Flow pattern transition instability during flow boiling in a single microchannel
SCIE
SCOPUS
- Title
- Flow pattern transition instability during flow boiling in a single microchannel
- Authors
- Huh, C; Kim, J; Kim, MH
- Date Issued
- 2007-03
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- We studied the unique characteristics of flow boiling in a single microchannel, including the periodic pressure drop, mass flow rate, and temperature fluctuations, in terms of a long time period. Experiments were conducted using a single horizontal microchannel and deionized water to study boiling instabilities at very small mass and heat flow rate conditions. A Polydimethylsiloxane (PDMS) rectangular single microchannel had a hydraulic diameter of 103.5 mu m and a length of 40 mm. A series of piecewise serpentine platinum micro-heaters were fabricated on the inner bottom wall of the rectangular microchannel to supply thermal energy to the test fluid. Real-time flow visualizations of the flow pattern inside the microchannel were performed simultaneously with measurements of the experimental parameters. Tests were performed for mass fluxes of 170 and 360 kg/m(2) s and heat fluxes of 200-530 kW/m(2). The test results showed that the heated wall temperature, pressure drop, and mass flux all fluctuated with a long period and large amplitude. These periodic fluctuations exactly matched the transition of two alternating flow patterns inside the microchannel: a bubbly/slug flow and an elongated slug/semi-annular flow. Therefore, the flow pattern transition instability in the single microchannel caused a cyclic behavior of the wall temperature, pressure drop, and mass flux, and this behavior had a very long period (100-200 s) and large amplitude. (c) 2006 Elsevier Ltd. All rights reserved.
- Keywords
- two-phase instability; microchannel; two-phase flow; flow pattern transition; flow boiling; 2-PHASE FLOW; HEAT-TRANSFER; SILICON MICROCHANNELS; MICROFLUIDIC DEVICES; PRESSURE-DROP; POLY(DIMETHYLSILOXANE); CHANNELS; SINKS; WATER; FLUX
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23538
- DOI
- 10.1016/j.ijheatmasstransfer.2006.07.027
- ISSN
- 0017-9310
- Article Type
- Article
- Citation
- INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, vol. 50, no. 5-6, page. 1049 - 1060, 2007-03
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