Visualization and quantitative analysis of dispersive mixing by a helical static mixer in upward co-current gas–liquid flow

Rabha, Swapna; Schubert, Markus; Grugel, Fanny; Banowski, Manuel; Hampel, Uwe

doi:10.1016/j.cej.2014.09.019

Cited by 57 publications

(64 citation statements)

References 26 publications

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“…1 together with axial positions of the measurement planes. Further details of the experimental setup are summarized by Rabha et al (2015).…”

Section: Summary Of Experimental Datamentioning

confidence: 99%

“…Experiments (Rabha et al 2015) have been performed on a pipe with inner diameter D ¼80 mm of which up to three segments could be replaced by units each containing three helical mixer elements. Each of the elements has a twist angle of 1801, an aspect ratio H/D¼ 1, and occupies 10% of the volume within the pipe section of length H. The mixer elements have alternating directions of twist and are mounted such that the leading edge of each element is offset by 901 relative to the trailing edge of the preceding one.…”

Section: Summary Of Experimental Datamentioning

confidence: 99%

“…Development of data processing algorithms needed to extract the desired observables from the raw data in complex geometries is still ongoing, but a first data set on a helical static mixer has become available recently (Rabha et al 2015).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of gas–liquid flow in a helical static mixer

Zidouni

Krepper

Rzehak

et al. 2015

Chemical Engineering Science

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“…1 together with axial positions of the measurement planes. Further details of the experimental setup are summarized by Rabha et al (2015).…”

Section: Summary Of Experimental Datamentioning

confidence: 99%

Section: Summary Of Experimental Datamentioning

confidence: 99%

See 1 more Smart Citation

Simulation of gas–liquid flow in a helical static mixer

Zidouni

Krepper

Rzehak

et al. 2015

Chemical Engineering Science

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“…This is confirmed in a recent static mixers review, in which this application is absent [11]. So, recent air-water and advanced studies in an upward co-current gas-liquid flow along a helical static mixer consider the visualization and quantitative of the dispersive mixing of air in a water flow, as well as its simulations in Computational Fluid Dynamic (CFD) software [12,13]. These studies give details of the physical processes involved in this mixing process and show the path to be followed by the processes carried out in ammonia-water absorption, where there is a chemical reaction.…”

Section: Introductionmentioning

confidence: 53%

A Theoretical-Experimental Comparison of an Improved Ammonia-Water Bubble Absorber by Means of a Helical Static Mixer

et al. 2017

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Abstract:The heat transfer in double pipe heat exchangers is very poor. This complicates its application in absorption cooling systems, however, the implementation of simple passive techniques should help to increase the heat and mass transfer mainly in the absorber. This paper carried out a simulation and its experimental comparison of a NH 3 -H 2 O bubble absorption process using a double tube heat exchanger with a helical screw static mixer in both central and annular sides. The experimental results showed that the absorption heat load per area is 31.61% higher with the helical screw mixer than the smooth tube. The theoretical and experimental comparison showed that the absorption heat load difference values were 28.0 and 21.9% for smooth tube and the helical mixer, respectively. These difference values were caused by the calculation of the log mean temperature difference in equilibrium conditions to avoid the overlap of solution temperatures. Therefore, the theoretical and experimental results should be improved when the absorption heat is included in the heat transfer equation or avoiding the operation condition when output is lower than input solution temperature.

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“…Also, static mixers are preferred for their good mixing quality at low shear rates, low equipment cost, small space requirement, sharp residence time distributions, self-cleaning capability and high interfacial area production (Thakur et al, 2003;Etchells and Meyer, 2004;Ghanem et al, 2014). Static mixers are also good alternatives for processing aggressive and corrosive media, and for high pressure operations, where shaft feed troughs are expensive (Rabha et al, 2015). Static mixers are also used to improve the mass transfer rates from gas to liquid (Goto and Gaspillo, 1992;Heyouni et al, 2002;Martin and Galey, 1994;Munter, 2010).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Performance of Kenics Static Mixers for the Agitation of Shear Thinning Fluids

Mahammedi

Ameur²,

Ariss

2017

JAFM

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The laminar flow of non-Newtonian fluids through a Kenics static mixer is investigated by using the CFD (Computational Fluid Dynamics) tool. The working fluids have a shear thinning behavior modeled by the Ostwald De Waele law. We focus on the effect of Reynolds number, fluid properties, twist angle and blade pitch on the flow characteristics and energy cost. The pressure drop information obtained from the simulations was compared to several experimental correlations and data available in the literature. The numerical results were found in good agreement with the experimental values. From the obtained results, the twist technique is confirmed to be very useful to enhance the mixing with less power consumption and at low Reynolds numbers. A faster axial mixing has been achieved with increased blade length and decreased twist angle. However, the good mixing near the tube walls was obtained with increased twist angle. The power consumption expressed in power drop was found to be increase with increased CMC concentrations, Reynolds number, twist angle and decreased blade length.

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Visualization and quantitative analysis of dispersive mixing by a helical static mixer in upward co-current gas–liquid flow

Cited by 57 publications

References 26 publications

Simulation of gas–liquid flow in a helical static mixer

Simulation of gas–liquid flow in a helical static mixer

A Theoretical-Experimental Comparison of an Improved Ammonia-Water Bubble Absorber by Means of a Helical Static Mixer

Numerical Investigation of the Performance of Kenics Static Mixers for the Agitation of Shear Thinning Fluids

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