Experimental Investigation on Flow Characteristics of Supercritical CO₂ in a Helically Coiled Tube

Abstract:

Under the background of global warming, carbon dioxide among natural refrigerants has attracted considerable attention as an alternative refrigerant. In the present study, experimental investigations of the fluid flow characteristic of supercritical CO₂ in a helically coiled tube with the inner diameter 9.0 mm, coil diameter 283 mm and coil pitch 32 mm were carried out. Both frictional pressure drop and friction factor were obtained under the pressure of 8.0 MPa, mass flux from 0 to 600 kg/m²s and inner heat flux from 0 to 20 kW/m². The results indicate that inner wall heat flux and mass flux had significant effects on fluid flow characteristics. The study provides experimental data that could be used for the design and development of more efficient exchangers for refrigeration conditioning, heat pump and some other systems.

• Periodical: Applied Mechanics and Materials (Volumes 368-370)
• Pages: 631-635
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.368-370.631
• Online since: August 2013
• Authors: Shu Xiang Wang, Wei Zhang, Jin Liang Xu
• Keywords: Friction Factor, Helically Coiled Tube, Pressure Drop, Supercritical CO₂

References

[1] L. Lorentzen: Int. J. Refrigeration Vol. 17 (1994), p.292.

[2] P. Nuksa, H. Reksta, G.R. Zakeri and P.A. Schiefloe: Int. J. Refrigeration Vol. 21 (1998), p.172.

[3] K. Klöcker, E.L. Schmidt and F. Steimle: Int. J. Refrigeration Vol. 24 (2001), p.100.

[4] A. Cioncolini and L. Santini: Exp. Therm Fluid Sci. Vol. 30 (2006), p.653.

[5] C.M. White: Proc. Roy. Soc. A Vol. 123 (1929), p.645.

[6] H. Ito: ASME J. Basic Eng. Vol. 81 (1959), p.123.

[7] J.P. Meyer and J.A. Olivier: Int. J. Heat Mass Transfer Vol. 54 (2011), p.1587.