Simulation of gas–liquid flow in a helical static mixer

Zidouni, Faiza; Krepper, Eckhard; Rzehak, Roland; Rabha, Swapna; Schubert, Markus; Hampel, Uwe

doi:10.1016/j.ces.2015.06.052

Cited by 47 publications

(29 citation statements)

References 42 publications

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“…Yin et al demonstrated that four different gas core structures may be formed upstream of the swirl element under the influence of the geometry and flow parameters [3,9]. However, despite the importance of understanding the influence of the geometric design, the knowledge obtained from both experimental and numerical studies is still limited [10]. Among those investigations, the experimental works done by Rabha et al [5] and Putra et al [11] provide valuable gas distribution profiles inside the helical static element and the blade element, respectively, which are useful for characterizing the multiphase flows inside the swirl generating devices.…”

Section: Introductionmentioning

confidence: 99%

“…High-resolution measuring techniques, such as ultrafast electron beam X-ray tomography (UFXCT) and high-resolution gamma-ray computed tomography (HireCT), were used to provide radial gas-phase distributions [5,11]. Based on the work of Rabha et al [5], Zidouni et al [10] performed Euler-Euler computational fluid dynamics (CFD) simulations on gas-liquid flows in a single helical static mixer using a mono-dispersed bubble-sized distribution approach. Here, the diameter (D) of the mixer was 80 mm, and it was installed in a vertical pipe.…”

Section: Introductionmentioning

confidence: 99%

“…Here, the diameter (D) of the mixer was 80 mm, and it was installed in a vertical pipe. They found that the inlet bubble size distributions, assumed in the simulation, did significantly affect the gas distribution profile inside the static mixer [10]. Putra et al [11] presented Euler-Euler simulations for a blade swirl element in a vertical pipe (D = 27 mm) using both mono-dispersed and bi-modal bubble size distribution approaches.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Gas–Liquid Flow Characteristics in Geometrically Different Swirl Generating Devices

et al. 2019

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The gas–liquid flow characteristics for blade, single, and the double-helical swirl elements were numerically investigated and compared in this work. The Euler–Euler model assuming bi-modal bubble size distributions was used. The experiment, conducted in a vertical pipe equipped with a static blade swirl element, was used as the basis for the computational fluid dynamics (CFD) simulations. In the experiment, high-resolution gamma-ray computed tomography (HireCT) was used to measure the gas volume fractions at several planes within the blade swirl element. The resulting calculated profiles of the pressure, liquid and gas velocities as well as the gas fraction showed a large influence of the swirl elements’ geometry. The evolution and characteristics of the calculated gas–liquid phase distributions in different measurement planes were found to be unique for each type of swirl element. A single gas core in the center of the pipe was observed from the simulation of the blade element, while multiple cores were observed from the simulations of the single and double helix elements. The cross-sectional gas distribution downstream of the single and double helical elements changed drastically within a relatively short distance downstream of the elements. In contrast, the single gas core downstream of the blade element was more stable.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of Gas–Liquid Flow Characteristics in Geometrically Different Swirl Generating Devices

et al. 2019

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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: 54%

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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“…Single-/two-phase systems Ujhidy et al 23 Schönfeld et al 14 Al-Atabi et al 24 Laser-induced fluorescence (LIF) Two-phase systems Peerhossaini and Wesfreid 25 Wadley and Dawson 26 Hirata and Ohkawa 19 Planar LIF Two-phase systems Lehwald et al 27 Ramsay et al 28 Alberini et al 29 Arratia and Muzzio 30 Positron emission particle tracking Two-phase systems Rafiee et al 31 Mihailova et al 32,33 Ultrafast electron beam X-ray tomography Two-phase systems Rabha et al 34 Zidouni et al 35…”

Section: Colored Dyementioning

confidence: 99%

Design and characterization of a Low‐pressure‐drop static mixer

2019

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in Wiley Online Library (wileyonlinelibrary.com)Four-blade static mixer was designed for inline mixing of Newtonian fluids at Reynolds numbers from 700 to 6800. The mixer consists of four equally spaced blades mounted on cylindrical housing with 45 rotation relative to the circumference. It was tested in three different compartments of 6, 8, and 10 mixing elements; each element rotated 45 relative to the adjacent one. Multipoint sampling was used to measure concentration downstream the mixer. The mixing quality was measured by the coefficient of variance (CoV). The CoV decreases as the energy input per unit mass increases. This effect is more pronounced when the number of mixing elements increases. For the case of 10 mixing elements, a good mixing performance (typically more than 95% mixedness or CoV < 0.05) achieved, although a marginally good mixing performance could also be achieved by eight mixing elements. The friction factors were correlated as f = C 1 /Re + C 2 /Re n with an average deviation of AE10% from experimental data. Furthermore, experimental friction factors were compared with existing models. For a wide range of Reynolds numbers, the friction factors are apparently smaller than those from SMV, KMX, and baffle-type static mixers. Figure 11. Comparison of friction factor data with other models.

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Simulation of gas–liquid flow in a helical static mixer

Cited by 47 publications

References 42 publications

Comparison of Gas–Liquid Flow Characteristics in Geometrically Different Swirl Generating Devices

Comparison of Gas–Liquid Flow Characteristics in Geometrically Different Swirl Generating Devices

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

Design and characterization of a Low‐pressure‐drop static mixer

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