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The effect of PAG-type lubricating oil on heat transfer characteristics of supercritical carbon dioxide inside a small size grooved tube were experimental investigated. The mean inner diameter of the grooved tube is 2 mm, with lead angle of 6.3º and average area enlargement ratio of 2.0. Experiments were conducted using supercritical carbon dioxide at pressures from 8 to 10 MPa and mass fluxes from 400 to 1200 kg/m2.s, oil concentration was changed from 0 to 5%. Heat transfer coefficient at oil concentration 1% was found decreased 30-50% from the value of oil free condition, and 50-70% decrease was found when oil concentration increased to 3%. However, there is no different in heat transfer coefficient at oil concentration between 3 and 5%, showing a saturation phenomenon with increasing oil concentration. Compared to smooth tube, the heat transfer coefficient increased almost twice at different oil concentration conditions, which was considered the effect of the enlargement in heat transfer surface.
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Pages: 2009-5
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- Original title: Effect of lubricating oil on cooling heat transfer of supercritical carbon dioxide inside a small size internal grooved tube.
- Record ID : 2009-1979
- Languages: English
- Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
- Publication date: 2009/06/23
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Indexing
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Themes:
Heat transfer;
CO2;
Blends - Keywords: Polyalkylene glycol; Comparison; Microfin tube; Microchannel; Heat transfer; Bare pipe; Binary mixture; Expérimentation; Flow; Transcritical cycle; Refrigerant; Heat exchanger; CO2
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