2002/05/10 by S. M. Liao, Shengming Liao, T. S. Zhao +1
Engineering · #Heat Transfer and Optimization #Heat transfer and supercritical fluids #Thermodynamic and Exergetic Analyses of Power and Cooling Systems
paper · doi:10.1115/1.1423906
crossref issued 2002/05/10 · crossref published 2002/05/10 · crossref published-online 2002/05/10 · openalex publication_date 2002/05/10 · crossref published-print 2002/06/01 · crossref created 2002/07/27 · crossref deposited 2022/02/14 · openalex created_date 2025/10/10 · crossref indexed 2026/07/30 · openalex updated_date 2026/07/31
Abstract Heat transfer from supercritical carbon dioxide flowing in horizontal mini/micro circular tubes cooled at a constant temperature has been investigated experimentally. Six stainless steel circular tubes having inside-diameters of 0.50 mm, 0.70 mm, 1.10 mm, 1.40 mm, 1.55 mm, and 2.16 mm were tested. Measurements were carried out for the pressures ranging from 74 to 120 bar, the temperatures ranging from 20 to 110°C, and the mass flow rates ranging from 0.02 to 0.2 kg/min. It is found that the buoyancy effect was still significant, although supercritical CO2 was in forced motion through the horizontal tubes at Reynolds numbers up to 105. The experimental results also indicate that the existing correlations developed in the previous studies for large tubes deviate significantly from the experimental data for the present mini/micro tubes. Based on the experimental data, a correlation was developed for the axially averaged Nusselt number in terms of appropriate dimensionless parameters for forced convection of supercritical carbon dioxide in horizontal mini/micro tubes cooled at a constant temperature.