Frontiers of Chemical Science and Engineering >
Characterization of micro-mixing in a novel impinging streams reactor
Received date: 13 Aug 2008
Accepted date: 18 Oct 2008
Published date: 05 Mar 2009
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This paper presents an experimental investigation of a novel impinging stream reactor (ISR) with the aim of high mixing intensity. The integral mixing quality in the reactor was measured with the iodide-iodate reaction and showed excellent mixing performance. The impact of the operating parameters, such as fluxes, circulation and inter-nozzle distances, was investigated in terms of segregation index. The results showed that the increase of flux, the decrease of inter-nozzle distance and a suitable circulation can improve the micro-mixing efficiency. Based on turbulence theory, it was estimated that the characteristic micro-mixing time was 0.002—0.02 s, which was much shorter than that in the stirred tank reactor. The micro-mixing time was related to the segregation index, which was in good agreement with those in the literature.
Key words： micro-mixing; impinging streams reactor; turbulent mixing; mass transfer
Hui HU , Zhiming CHEN , Zhen JIAO . Characterization of micro-mixing in a novel impinging streams reactor[J]. Frontiers of Chemical Science and Engineering, 2009 , 3(1) : 58 -64 . DOI: 10.1007/s11705-009-0106-8
| 1 |
Ji L J, Liu H F, Wang F C, Yu Z H. Residence time distribution of impinging stream reactor. Journal of East China University of Science and Technology, 2006, 32(1): 24-27 (in Chinese)
|
| 2 |
Wang S J, Mujumdar A S. Three-dimensional analysis of flow and mixing characteristics of a novel in-line opposing-jet mixer. Ind Eng Chem Res, 2007, 46: 632-642
|
| 3 |
Florian S, Johannes G, Hans C S, Wolfgang P, Michael M. The low Reynolds number turbulent flow and mixing in a confined impinging jet reactor. Int J Heat and Fluid Flow, 2007, 28: 1429-1442
|
| 4 |
Xiao Y, Chen Y, Wu Y. Determining micro-mixing characteristic time constant in SCISR with azo coupling reaction. Journal of South-Central University for Nationalities, 2005, 24(2): 5-8 (in Chinese)
|
| 5 |
Ou Yang C B, Liu Y Z, Qi G S, Yang L R. Function study on micro mixing in impinging stream-rotating packed bed reactor. Applied Chemical Industry, 2003, 31(5): 22-24
|
| 6 |
Norbert K, Thomas K, Michael E, Peter W. Convective mixing and chemical reactions in microchannels with high flow rates. Sensors and Actuators B, 2006, 117: 495-508
|
| 7 |
Fournier M C, Falk L, Villermaux J. A new parallel competing reaction system for assessing micro-mixing efficiency: experimental approach. Chemical Engineering Science, 1996, 52(22): 5053-5064
|
| 8 |
Zhang J W. Study of the flow field characteristic of submerged circulative impinging stream reactor. Dissertation for the Doctoral Degree. Shenyang: Northeast University, 2004, 20-22 (in Chinese)
|
| 9 |
Guichardon P, Falk L. Characterisation of micro-mixing efficiency by the iodide-iodate reaction system. Part I: experimental procedure. Chemical Engineering Science, 2000, 55: 4233-4243
|
| 10 |
Palmer D A, Ramette R W, Mesmer R E. Triodide ion formation equilibrium and activity coefficients in aqueous solution. Journal of Solution Chemistry, 1984, 13(9): 673-683
|
| 11 |
Allen T L, Keefer R M. The formation of hypoiodous acid and hydrated iodine cation by the hydrolysis of iodine. J Am Chem Soc, 1955, 77: 2957-2960
|
| 12 |
Wei Y J, Liu C G, Mo L P. Ultraviolet absorption spectra of iodine , iodide ion and triiodide ion. Spectroscopy and Spectral Analysis, 2005, 25(1): 86-88 (in Chinese)
|
| 13 |
Bourne J R, Martin S. Fast reaction in rotor-stator mixers of different size. Chemical Engineering and Progressing, 1992, 31: 285-296
|
| 14 |
Zhao Y C, Ying Y, Chen G W, Yuan Q. Characterization of micro-mixing in T-shaped micro-mixer. Journal of Chemical Industry and Engineering, 2006, 57(8): 1884-1890 (in Chinese)
|
| 15 |
Baldyga J, Bourne J R. Comparison of the engulfment and the interaction-by-exchange-with-the-mean micro-mixing models. Chemical Engineering Journal, 1990, 45(1): 25-31
|
| 16 |
Liu P D, Futran M, Midler M, Paul E L. Particle size design of pharmaceuticals by continuously impinging jets precipitation. AIChE Meeting, Chicago, 1990
|
| 17 |
Amarjit J M, Donald J K. Micromixing effects in a two-impinging-jets precipitator. AIChE Journal, 1996, 42(7): 1801-1814
|
| 18 |
Tamir A. Impinging stream reactor-fundamentals and application. Amsterdam: Elsevier, 1994: 39-54
|
| 19 |
Tamir A. Processes and phenomena in impinging-stream reactors. Chemical Engineering Progress, 1989, 85 (9): 53-61
|
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