An Experimental Investigation of Free Convection Heat Transfer in Supercritical Helium

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Department of Mechanical Engineering-Engineering Mechanics


An experimental study of free convection heat transfer from a copper sphere to supercritical helium is presented. The heat-transfer coefficient is measured in the transposed critical line region covering pressures from 2.3-35 atm (0.23-3.55 MPa) and temperatures from 5.3 to 25 K. Empirical correlations accurate to ±20% between Nu, Pr, Gr, pb, Δp, Tb and ΔT are obtained. A boiling-like phenomenon is observed experimentally near the critical point in that the heat-transfer coefficient h increases with temperature difference ΔT until h reaches a maximum after which h decreases for larger ΔT.

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© 1980

Publication Title

International Journal of Heat and Mass Transfer