Abstract
Heat transfer from technical copper to flowing He II has been investigated for heat fluxes of 0.1 to 2.5 W/cm2 and for flow velocities up to 1.5 m/s. Experiments were carried out at a constant temperature at the inlet of a 1 m long test section as well as at constant heat flux and at a constant fluid temperature near the heater to provide more general data. For comparison the range of the fluid temperature was extended into the He I-region whenever the experimental conditions allowed for it. It is found that in the He II-region the heat transfer coefficient increases both, with increasing heat flux and with increasing fluid temperature and it does not depend on the helium flow velocity. When crossing TΛ the heat transfer coefficient is reduced to about 30% of its previous value. A numerical relation is given to estimate the heat transfer coefficient as a function of heat flux and fluid temperature.
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