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Abstract
The work presents the results of experimental investigation on heat transfer in minichannels. Refrigerant R123 was used as a test fluid. Single vertical silver tubes of 380 mm length and 2.3 mm diameter were examined with two variants of turbulising inserts. A wide range of parameters was considered, namely mass flux G=534-3011 kg/(m2s), heat flux qw=28.5-68.4 kW/m2, saturation temperature Tsat=23-86 stC and the full range of vapour quality variation (x=0-1). The effect of mass flux and heat flux on heat transfer coefficient was analysed both for the smooth tube and for two turbulisation variants. The results were compared with popular smooth tube correlations. For the case of a smooth tube the M-shape of heat transfer coefficient curve as a function of quality was observed, which is a completely new finding confirmed in the literature only recently. There are some circumstances of similar existence of two heat transfer coefficient maxima also for the tubes with turbulising inserts. The discussion of flow boiling intensification possibilities in minichannels with the use of this method was based on the number of comparisons of the smooth tube and two turbulisation variants for various established parameters.
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- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijthermalsci.2012.10.002
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
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INTERNATIONAL JOURNAL OF THERMAL SCIENCES
no. 65,
pages 79 - 91,
ISSN: 1290-0729 - Language:
- English
- Publication year:
- 2013
- Bibliographic description:
- Mikielewicz D., Klugmann M., Wajs J.: Flow boiling intensification in minichannels by means of mechanical flow turbulising inserts// INTERNATIONAL JOURNAL OF THERMAL SCIENCES. -Vol. 65, (2013), s.79-91
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijthermalsci.2012.10.002
- Verified by:
- Gdańsk University of Technology
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