Intensity of heat transfer in thermostatic control of cryogenic equipment with supercritical helium

Abstract

This article analyzes the experimental data and calculation relationships for determining the intensity of heat transfer in the forced movement of supercritical helium in channels of small diameter. Heat exchange in supercritical helium depends on the variation of the thermal properties of helium in the supercritical state. The intensity of heat transfer to supercritical helium is high and exceeds, in some cases, the intensity of heat transfer to boiling helium in channels. The reduction in the intensity of heat transfer in the specific region of the supercritical state at 0.25 MPa is less marked than the transition from bubble to film boiling. A dependence for generalizing the experimental data on heat transfer to supercritical helium for small changes in the thermal properties in the cross section of the flow is considered.