Forced convection boiling heat transfer of CO{sub 2} in horizontal tubes
From ozone depletion and global warming (ODP and GWP) viewpoints, natural refrigerants offer a clear advantage over CFCs and their substitutes. Here, an experimental investigation is performed to study the forced convection boiling heat transfer of CO{sub 2} in a smooth tube. Tests are conducted in a horizontal stainless steel tube. The tube has an inner diameter of 6.00 mm, wall thickness of 1.00 mm, and length of 1.78 m. Heat to the test section is provided by a heating wire wrapped around the tube. Experiments are conducted with lubricant-free CO{sub 2} at saturation temperature of 283 K, mass fluxes of 160 to 320 kg/m{sup 2}s, heat fluxes of 10 to 20 kW/m{sup 2}, and inlet quality of 5% to 60%. The heat transfer coefficients of CO{sub 2} increase with increasing the heat and/or mass flux. For the test conditions considered, the vapor quality had an adverse effect on the heat transfer coefficients. The present experimental data are found to be close to the results predicted by Gungor and Winterton (1987) with the mean deviation of less than 10%. The experimental data are correlated and the results are discussed.
- Research Organization:
- Univ. of Maryland, College Park, MD (US)
- OSTI ID:
- 20026812
- Resource Relation:
- Conference: 5th ASME/JSME Thermal Engineering Joint Conference, San Diego, CA (US), 03/14/1999--03/19/1999; Other Information: 1 CD-ROM. Operating system required: Windows i386(tm), i486(tm), Pentium (R) or Pentium Pro, MS Windows 3.1, 95, or NT 3.51, 8 MB RAM, MacIntosh and Power MacIntosh with a 68020 or greater processor, System software version 7.1, 3.5 MB RAM (5 MB for PowerMac) 6 MB available hard-disk space, Unix; PBD: 1999; Related Information: In: Proceedings of the 5th ASME/JSME thermal engineering joint conference, [3600] pages.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Turbulent heat transfer in supercritical carbon dioxide in a heated horizontal tube
Two-phase flow heat transfer and pressure drop characteristics of R-22 and R-32/125