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The role of capillaries in a dilution refrigerator
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[QUOTE="Foreverlearning, post: 6009153, member: 646817"] I've been trying to understand how dilution refrigerators work and inbetween intermediate steps, between different temperature points, I see capillaries here and there under the name of impedances. After some googling, I somewhat convinced myself that it's to build up pressure before and after the capillary to prevent liquid He from reevaporation. But it still isn't crystal clear to me what the capillaries are exactly doing. Considering the Bernoulli's equation, the pressure inside the capillary is less than the pressure before and after, I believe. Are the pressure values exactly the same before and after the capillary (impedance)? Are capillaries just there in various phases of the cooling process just to keep the pressure high to prevent He from evaporating? The links below are some of the references I read before posting the question. http://dicarlolab.tudelft.nl/wp-content/uploads/2012/10/Pobell_3rdEd_Ch7_The3He%E2%80%934He-DilutionRefrigerator.pdf [URL]http://www.roma1.infn.it/exp/cuore/pdfnew/Fridge.pdf[/URL] [/QUOTE]
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The role of capillaries in a dilution refrigerator
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