Ultrasonic technique to determine particle size and concentration in slurry systems

Shukla, Amit; Prakash, Anand

doi:10.1016/j.ces.2005.11.027

Cited by 17 publications

(4 citation statements)

References 16 publications

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“…With ultrasound offering non-invasive, fast and potentially no sample dilution required attractions, such a technique based particle sizing is receiving great attentions from the industry world and the academic community Goetz, 1996, 2002;Povey, 1997Povey, , 2000Babick et al, 1998;Challis et al, 2005;Shukla and Prakash, 2006). The principle of ultrasound particle sizing technique is to measure the attenuation of ultrasound in terms of frequency as acoustic waves propagate through the particle suspensions and then invert the attenuation into particle size distribution.…”

Section: Introductionmentioning

confidence: 98%

Application of ultrasound spectroscopy for nanoparticle sizing in high concentration suspensions: A factor analysis on the effects of concentration and frequency

Liu

2009

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 98%

Application of ultrasound spectroscopy for nanoparticle sizing in high concentration suspensions: A factor analysis on the effects of concentration and frequency

Liu

2009

Chemical Engineering Science

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“…In this work, we report for the first time, an ultrasound-based technique to determine mixing time in an unbaffled vortex mixer incorporating a magnetic needle coupled to an external magnetic drive. Ultrasound technique (UT) has been widely used in process applications spanning a wide range of applications like determination of bubble size and density in bubble columns, , liquid hold up in solvent extraction contactors, , estimation of solid concentration in stirred tanks, estimation of liquid levels in a multiphase system, − estimation of solution concentrations, and determination of physical properties of fluids , to name a few. In a few manifestations, UT has been used to determine residence time distribution in the flow of polymer melt through an extruder. , However, to the best of our knowledge, there has been no report on application of UT in determining mixing time in vortex reactors.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound Based Noninvasive Estimation of Mixing Time in a Vortex Reactor

Sen

Mukherjee

Singh

et al. 2022

Ind. Eng. Chem. Res.

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A vortex reactor represents an important class of equipment in chemical processing industries pertaining to crystallization and precipitation. They are characterized by the presence of a vortex generated due to rotation of a centrally placed impeller/magnetic needle at its center. The addition of reactants into the vortex leads to their mixing under forced vortex conditions. Estimation of mixing time in such reactors is essential for the proper design of reactors. In this work, we propose a novel technique to estimate the mixing time in a vortex reactor using an ultrasonic technique. As tracer is injected into the bulk liquid being stirred, there is a change in the speed of sound of the liquid in the vessel. This dynamic variation of sound velocity is acquired and analyzed to determine mixing time as well as the dynamics of mixing process of the tracer. A frequency of 40 Hz is achieved which leads to estimation of mixing dynamics with high time resolution. Validity of the proposed technique is ensured by comparing mixing time against that determined using a conventional dye based photographic technique. The proposed technique is thereafter used to determine mixing time and mixing dynamics under different operating (needle rotational speed and liquid head) and geometrical (needle and vessel diameter) conditions.

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“…Ultrasound technique has been widely used in process applications encompassing a wide range of applications. For example, ultrasonic technology (UT) has been used to determine bubble size and density in bubble columns, 19,20 liquid hold up in solvent extraction contactors, 21,22 to determine solid concentration in stirred tanks, 23 to determine liquid levels in multiphase system, [24][25][26] to determine physical properties of fluids 27,28 to name a few. In a few manifestations, UT has been used to determine residence time distribution in flow of polymer melt through an extruder.…”

Section: Introductionmentioning

confidence: 99%

Non‐invasive mixing time estimation in unbaffled stirred tank: An ultrasonic approach

et al. 2022

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Estimation of mixing time is an essential aspect in characterization of stirred tanks. In this work, we report a novel, non‐invasive technique to estimate mixing time in an unbaffled stirred tank using a contact type ultrasonic sensor. Variation in speed of sound in stirred tank is measured by ultrasound and is used to determine the mixing time of solutions. A sensing time of 16.6 ms (~60 Hz) is achieved which leads to an estimation of the mixing process dynamics under forced vortex conditions. The method is validated against colorimetric technique using a dye. The technique is thereafter used to determine mixing time under different operating (impeller speed) and geometrical (impeller design, vessel diameter, and off‐bottom clearance) conditions. Though the results presented are specific to unbaffled stirred tank, the method reported is general and can be used in any kind of stirred tank.

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Ultrasonic technique to determine particle size and concentration in slurry systems

Cited by 17 publications

References 16 publications

Application of ultrasound spectroscopy for nanoparticle sizing in high concentration suspensions: A factor analysis on the effects of concentration and frequency

Application of ultrasound spectroscopy for nanoparticle sizing in high concentration suspensions: A factor analysis on the effects of concentration and frequency

Ultrasound Based Noninvasive Estimation of Mixing Time in a Vortex Reactor

Non‐invasive mixing time estimation in unbaffled stirred tank: An ultrasonic approach

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