Abstract
The forced convection heat transfer coefficients were measured on a horizontal flat plate heater located on inner wall of a rectangular duct for pressures from 1 atm to 2.8 atm, flow velocities up to 2.1 m/s and for liquid temperatures from 1.8 to 6.5 K. Critical heat fluxes (CHFs) in He II under subcritical and supercritical pressures are higher for higher flow velocity and lower liquid temperature. In He I under supercritical pressures, there are two distinct ranges in heat transfer curves. The curve for lower heat flux range has a steeper gradient and the curve for higher heat flux has a lower gradient like film boiling regime. The peak heat fluxes of the former curves are treated as pseudo CHFs in this study and compared with the CHFs for He II.
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