Abstract
This chapter discusses the influence of fountain pressure on heat transfer. To superfluid helium. Coating wire using porous materials with appropriate pore size is a simple way to get pressurized superfluid (HeIIp) inside porous coating of solid immersed in HeIIs bath. The mechanism results from the thermo-mechanical effect of superfluid, which creates fountain pressure, and allows liquid to become subcooled. The improvement on heat transfer by the method is obviously observed in experiments. A physical model describing fountain pressure inside porous layer is abstracted and the correlation of fountain pressure to the geometric parameters of porous materials is established. The fountain pressure is measured experimentally by means of a Siemens pressure transducer. In this model, by means of thermo-mechanical effect, a fountain pressure is set up in HeIIs bath through porous materials. Fountain pressure allows saturated helium II to become subcooled and heat transfer is thus improved. The existence of fountain pressure is verified theoretically and experimentally, moreover the geometric factors affecting fountain pressure are found and the relation between them are obtained.
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