dc.contributor.author |
Jeong, Siyoung
|
|
dc.contributor.author |
Park, Dongho
|
|
dc.date.accessioned |
2014-07-18T08:58:49Z |
|
dc.date.available |
2014-07-18T08:58:49Z |
|
dc.date.issued |
2007 |
|
dc.description.abstract |
Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007. |
en_US |
dc.description.abstract |
Recent studies on evaporation of carbon dioxide in micro-channels reported that the heat transfer coefficient decreased drastically with increasing quality. To improve the evaporating heat transfer characteristics a grooved multi-channel micro-tube was suggested in this study, and the evaporating heat transfer characteristics have been experimentally investigated. The multi-channel aluminum tube, which is directly heated by the electricity, has 8 channels with a diameter of 0.8mm and a length of 1.1m. Each channel has eight micro-grooves with the width of 0.2mm and depth of 0.1mm. The heat transfer coefficients were measured in the range of heat fluxes from 12 to 18 kW/m2; mass fluxes 400 – 800 kg/m2s; evaporative temperature 5℃; and qualities from zero to superheated state. The measured values were compared with those in the plain multi-channel micro-tubes with the same diameter. The heat transfer coefficient was found to be increased at low qualities (x < 0.4). At high qualities, the sudden drop of the HTC due to the dry-out phenomena was not improved. In the evaporation process of CO2, the grooves applied to microchannels have a noticeable effect only in low quality regions. |
en_US |
dc.description.librarian |
cs2014 |
en_US |
dc.format.extent |
5 pages |
en_US |
dc.format.medium |
PDF |
en_US |
dc.identifier.citation |
Jeong, S & Park, D 2007, 'Evaporative heat transfer of CO2 in a grooved multi-channel micro-tube', Paper presented to the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July 2007. |
en_US |
dc.identifier.isbn |
9781868546435 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/40861 |
|
dc.language.iso |
en |
en_US |
dc.publisher |
International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics |
en_US |
dc.relation.ispartof |
HEFAT 2007 |
|
dc.rights |
University of Pretoria |
en_US |
dc.rights.uri |
University of Pretoria |
en_US |
dc.subject |
Evaporation of carbon dioxide in micro-channels |
en_US |
dc.subject |
Grooved multi-channel micro-tube |
en_US |
dc.subject |
Microchannels |
en_US |
dc.subject |
Heat transfer coefficient |
en_US |
dc.subject |
Heat transfer of CO2 |
en_US |
dc.title |
Evaporative heat transfer of CO2 in a grooved multi-channel micro-tube |
en_US |
dc.type |
Presentation |
en_US |