Experimental Study on Supercritical CO₂ and Development of Heat Transfer Correlation for Bare Vertical Tube

Abstract

This paper presents an analysis of a new heat-transfer correlation developed for supercritical carbon dioxide (CO₂) flowing in vertical bare tubes. A large set of experimental data was obtained at Chalk River Laboratories (CRL) AECL. Heat-transfer tests were performed in upward flow of CO₂ inside 8-mm ID vertical Inconel-600 tube with a 2.208-m heated length. Data points were collected at outlet pressures ranging from 7.4 to 8.8 MPa, mass fluxes from 900 to 3000 kg/m²s, inlet fluid temperatures from 20 to 40°C, and heat fluxes from 15 to 615 kW/m²; and for several combinations of wall and bulk-fluid temperatures.