http://worldcat.org/entity/work/id/12944757

Measurements of Combined Axial Mass and Heat Transport in He Ii

An experiment was performed that allowed measurements of both axial mass and heat transport of He-II (the superfluid phase of helium 4) in a long tube. The apparatus allowed the pressure difference and the temperature difference across the flow tube to each be independently adjusted, and the resulting steady-state values of net fluid velocity and axial heat transport to be measured. For the larger Reynolds numbers, the relation between pressure difference and net fluid velocity was nearly indistinguishable from that of an ordinary fluid in turbulent flow. The axial heat transported was suppressed from the values that were calculated by assuming that mutual friction was unchanged by the net fluid flow, but it was always larger than the enthalpy rise value. Taking this second value as a lower limit, a mild extrapolation of these results suggests that (in appropriate circumstances) forced convection would allow much greater heat to be transported in long cooling channels than could be transported by natural convection alone. (Author/BB).

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