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In this paper, the evaporating heat transfer and pressure drop characteristics of carbon dioxide has been experimentally investigated in a multichannel microtube. The aluminum tube, which is directly heated by the electricity, has 6 channels with a diameter of 0.8 mm and a length of 1.1 m. The experimental apparatus consists of the test-section, heat exchanger, accumulator, gear pump, mass flowmeter, preheater. The experiments were carried out in various operating conditions. The heat fluxes were in the range of 0-18 kW/m2; the mass fluxes were 400-1000 kg/m2.s; and the evaporation temperature were 0-10°C. It was found that the HTC dropped rapidly if the quality was higher than 0.5 or so. The effect of the mass flux on the HTC was not clear. However, the HTC was increased with the increasing heat flux. It was also slightly increased at higher evaporating temperature. The pressure drops at the same mass flow rate were found to increase with the increasing heat flux and decreasing evaporation temperature.
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Pages: ICR07-B1-1277
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Details
- Original title: Evaporating heat transfer and pressure drop of CO2 in a multichannel microtube.
- Record ID : 2007-2480
- 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;
Mass transfer;
CO2 - Keywords: Microchannel; Heat transfer; Expérimentation; Evaporation; Refrigerant; CO2; Pressure drop
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- Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
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- Date : 2003/04/22
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