Dynamics analysis of cavitation disintegration of microparticles during nanopowder preparation in a new Water Jet Mill (WJM) device

Dvorský, Richard; Luňáček, Jiří; Slíva, Aleš

doi:10.1016/j.apt.2010.09.008

Cited by 11 publications

(7 citation statements)

References 7 publications

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“…Coal particles could be accelerated during mixing process to achieve a high speed and impacted on rigid target to realize pulverization, with a PSD of 90-450 μm [35]. In addition, Richard Dvorsky applied the cavitation of high pressure water jet (HPWJ) to enforce disintegration of silica particles to obtain nanopowder preparation [36]. These tries had shown a great potential of milling ELTs for ultrafine CR particles with UHPWJ.…”

Section: Introductionmentioning

confidence: 99%

Pulverization of end-of-life tires by ultra-high pressure water jet process

Wang

Kang

Zhao

2016

Journal of Polymer Engineering

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Abstract Crumb rubber (CR), as a final product from end-of-life tires through size reduction process, has proved an appropriate end product for accumulated discard waste tires all around the world. Unlike pre-existing pulverization methods, such as ambient or cryogenic grinding and solid-state shear extrusion, an entire cool pulverization process utilizing ultra-high pressure water jet (UHPWJ) was proposed in this paper. Pulverization experiments under various processing parameters were designed and conducted. The particle size distributions of produced CR were obtained using laser particle analyzer. Microscopic morphologies of CR and rubber fracture surface were observed under scanning electron microscopy. The crosslink density and gel fraction of produced CR were experimentally determined. Influence of four main processing parameters as pump pressure, transverse velocity, standoff distance and impacting angle was discussed in detail, and the most suitable processing parameters were recommended. The results show that the particle size distribution of produced CR with UHPWJ is between 45 μm and 200 μm, and the surface of CR is coarse and porous. High compressive shear effect and erosion are the main mechanisms in UHPWJ pulverization. Besides, the produced CR has already been partly devulcanized after UHPWJ pulverization, and polymer degradation occurred in the meanwhile.

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Section: Introductionmentioning

confidence: 99%

Pulverization of end-of-life tires by ultra-high pressure water jet process

Wang

Kang

Zhao

2016

Journal of Polymer Engineering

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“…There is an increasingly popular application of HC in particle dissolution and disintegration, ,, as well as physical and chemical processing. , For example, a study by Faraloni et al demonstrated the exceptional efficiency of hydrodynamic cavitation (HC) in food processing and material dissociation. The study showed that HC can produce high extraction yields and nutritional profiles comparable to those of a high-end commercial product.…”

Section: Introductionmentioning

confidence: 99%

“…HC is of great interest in many applications including energy harvesting, 17 wastewater treatment, 18 biomedical engineering, 19 and wet appliances. 3 There is an increasingly popular application of HC in particle dissolution and disintegration, 5,20,21 as well as physical and chemical processing. 22,23 For example, a study by Faraloni et al 24 demonstrated the exceptional efficiency of hydrodynamic cavitation (HC) in food processing and material dissociation.…”

Section: Introductionmentioning

confidence: 99%

Detergent Dissolution Intensification via Energy-Efficient Hydrodynamic Cavitation Reactors

et al. 2023

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In this study, we explored the potential of hydrodynamic cavitation (HC) for use in dissolution of liquid and powder detergents. For this, microfluidic and polyether ether ketone (PEEK) tube HC reactors with different configurations were employed, and the results from the reactors were compared with a magnetic stirrer, as well as a tergotometer. According to our results PEEK tube HC reactors present the best performance for dissolution of liquid and powder detergents. In the case of liquid detergent, for the same level of initial concentration and comparable final dissolution, the PEEK tube consumed 16.7 and 70% of the energy and time of a tergotometer and 16.7 and 14.8% of that of a magnetic stirrer, respectively. In the case of powder detergent, the PEEK tube used 12% less power than a tergotometer and 81.2% less power than a magnetic stirrer. Additionally, the time required to dissolve the detergent was reduced significantly from 1200 s in the tergotometer and 1800 s in the magnetic stirrer to just 50 s in the PEEK tube. These results suggest that HC could significantly improve the dissolution rate of liquid and powder detergents and energy consumption in washing machines.

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“…Another promising disintegration method is using the effect of cavitation implosions on particles dispersed in water. Cavitation implosion powered by acoustic pressure from ultrasonic generators can produce particles from microscale to nanoscale [8] and by using intense cavitation generated by high energy water beam in Water Jet Mill disintegrator, the particles size can be lower than 100 nm [9]. The other approach to nanostructured materials is called bottom-up method.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnS nanoparticles of required size by precipitation in aerosol microdroplets

Bednář

Svoboda

Mančík

et al. 2019

Materials Science and Technology

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Zinc sulphide (ZnS) nanoparticles were prepared by an aerosol method from zinc acetate and sodium sulphide (Na2S) aqueous solutions. Aqueous solution of zinc acetate was dispersed into the form of microdroplets, which were introduced by airflow to vigorously stirred aqueous solution of Na2S, which was in excess. Microdroplets served as microreactors, so the reaction took place only in limited volume. Particle size distribution was studied by transmission electron microscopy and by dynamic light scattering measurements. In this work, the equation that allows us to predict the final size distribution of ZnS nanoparticles using exact concentration of zinc acetate was derived and ZnS nanoparticles with predicted mean particle diameter around 50 and 70 nm were successfully synthetised. GRAPHICAL ABSTRACT

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Dynamics analysis of cavitation disintegration of microparticles during nanopowder preparation in a new Water Jet Mill (WJM) device

Cited by 11 publications

References 7 publications

Pulverization of end-of-life tires by ultra-high pressure water jet process

Pulverization of end-of-life tires by ultra-high pressure water jet process

Detergent Dissolution Intensification via Energy-Efficient Hydrodynamic Cavitation Reactors

Synthesis of ZnS nanoparticles of required size by precipitation in aerosol microdroplets

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