Abstract
The surface superheats at incipient boiling and critical heat flux (CHF) due to transient heat inputs have been measured on horizontal gold cylinder surface with a diameter of 1.0mm. Measurements were made under a wide range of pressures and subcoolings ranged from atmospheric up to 1082kPa and from saturated condition up to 140K, respectively. It was observed in high subcooling that the incipient boiling surface superheat, ΔT_i, is higher than the CHF surface superheat, ΔT_c, The ΔT_i and ΔT_c for direct transition and semi-direct transition processes show an almost constant value. It was found also that the incipient boiling and CHF surface superheats are dependent on subcooling.
