Study of mixing and chemical reaction in RIM

Santos, Ricardo J.; Teixeira, André; Lopes, José Carlos B.

doi:10.1016/j.ces.2004.11.050

Cited by 54 publications

(45 citation statements)

References 39 publications

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“…Because of the reduced interaction with the neighboring flow structures it is most likely that the fluid almost trapped in those closed vortices presents extremely high residence times when compared to the chamber average residence time. 16 The overall velocity pattern here identified at Re 5 100 is consistent with the particle paths at the segregated flow regime observed by Wood et al, 13 at Re 5 60.5, and by Unger and Muzzio 19 in a precipitator at Re 5 40.…”

Section: Overall Effect Of the Reynolds Numbersupporting

confidence: 88%

“…Nevertheless the chosen plane is the one where the flow presents the strongest dynamics, 8 and the main mixing mechanisms. 16 The results from both sets of PIV experiments, Set 1 and Set 2, are presented separately. Set 1 experiments are presented first, drawing the general flow-field evolution with the Reynolds numbers between Re 5 100 and Re 5 500.…”

Section: Flow-field Characterizationmentioning

confidence: 99%

“…This flow regime is best visualized from particle studies, namely the work of Lee et al 9 with aluminum powder tracer, or from particle paths studies. 13 CFD simulations of the advection of a tracer in RIM 16 clearly show the presence of Lagrangian chaos for this flow regime, although the proof of Eulerian chaos existence is not yet published.…”

Section: Introductionmentioning

confidence: 94%

“…In industrial RIM processes, one stream is a polyol and the other an isocyanate, and the occurrence of complex interfacial phenomena 25 may also have some effect on mixing. 26 Nevertheless, this works fills a gap in literature regarding the characterization of the flow-field in the RIM machine mixing chamber, aiming the validation of CFD simulations results 16 and the identification of the mixing mechanisms in the RIM process.…”

Section: Introductionmentioning

confidence: 98%

“…22,23 Wong et al 22 showed that the vortices in T-jets micro mixers have the rotation axis parallel to the main flow direction, while in RIM the vortices rotation axis is perpendicular. 16 In the precipitators the mixer dimensions are at least tenfold than in RIM, and so the vortices scales are not geometrically constrained by the chamber. In RIM the vortices are formed in pairs of counter rotating vortices each occupying half the chamber diameter whereas in a T-jets precipitator 18 this fixed scale it is not observable.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics of the mixing chamber in RIM: PIV flow‐field characterization

Santos¹,

Erkoç²,

Dias³

et al. 2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).The flow-field in a Reaction Injection Moulding, RIM, machine mixing chamber was characterized using the Particle Image Velocimetry (PIV) technique. This study covered the industrial range of Reynolds numbers, Re, for the RIM process, from 100 to 500, setting the overall trends of the flow-field in that range, with particular focus on the flow regime transition range of 100 Re 150. The instantaneous 2D velocity vector maps were obtained with PIV in a plane containing the chamber and injectors axis. From instantaneous velocity data, the following quantities were computed: the probability density functions, the average velocity, and turbulence intensity. The present study sheds additional light into the transition of flow-field regime that marks the onset of mixing on RIM, and also into the mixing mechanisms and respective underlying flowfield features.

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Section: Overall Effect Of the Reynolds Numbersupporting

confidence: 88%

Section: Flow-field Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hydrodynamics of the mixing chamber in RIM: PIV flow‐field characterization

Santos¹,

Erkoç²,

Dias³

et al. 2008

AIChE Journal

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Dynamic behavior of the flow field in a RIM machine mixing chamber

et al. 2009

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Dynamic behavior of the flow field in a Reaction Injection Molding, RIM, machine mixing chamber, having dimensions typically used in industrial machines, is studied from dynamic velocity data of Laser Doppler Anemometry, LDA, measurements and Computational Fluid Dynamics, CFD, simulations with a 2D model. This study is based on the spectral analysis of the dynamic flow field data. The typical frequencies, in the reactor flow field, are identified and its values are related to the identified flow structures. The differences between the typical frequencies from experiments and simulations are observed and justified on the basis of the 2D representation of a 3D cylindrical geometry. © 2009 American Institute of Chemical Engineers AIChE J, 2009

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Experimental study of flow regimes in three‐dimensional confined impinging jets reactor

et al. 2014

AIChE Journal

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Dynamic behaviors in a three‐dimensional confined impinging jets reactor (CIJR) were experimentally studied by a flow visualization technique at 100 ≤ Re ≤ 2000 and 2 ≤ D/d ≤ 12 (where D is the reactor diameter and d is the nozzle diameter). The effects of inlet Reynolds numbers (Re) and geometry configurations of the CIJR on the flow regimes have been investigated by a particle image velocimetry and a high‐speed camera. Results show that with the increasing Re, a segregated flow regime, a radial deflective oscillation, an axial oscillation and a vortex shedding regime emerge in turns in CIJR. A map of parameter space formed by the inlet Reynolds number (Re) and the normalized reactor diameter (D/d) has been presented. The effects of jet instability and confined boundary of the chamber on the flow regimes and their transition are also investigated and discussed. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3033–3045, 2014

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Study of mixing and chemical reaction in RIM

Cited by 54 publications

References 39 publications

Hydrodynamics of the mixing chamber in RIM: PIV flow‐field characterization

Hydrodynamics of the mixing chamber in RIM: PIV flow‐field characterization

Dynamic behavior of the flow field in a RIM machine mixing chamber

Experimental study of flow regimes in three‐dimensional confined impinging jets reactor

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