

The thermometer is a ground glass thermometer suspended in the uptake tube. The thermometer is calibrated as an immersion type thermometer and is generally immersed in the gases on a distillation head. However, once mean free path flow conditions manifest, doesn’t that mean that at best only the tip of the thermometer is being sampled? Even then the sampling would not be continuous as in regular flow conditions.

Question for the community - is a thermometer that is placed in an MFP environment capable of providing any meaningful temperature information in regards to gas temperature? The more I ponder… how could it be?


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