Pool Boiling Heat Transfer on Fine Thin Wire in Nitrogen-Tetrafluoromethane Mixtures

Abstract

Nucleate and film pool boiling heat transfers, critical heat fluxes, and minimum heat fluxes for nitrogen, tetrafluoromethane, and their mixtures have been measured on a fine thin wire. The orientation of wire was horizontal and vertical. Critical heat fluxes and minimum heat fluxes for mixtures were in concentrations larger than those for either pure component. The heat flux in nucleate boiling regime for mixtures was explained well by the experimental formula. Transition behavior from nucleate boiling to film boiling has been observed for step current heat input and rapid heating. It was found that there was no transition behavior for mixtures in comparision with the pure component. The nitrogen-tetrafluoromethane mixtures should be used for cryogens of oxide superconductors having critical temperature more than 110K.