Monitoring liquid displacement of model and industrial fluids in pipes by in-line ultrasonic rheometry

Wiklund, Johan; Stading, Mats; Trägårdh, Christian

doi:10.1016/j.jfoodeng.2010.03.011

Cited by 41 publications

(18 citation statements)

References 28 publications

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“…UIV and its derivatives have proved successful not only for blood flow measurements [28,29] but also for applications to hydrodynamics [30], to rheology [13,31] or to industrial situations involving optically opaque suspensions [32,33]. These velocimetry techniques rely upon the measurement of local displacements through cross-correlation of successive speckle signals received after successive pulses are sent through the scattering material.…”

Section: Acoustic Imaging In Suspensions Of Non-brownian Particlementioning

confidence: 99%

Simultaneous Concentration and Velocity Maps in Particle Suspensions under Shear from Rheo-Ultrasonic Imaging

et al. 2017

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We extend a previously developed ultrafast ultrasonic technique [Gallot et al., Rev. Sci. Instrum. 84, 045107 (2013)] to concentration field measurements in non-Brownian particle suspensions under shear. The technique provides access to time-resolved concentration maps within the gap of a Taylor-Couette cell simultaneously to local velocity measurements and standard rheological characterization. Benchmark experiments in homogeneous particle suspensions are used to calibrate the system. We then image heterogeneous concentration fields that result from centrifugation effects, from the classical Taylor-Couette instability and from sedimentation or shear-induced resuspension.

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Section: Acoustic Imaging In Suspensions Of Non-brownian Particlementioning

confidence: 99%

Simultaneous Concentration and Velocity Maps in Particle Suspensions under Shear from Rheo-Ultrasonic Imaging

et al. 2017

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“…The delay line is a material optimised for beam forming that contains the near-field distance. This delay line is fixed ahead of the transducer and is flush with the pipe wall, thus making it possible to have the focal point (position where sound energy is highest) of the ultrasonic beam at the wall interface (see Wiklund et al, 2010;Kotzé and Haldenwang, 2011;Kotzé et al, 2012Kotzé et al, , 2013. Standard transducers with a central basic frequency of 2 and 4 MHz were chosen in order to obtain a good compromise between spatial resolution, which is due to their short wavelength, and penetration depth (less attenuation).…”

Section: Uvp+pd Experimental Setup and Methodologymentioning

confidence: 99%

“…It is based on the traditional tube viscometry concept where the shear rate is obtained from the measurements of the volumetric flow rate and the shear stress at the wall is obtained from simultaneous measurement of the pressure difference over a fixed distance. The UVP+PD method and similar methods for determining the rheological parameters of a suspension or emulsion are already known and are described in several publications (Wunderlich and Brunn 1999;Dogan et al, 2005;Pfund et al, 2006;Wiklund et al, 2007;Birkhofer et al, 2008;Wiklund and Stading, 2008;Fock et al, 2009;Wassell et al, 2010;Wiklund et al, 2010;Kotze et al, 2008Kotze et al, , 2012. The UVP+PD methodology allows measurements not possible with commercial off-line rheometers such as radial velocity profiles and yield stress directly in-line and under dynamic process conditions.…”

mentioning

confidence: 99%

A feasibility study of in-line rheological characterisation of a wastewater sludge using ultrasound technology

Kotze¹,

Haldenwang²,

Fester³

et al. 2014

WSA

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The rheological characteristics of sludge affect transportation, treatment and the disposal processes involved in sludge system design and management operations such as dewatering, including flocculation and filtration. The concentration of solid matter in the sludge has an effect on rheological parameters such as yield stress and viscosity. These rheological properties of sludge are almost exclusively obtained today using commercially available instruments, such as conventional rotational rheometers or tube (capillary) viscometers. Since these methods are time-consuming and unsuitable for realtime process monitoring, the ultrasonic velocity profiling coupled with pressure drop (UVP+PD) methodology becomes very attractive for in-line flow behaviour monitoring for quality control and process optimisation. The main objective of this research work was to evaluate the UVP+PD technique in a concentrated sludge as found in a wastewater treatment plant. A portable pump test rig with tube viscometer fitted with a UVP+PD system was used to determine the rheological parameters. Conventional UVP installation techniques were tested as well as a new delay line UVP transducer. The results obtained from different installation techniques and transducers are compared. Finally, rheological parameters obtained using UVP+PD compared within 15% of that obtained using the tube viscometer. The results showed that UVP+PD is a feasible and promising technique for in-line real time flow visualisation and rheological characterisation for treated wastewater sludge which, when used as in-line process control, could lead to significant savings in chemicals and will optimise processes producing drier sludges and filter cakes.

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“…Examples include e.g. studies of paper pulp up to a volume fraction of 7.7% (Wiklund et al 2006), industrial suspensions and foods (Wiklund and Stading 2008;Wiklund et al 2010). These types of flow are echogenic by nature, i.e.…”

Section: Miscellaneous Applicationsmentioning

confidence: 99%

Ultrasound Imaging Velocimetry: a review

Poelma

2016

Exp Fluids

112

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Monitoring liquid displacement of model and industrial fluids in pipes by in-line ultrasonic rheometry

Cited by 41 publications

References 28 publications

Simultaneous Concentration and Velocity Maps in Particle Suspensions under Shear from Rheo-Ultrasonic Imaging

Simultaneous Concentration and Velocity Maps in Particle Suspensions under Shear from Rheo-Ultrasonic Imaging

A feasibility study of in-line rheological characterisation of a wastewater sludge using ultrasound technology

Ultrasound Imaging Velocimetry: a review

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