期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 55, 期 1, 页码 107-115出版社
ELSEVIER
DOI: 10.1016/j.supflu.2010.08.005
关键词
Supercritical extraction; Heat transfer; Kenics static mixer; Computational fluid dynamics
资金
- Fundacao para a Ciencia e Tecnologia [POCTI/EME/61713/2004, SFRH/BD/19243/2004]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/19243/2004] Funding Source: FCT
The thermal efficiency of a Kenics (R) KM static mixer used to pre-heat supercritical carbon dioxide, under high pressure conditions, is studied using computational fluid dynamics (CFD). A mesh sensitivity analysis is performed and the CFD model is validated against experimental results on heat transfer with conventional and supercritical fluids. Three turbulent models - standard k-epsilon, RNG k-epsilon, and k-omega - are employed to model the flow and heat transfer under high pressure conditions: the effects of large variations of the physical properties in the pseudo-critical region of the fluid are also studied. The RNG k-e model gives results that are closer to the experimental data than the other two turbulence models. The numerical results show that the static mixer has a thermal efficiency more than three times higher than that of a conventional empty pipe heat exchanger with similar heat transfer area. (C) 2010 Elsevier B.V. All rights reserved.
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