Abstract
We consider the flow of normal 3He in aerogel in the temperature regime T c⩽ T⪡ T F. A recent phenomenological treatment that predicted the transition from Drude to Hagen–Poiseuille flow at low T and low aerogel concentration, was restricted to small Knudsen numbers λ ∗/d ( λ ∗= quasiparticle mean free path of 3He in aerogel, d= sample dimension), the so-called slip regime. In this contribution we lift this restriction and present a variational calculation, valid at arbitrary Knudsen numbers. We calculate the slip length of liquid 3He in aerogel and predict the temperature dependence of the flow resistance in this general situation.
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