Heat Transfer Study on Supercritical CO2 Flow in 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 supercritical CO₂ experimental data was obtained from Chalk River Laboratories (CRL) AECL. Data points were obtained for an upward flow of CO₂ inside 8-mm ID vertical Inconel-600 tube with a 2.208-m heated length for a wide range of flow conditions: 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 that were below, at, or above the pseudocritical temperature.