Abstract
Steady state and transient heat transport characteristics of He II channels have been investigated experimentally. Two parallel He II channels are separated by a spacer. Four kinds of spacer materials have been tested. One of them is FRP and the others are porous materials which can induce the fountain effect. The heat transport characteristics for these spacers were compared in the present study. Porous spacer equipped He II channels have a superior cooling performance compared with FRP spacer equipped channels. Porous spacers are effective for increasing the λ transition heat flux, even a micro porous film of only 40 μm in thickness. Porous spacers are also effective to delay the initiation of the λ transition in the He II channel. An alumina spacer is especially attractive to suppress the helium temperature even after the λ transition occurs.
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