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Heat Transfer Characteristics and Flow Visualization during Flow Boiling of Acetone in Semi-Open Multi-Microchannels.
- Source :
-
Heat Transfer Engineering . 2019, Vol. 40 Issue 16, p1349-1362. 14p. 1 Illustration, 6 Diagrams, 2 Charts, 8 Graphs. - Publication Year :
- 2019
-
Abstract
- Experimental results of flow boiling characteristics and flow patterns with acetone in two different microchannel heat sinks are presented in this paper. A semi-open microchannel heat sink and a straight microchannel heat sink with 19 parallel microchannels each were designed and tested. The semi-open microchannels have a channel width of 0.8 mm, fin width of 0.4 mm, and pedestal height of 0.2 mm and the straight microchannels have a rectangular cross section of 0.8 mm × 1 mm. The experimental heat fluxes ranged from 0 to 90 kW/m2, vapor quality ranged from 0.05 to 0.5, mass fluxes ranged from 4.34 to 15.62 kg/m2·s and the inlet temperatures were 20 and 30°C, respectively. Compared to those in the straight microchannels, flow boiling heat transfer coefficients can be improved by up to 36.2%. Furthermore, flow patterns were observed with a speed video camera. The flow boiling heat transfer mechanisms are analyzed according to the observed flow patterns. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01457632
- Volume :
- 40
- Issue :
- 16
- Database :
- Academic Search Index
- Journal :
- Heat Transfer Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 137658095
- Full Text :
- https://doi.org/10.1080/01457632.2018.1470296