Study on Specifics of Forced Convective Heat Transfer in Supercritical Carbon Dioxide

Abstract

The appropriate description of heat transfer to coolants at the supercritical state is limited by the current understanding. Thus, this poses one of the main challenges in the development of supercriticalfluids applications for GenerationIV reactors. Since the thermodynamic critical point of water is much higher than that of carbon dioxide (CO2), it is more affordable to run heattransfer experiments in supercritical CO2. The data for supercritical CO2 can be later scaled and used for supercritical waterbased reactor designs. The objective of this paper is, therefore, to discuss the basis for comparison of relatively recent experimental data on supercritical CO2 obtained at the facilities of the Korea Atomic Energy Research Institute (KAERI) and Chalk River Laboratories (CRL) of the Atomic Energy of Canada Limited (AECL). Based on the available instrumental error, a thorough analysis of experimental errors in walland bulkfluid temperatures and heat transfer coefficient was conducted. A revised heattransfer correlation for the CRL data is presented. A dimensional criterion for the onset of the deteriorated heat transfer in the form of a linear relation between heat flux and mass flux is proposed. A preliminary heattransfer correlation for the joint CRL and KAERI datasets is presented.