Laminar mixing in a SMX static mixer evaluated by positron emission particle tracking (PEPT) and magnetic resonance imaging (MRI)

Mihailova, Olga; Lim, Victor; McCarthy, Michael J.; McCarthy, Kathryn; Bakalis, Serafim

doi:10.1016/j.ces.2015.07.015

Cited by 41 publications

(25 citation statements)

References 26 publications

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“…This behaviour is in contrast to that of the glycerol solution, and is ascribed to both the significantly (P < 0.05) lower viscosity of the CMC solution in comparison to the glycerol solution. The shear-thinning behaviour of the CMC solution promotes greater penetration of the acoustic-beam and enhanced recirculation, as when the ultrasonic amplitude increased, there were increased levels of energy, increasing the shear rate within the system, reducing the bulk viscosity, which is in agreement with the literature for fluid flow within pipes and static mixer systems [42]. Furthermore, the formation of vortices for the CMC solution at an ultrasonic amplitude of 80% ( Fig.…”

Section: Effect Of Ultrasonic Amplitude and Fluid Type On Fluid Flow supporting

confidence: 88%

Characterisation of flow behaviour and velocity induced by ultrasound using particle image velocimetry (PIV): Effect of fluid rheology, acoustic intensity and transducer tip size

O’Sullivan

Espinoza

Mihailova

et al. 2018

Ultrasonics Sonochemistry

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Acoustic streaming phenomena of ultrasound propagation through liquid media was investigated experimentally employing particle image velocimetry (PIV). Parameters associated with the ultrasonic processor of ultrasonic amplitude (i.e., acoustic power) and transducer tip diameter (i.e., surface area), as well as, fluid rheology (i.e., water, glycerol solution and CMC solution), were studied for their effects on overall flow behaviour and fluid velocity. PIV yielded velocity gradient maps, demonstrating the acoustic streaming phenomena of ultrasound and its associated flow behaviour as a function of ultrasonic amplitude and fluid rheology, whereby increasing amplitude allowed for greater penetration of the acoustic-beam through the bulk of the fluid, and increasing fluid rheology yielded the converse effect. Moreover, upon impingement of the acoustic-beam with the base of vessel, vortex formation occurred, yielding a recirculation pattern. The maximum observed fluid velocities for water, glycerol solution and CMC solution were 0.329 m s, 0.423 m s, and 0.304 m s, respectively (large diameter sonotrode tip for an ultrasonic amplitude of 80%). Furthermore, shear rates were attained (maximum values of 24.25 s), and Reynolds numbers were determined in order to assess the degree of turbulence as a function of investigated parameters.

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Section: Effect Of Ultrasonic Amplitude and Fluid Type On Fluid Flow supporting

confidence: 88%

Characterisation of flow behaviour and velocity induced by ultrasound using particle image velocimetry (PIV): Effect of fluid rheology, acoustic intensity and transducer tip size

O’Sullivan

Espinoza

Mihailova

et al. 2018

Ultrasonics Sonochemistry

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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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“…Darüber hinaus finden sie Anwendung für die Analyse von Transport‐, Misch‐ und Trennphänomenen in der chemischen Verfahrenstechnik und Prozesskontrolle . Durch Modulation der Phase des gemessenen NMR‐Signals mit den Komponenten des Geschwindigkeitsvektors kann der Geschwindigkeitsvektor von Flüssigkeiten in Mischern, Reaktoren und anderen Komponenten abgebildet werden . Beispielsweise zeigen die Stromlinien von Wasser in einem Aneurysmenmodell, dass sich ein Wirbel im Aneurysmensack bildet (Abbildung a) .…”

Section: Fourier‐nmrunclassified

NMR mit Tischgeräten und deren Anwendungen von der Materialwissenschaft bis zur organischen Chemie

Blümich

Singh

2017

Angewandte Chemie

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Die NMR‐Spektroskopie ist eine unverzichtbare Analysemethode. Bis vor kurzem erforderten die Geräte viel Platz, waren teuer und schwer zu bedienen. Dies hat sich mit der Einführung kompakter NMR‐Spektrometer geändert, die sich für die Analyse kleiner Moleküle auf der Laborbank eignen. Solche Spektrometer sind mit Permanentmagneten für 1H‐NMR‐Frequenzen zwischen 40 und 80 MHz ausgestattet. Erst seit wenigen Jahren gibt es kleine Permanentmagnete mit homogenen Magnetfeldern für hochaufgelöste Spektroskopie. Tischgeräte mit inhomogenen Feldern werden schon seit 40 Jahren zur Charakterisierung von Lebensmitteln und Materialien über Relaxations‐ und Diffusionsmessungen genutzt. Ähnliche NMR‐Geräte messen diese Parameter im Streufeld außerhalb des Magneten. Sie werden zur Untersuchung von Bohrlochwänden in Ölquellen sowie für zerstörungsfreie Analysenverwendet. Der gegenwärtige Stand von NMR‐Spektroskopie, ‐Bildgebung und ‐Relaxometrie wird hier anhand repräsentativer Beispiele beschrieben.

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Laminar mixing in a SMX static mixer evaluated by positron emission particle tracking (PEPT) and magnetic resonance imaging (MRI)

Cited by 41 publications

References 26 publications

Characterisation of flow behaviour and velocity induced by ultrasound using particle image velocimetry (PIV): Effect of fluid rheology, acoustic intensity and transducer tip size

Characterisation of flow behaviour and velocity induced by ultrasound using particle image velocimetry (PIV): Effect of fluid rheology, acoustic intensity and transducer tip size

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

NMR mit Tischgeräten und deren Anwendungen von der Materialwissenschaft bis zur organischen Chemie

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