Rules of thumb for the design length of transition tubes

Are there any rules of thumb for the design length of transition tubes in order to prevent condensation at the room temperature end?

By “transition tube,” I mean some standard size (O.D. and wall thickness) type 304 stainless steel tube with either 4 K or 80 K at one end and room temperature (300 K) convection at the other end.

Basically, what I’m asking is this: Is there some standard relation people use for length depending on the cross-sectional area – one relation for the 4 K case and another for the 80 K case – in order to prevent condensation, and possibly subsequent ice ball formation?

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