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Superconducting NMR magnets

Refilling the Liquid Nitrogen jacket of the superconducting magnets at work. Water mist so fine, Rayleigh Scattering makes it look blue. (or is that Tyndall Effect?) Next: b-field pattern stand...  
 
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BdanBlue (2 months ago) Show Hide
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I like your work :)
sbscottmonkey (5 months ago) Show Hide
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Ln2 filling the dangerous way - using plastic hose. It can split when frozen - should use stainless steel braided hose instead.
stefanmckinley (9 months ago) Show Hide
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Oh yeah! that's cool!
7419635841635 (8 months ago) Show Hide
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kworld01 (10 months ago) Show Hide
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kworld01 (10 months ago) Show Hide
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Answer is the electric universe.
twilight1138 (10 months ago) Show Hide
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So, what IS your work ?
wbeaty (10 months ago) Show Hide
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Electronics nerd, in the UW chem dept.
wbeaty (11 months ago) Show Hide
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Yep, LN refill. *Very* cold N2 gas is pushed out, and the entrained humid room air has a condensation cloud.

The blue color implies water droplet size of ~optical wavelength. Probably the immense temperature drop causes spontaneous condensation without nuclei. So rather than few large cloud-droplets, you get many smaller ones (more like molecule clusters than like droplets.)

Fog from the chilled metal looks white: fewer much larger droplets >> 700nM.
wbeaty (11 months ago) Show Hide
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Idea to try: fill some hot wet air with condensation nuclei and pass it over chilled surface. Will the fog still be white?

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