Counter-current air-water flow in narrow rectangular channels with offset strip fins
- Authors
- Kim, BJ; Sohn, BH; Koo, KK
- Issue Date
- Mar-2003
- Publisher
- KOREAN SOC MECHANICAL ENGINEERS
- Keywords
- counter-current two-phase flow; narrow rectangular channel; offset strip fins; flow regime; void fraction; two-phase pressure gradient
- Citation
- KSME INTERNATIONAL JOURNAL, v.17, no.3, pp.429 - 439
- Journal Title
- KSME INTERNATIONAL JOURNAL
- Volume
- 17
- Number
- 3
- Start Page
- 429
- End Page
- 439
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/25995
- DOI
- 10.1007/BF02984369
- ISSN
- 1226-4865
- Abstract
- Counter-current two-phase flows of air-water in narrow rectangular channels with offset-strip fins have been experimentally investigated in a 760 mm long and 100 min wide test section with 3.0 and 5.0 min gap widths. The two-phase flow regime, channel-average void fractions and two-phase pressure gradients were studied. Flow regime transition occurred at lower superficial velocities of air than in the channels without fins. In the bubbly and slug flow regimes, elongated bubbles rose along the subchannel formed by fins without lateral movement. The critical void fraction for the bubbly-to-slug transition was about 0.14 for the 3 mm gap channel and 0.2 for the 5 min gap channel, respectively. Channel-average void fractions in the channels with fins were almost the same as those in the channels without fins. Void fractions increased as the gap width increased, especially at high superficial velocity of air. The presence of fins enhanced the two-phase distribution parameter significantly in the slug flow, where the effect of gap width was almost negligible. Superficial velocity of air dominated the two-phase pressure gradients. Liquid superficial velocity and channel gap width has only a minor effect on the pressure gradients.
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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