Single‐Phase Flow Residence‐Time Distributions in a Rotor‐Stator Spinning Disc Reactor

Haseidl, Franz; König, Pascal D.; Hinrichsen, Olaf

doi:10.1002/ceat.201600247

Cited by 18 publications

(8 citation statements)

References 41 publications

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“…If Cin[m] is m points sequence and E[n] is an n points sequence then Cout[o] will be (m+n-1) points sequence. Deconvolution operation is performed by the reversed operation of the convolution (25). It is used to separate the mixed signals.…”

Section: Convolution and Deconvolutionmentioning

confidence: 99%

RTD Modeling of a Non-Ideal Coiled-Tube Reactor Through Experimental Investigation for Pulse Input Using Methylene Blue Dye

2020

J. Environ. Treat. Tech.

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This paper focuses on the grasp of a deep understanding of flow behavior in a coiled tube reactor through Residence Time Distribution (RTD) studies. The reactors, in general, are classified ideally: mixed and plug-flow patterns. Unfortunately, in the real world, it has been observed that they show very different behavior from that expected. Thus, the characterization of the nonideal coiled tube reactor is needed to carry out. The calculations were carried out in the Matlab for distribution of residence time of the coiled tube reactor that is used in the Chemical Reaction Engineering Laboratory at MIET College. Pulse input tests were used significantly to analyzed the flow behavior using methylene blue (MB) tracer. A significant disparity in RTD curves in the presence of the secondary flow was examined and data were recorded. Finally, a suitable mathematical model was selected from the Tank in Series (TIS) and Axial Dispersion Models (ADMs) based on residual error and was used to validate these outcomes. The deconvoluted of the signal was used to get Cin for the verification of the pulse input behavior. The results were compared with the experimental data that concluded the modeling of the reactor is in good agreement.

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Section: Convolution and Deconvolutionmentioning

confidence: 99%

RTD Modeling of a Non-Ideal Coiled-Tube Reactor Through Experimental Investigation for Pulse Input Using Methylene Blue Dye

2020

J. Environ. Treat. Tech.

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“…The TiS model was chosen over the axial dispersion model as it has been used extensively in previous studies to characterize the mixing efficiency in OBRs, ,,− its simplicity and robustness, and independence from adding or removing different sections within a reactor, making the addition of columns possible without impacting the model, as well as the independence to reactor length and flow rate . The TiS model with back-mixing was not used, as the oscillatory parameters did not exceed 16 mm (0.23 times the baffle length) or f > 20 Hz as stated by Avila et al Application of a deconvolution through the time domain using fast-Fourier transformation (FFT) was evaluated to find the true RTD profiles. − An OBR system of 7 L with a tube diameter of 40 mm was used for this study. A total of five baffled columns were used to evaluate the RTD along the reactor length, noting both the effect of connecting U-bends and reactor length.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the Effect of U-Bends, Flow Parameters, and Feasibility for Scale-Up on Residence Time Distribution Curves for a Continuous Bioprocessing Oscillatory Baffled Flow Reactor

Cox

Salonitis

Rebrov

et al. 2022

Ind. Eng. Chem. Res.

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An oscillatory baffled flow reactor (OBR) has been designed with 60 interbaffled cells. The baffled columns of 40 mm internal diameter together result in a reactor length of 5740 mm. The oscillatory amplitude and frequency were in the range of 2−12 mm and 0.3−2 Hz, respectively. The report investigates the impact of Ubends and the number of reactor sections on axial dispersion for scaleup feasibility. A prediction model using operating parameters has been developed to maximize plug flow conditions using the tanks-in-series (TiS) model. The maximum TiS value was 13.38 in a single column compared to 43.68 in the full reactor at a velocity ratio of 2.27 using oscillatory parameters 8 mm and 0.3 Hz. The mixing efficiency along the reactor was found to decrease after each column at amplitudes <6 mm compared to amplitudes up to 12 mm, where a negligible impact was observed. U-bend geometry had a significant role in the decrease of TiS values.

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“…In contrast to other types of spinning disk reactors, − which have also proven potential for process intensification, − the rs-SDR consists of a rotating disk (rotor) enclosed by a cylindrical housing (stator) separated by only a few millimeters. Such configuration provides one extra degree of freedom in comparison to other spinning disk reactors, which is control over the residence time of the throughflow. − …”

Section: Introductionmentioning

confidence: 99%

Micromixing Efficiency in the Presence of an Inert Gas in a Rotor–Stator Spinning Disk Reactor

Martinez

Chaudhuri

Besten

et al. 2021

Ind. Eng. Chem. Res.

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The effects on micromixing of co-feeding an inert gas with the bulk liquid are studied for a rotor–stator spinning disk reactor by means of the Villermaux–Dushman test reaction. The results of varying rotational speeds and gas–liquid ratios are reported for three configurations: injecting the acid into the dispersed region, into the bottom thin-film region, and into the upper thin-film region. The results show that injecting in the dispersed region is the optimal configuration, as the liquid experiences the shear stress between the rotor and the stator, and with increasing rotational speed, micromixing efficiency subsequently increases. Injecting in the thin-film regions leads to poor micromixing efficiency, since the gas layer reduces the turbulence levels experienced by the liquid. For the bottom thin film, increasing rotational speed improves micromixing efficiency due to inertial rotation of the liquid film. However, in the upper thin film, micromixing is significantly worse, being affected by the dripping of liquid on the stator at the injection point. Gas holdup measurements are compared to previous studies, showing that most of the gas volume is present in the thin-film regions. These results are relevant for the design of modular chemical processes using the spinning disk technology, when fast competitive chemical reactions occur in the presence of gas and liquid.

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Single‐Phase Flow Residence‐Time Distributions in a Rotor‐Stator Spinning Disc Reactor

Cited by 18 publications

References 41 publications

RTD Modeling of a Non-Ideal Coiled-Tube Reactor Through Experimental Investigation for Pulse Input Using Methylene Blue Dye

RTD Modeling of a Non-Ideal Coiled-Tube Reactor Through Experimental Investigation for Pulse Input Using Methylene Blue Dye

Revisiting the Effect of U-Bends, Flow Parameters, and Feasibility for Scale-Up on Residence Time Distribution Curves for a Continuous Bioprocessing Oscillatory Baffled Flow Reactor

Micromixing Efficiency in the Presence of an Inert Gas in a Rotor–Stator Spinning Disk Reactor

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