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In this study, the heat transfer characteristics of supercritical carbon dioxide cooled inside a small size grooved tube are experimentally investigated. The mean inner tube diameter, fin height, and helix angle are 2 mm, 0.15 mm, and 6.3º, respectively. The average area enlargement ratio is 2.0. The experiments are carried out using supercritical carbon dioxide at pressures in the range of 8-10 MPa and mass fluxes in the range of 400-1200 kg/m2.s. The results show that rate of increase in the heat transfer coefficient and the pressure drop for the grooved tube is twice that of a smooth tube with the same mean inner diameter; the higher rate can be attributed to the increase in the heat transfer area. The prediction model for smooth tubes can also be applied for grooved tubes with a small helix angle if the area enlargement ratio is considered.
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Details
- Original title: Heat transfer characteristics of supercritical carbon dioxide cooled inside small size grooved tube.
- Record ID : 2009-0080
- Languages: English
- Source: 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
- Publication date: 2008/09/07
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Indexing
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Themes:
Heat transfer;
CO2 - Keywords: Geometry; Tube; Heat transfer; Gas cooler; Parameter; Expérimentation; Transcritical cycle; Heat exchanger; CO2; Pressure drop
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