Liquid injection molding I. An investigation of impingement mixing

Malguarnera, S. C.; Suh, Nam P.

doi:10.1002/pen.760170209

Cited by 59 publications

(52 citation statements)

References 1 publication

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“…These dramatic changes in the flow-field are clear from the observation of Figure 6 and thus this study will set the critical Reynolds number at Re 5 120, close to values previously reported. 9,10,13,15,27,35 For higher Reynolds numbers, from Re 5 120 up to Re 5 150 where the flow presents a strong dynamics, the flow-field features identifiable from the instantaneous velocity vector maps do not present any observable evolution with the Reynolds number.…”

Section: Critical Reynolds Number Characterizationmentioning

confidence: 90%

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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: Critical Reynolds Number Characterizationmentioning

confidence: 90%

“…The viscosity and density curves as functions of temperature were used to calculate the Reynolds number, Re, originally defined for RIM machine mixing chamber at the injector as, 27 Re…”

Section: Fluidsmentioning

confidence: 99%

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

Santos¹,

Erkoç²,

Dias³

et al. 2008

AIChE Journal

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“…Malguarnera and Suh [21] investigated several dimensionless numbers related to the flow in the RIM mixing chamber. From this study, two main parameters were singled out, i.e., the Renumber and the momentum ratio between the opposed jets.…”

Section: Flow Regime In Cijmentioning

confidence: 99%

State of the Art of Mini/Micro Jet Reactors

Santos

Sultan

2013

Chem Eng & Technol

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For over three decades, opposed-jets reactors have been applied particularly for fast complex chemical reactions where mixing affects the final product distribution. The first opposed-jets reactors, i.e., confined impinging jets (CIJ), had cylindrical geometries. With the advent of microreactors, a new type of prismatic opposed-jets reactors has been introduced, the so-called T-jets reactors. The state of the art of the know-how on mixing in CIJ reactors as well as the current state of the art of T-jets reactors is described. T-jets and CIJ are generally small-scale devices, ensuring that these units can mix fluids within very short mixing times on the order of milliseconds. The small scale has the disadvantage of compromising the reactors' throughput. This fact can prevent the dissemination of this type of mixers to applications where conventional reactors, such as stirred tanks, are used. Attention is paid to the issue on how to scale up opposed-jets reactors without compromising mixing times. A short analysis of the main research questions to be answered in this field is made.

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“…Other indirect measures of mix in continuous processors include exotherm of reaction (Lee, Ottino, Ranz, and Macosko, 1979), titration of small extrudate samples (Malguarnera and Suh, 1976), or some other gross property of the mixture. While many of these indirect measures have direct technological application, they offer little insight into the mechanisms of mixing.…”

Section: External Mixing Analysis: Extrudate Scanningmentioning

confidence: 99%