- #1
coolnessitself
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I've got a very small tube (about .01" outer diameter, I can't recall the inner diameter $D$ at the moment) of length $L$. It's going to run from a helium bath to a near vacuum ($\Delta P$ ). I'm trying to calculate the length of this tube required to get a flow of $\dot{N}$ (in mols or liters for example) of Helium-4 (viscosity $\eta$) through the tube at temp $T=4.2K$. Several equations I've looked at have given drastically different results, and I'm guessing they just fail in this regime of something very small. Anyone know a good model or approx for this type of thing?