Abstract
Engineering applications of superfluid helium (HeII) has been focused on by cryophysical and cryogenic researcher after the superconducting magnet has been successfully cooled by superfluid helium, several kinds of subcooled superfluid helium cryostat have been successively developed. This chapter discusses the influence of various types of pressures (bath pressure, hydrostatic head, Van-derwaals pressure and fountain pressure) on the heat transfer in a bath of HeII. If the bath pressure is less than λ-Pressure (P λ), special peak heat flux density relations are shown to correlate bath pressure, hydrostatic head and modified pressure items (Van-der-waals pressure and fountain pressure). If the bath pressure is greater than λ –pressure (P>P λ), a generalized formula of peak flux density of pressurized superfluid (HeIIp) bath is addressed in the chapter.
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