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Experimental study on cooling heat transfer of supercritical carbon dioxide flowing in horizontal grooved tubes.
Author(s) : KOYAMA S., HIGAHIIUE S., KUWAHARA K., et al.
Summary
In this study, experimental study on cooling heat transfer of pure CO2 flowing in horizontal grooved tubes was carried out under supercritical pressure conditions. The heat transfer coefficients were measured for four different shapes of grooves in test tubes at 8 and 10 MPa in pressure and 360-690 kg/(m2.s) in mass velocity. The ranges of the geometrical parameters in the grooved tubes are 4.76 to 5.11 mm in average inner diameter, 0.15 to 0.24 mm in depth of groove, 5 to 25 degrees in helix angle, 46 to 52 in number of grooves and 1.4 to 2.3 in area expansion ratio. While the available correlation equation of the heat transfer coefficient for the grooved tubes, which were developed for single-phase turbulent fluid flow, showed similar trends in comparison to those of the data on the variation of Reynolds number and fin shapes, its predicted results greatly deviated from the almost all of measured values. In order to improve the prediction method for the cooling heat transfer coefficient of supercritical carbon dioxide, the new correlation was developed empirically based on measured data and this correlation predicted almost all of the measured heat transfer coefficients within plus or minus 20%.
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Pages: ICR07-B1-1023
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Details
- Original title: Experimental study on cooling heat transfer of supercritical carbon dioxide flowing in horizontal grooved tubes.
- Record ID : 2007-2485
- Languages: English
- Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
- Publication date: 2007/08/21
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Indexing
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Themes:
Heat transfer;
CO2 - Keywords: Horizontal tube; Ribbed tube; Heat transfer; Expérimentation; Flow; Transcritical cycle; Refrigerant; CO2
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