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题名: Modelling of self-induced oscillations in the mixing head of a rim machine
作者: Li, Xiaojin;  Santos, Ricardo J.;  Lopes, Jose Carlos B.
关键词: modelling ;  self-induced oscillations ;  pressure fluctuation ;  frequency
刊名: CANADIAN JOURNAL OF CHEMICAL ENGINEERING
发表日期: 2007-02-01
卷: 85, 期:1, 页:45-54
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: in this paper, the self-induced oscillations in the mixing head of a RIM machine were modelled. An analytical and simple correlation was derived between the Strouhal number and the averaged pressure drop along the amplitude of the oscillation in the mixing chamber. This correlation theoretically identified that the frequency of the oscillations could be well correlated by the jet Reynolds number, Red, and the dimensionless distance between the two jets as proposed by Denshchikov et al., Fluid Dyn. 3, 460-462 (1983). The flow field dynamics in the mixing head was simulated successfully by Fluent and the computed pressure fluctuations were used to calculate the frequencies of the oscillations in the mixing head. The calculated Strouhal numbers are in good agreement with the dominant frequency from the power spectra of the measured velocity component u(x) (Santos, 2003). Finally, the effect of Re(d) and Froude number, Fr, on the Strouhal number was investigated in the impingement region. The average Strouhal number showed a decrease with the Reynolds numbers, due to the increasing randomness of flow field in the impingement region. It was also found that the operations at lower values of Fr presented an increasing stability up to the point where the system is unable to present dynamic evolution. The model in this paper provides a theoretical starting point towards understanding of the quantities of the oscillatory flow in the mixing head, as well as a numerical approach to evaluate the dominant frequency in the mixing chamber.
关键词[WOS]: SUSTAINED OSCILLATIONS ;  SHEAR LAYERS ;  FLOW ;  PLATE ;  TONE
语种: 英语
WOS记录号: WOS:000244620500004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140580
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Univ Porto, Fac Engn, Dept Chem Engn, Lab Separat & React Engn, P-4200465 Oporto, Portugal
2.Dalian Inst Chem Phys, Dalian 116023, Liaoning Prov, Peoples R China

Recommended Citation:
Li, Xiaojin,Santos, Ricardo J.,Lopes, Jose Carlos B.. Modelling of self-induced oscillations in the mixing head of a rim machine[J]. CANADIAN JOURNAL OF CHEMICAL ENGINEERING,2007,85(1):45-54.
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