General feature of supercritical fluid is discussed putting stress on its flow and heat transfer characteristics. In section 1 history of investigation and technological background are described briefly. Then the definition of supercritical fluid and descriptions on its thermodynamic and transport properties are made in section 2. The singularity and peculiarity of fluid near the critical point are discussed also. General nature of convective process, natural convection and forced convection of supercritical fluid are explained in section 3, 4 and 5 respectively.
The literature on the thermodynamic, electric and transport properties of helium 4 is reviewed. The thermodynamic properties are shown to be calculated using the equations taken from the NBS report. The data on the transport properties- viscosity and thermal conductivity-are assembled, and the NBS data are shown as the reliable values. The electrical properties are also discussed regarding dielectric constant, loss tangent and electrical breakdown.
Experiments relating to supercritical helium heat transfer are reviewed and discussed according to the following modes: 1) heat transfer under natural convection 2) heat transfer under forced convection Correlative expressions are used to compare with experimental data and to predict heat flux at various conditions in further design studies.