Research de-vulcanization of tyres rubber in an ultrasonic field

2020 ◽

Vol 14 (3) ◽

pp. 7235-7243

Author(s):

N.M. Ali ◽

F. Dzaharudin ◽

E.A. Alias

Keyword(s):

Oscillation Amplitude ◽

Ultrasonic Field ◽

Dynamical Behaviour ◽

Ultrasound Contrast Agents ◽

Chaotic Behaviour ◽

Solid Boundary ◽

Driving Frequency ◽

Pressure Amplitude ◽

Radial Expansion ◽

Therapeutic Delivery

Microbubbles have the potential to be used for diagnostic imaging and therapeutic delivery. However, the transition from microbubbles currently being used as ultrasound contrast agents to achieve its’ potentials in the biomedical field requires more in depth understanding. Of particular importance is the influence of microbubble encapsulation of a microbubble near a vessel wall on the dynamical behaviour as it stabilizes the bubble. However, many bubble studies do not consider shell encapsulation in their studies. In this work, the dynamics of an encapsulated microbubble near a boundary was studied by numerically solving the governing equations for microbubble oscillation. In order to elucidate the effects of a boundary to the non-linear microbubble oscillation the separation distances between microbubble will be varied along with the acoustic driving. The complex nonlinear vibration response was studied in terms of bifurcation diagrams and the maximum radial expansion. It was found that the increase in distance between the boundary and the encapsulated bubble will increase the oscillation amplitude. When the value of pressure amplitude increased the single bubble is more likely to exhibit the chaotic behaviour and maximum radius also increase as the inter wall-bubble distance is gradually increased. While, with higher driving frequency the maximum radial expansion decreases and suppress the chaotic behaviour.

Download Full-text

Removal of burrs from the surface of parts of switching equipment in a high-intensity ultrasonic field

Modern technologies System analysis Modeling ◽

10.26731/1813-9108.2019.2(62).33-40 ◽

2019 ◽

Vol 2(62) (2(62)) ◽

Keyword(s):

High Intensity ◽

Ultrasonic Field ◽

Switching Equipment

Download Full-text

Воздействиеультразвуковогополянадинамическуювязкостьводы

Vodosnabzhenie i sanitarnaia tehnika ◽

10.35776/mnp.2019.09.04 ◽

2019 ◽

pp. 27-29

Author(s):

P. Vikulin ◽

K. Khlopov ◽

M. Cherkashin

Keyword(s):

Dynamic Viscosity ◽

Experimental Studies ◽

Ultrasonic Field ◽

Maximum Effect ◽

Ultrasonic Frequency ◽

Ultrasonic Vibrations ◽

Wastewater Disposal ◽

Laboratory Setup ◽

Sonic Treatment ◽

The Impact

Enhancing water purification processes is provided by various methods including physical ones, in particular, exposure to ultrasonic vibrations. The change in the dynamic viscosity of water affects the rate of deposition of particles in the aquatic environment which can be used in natural and wastewater treatment. At the Department Water Supply and Wastewater Disposal of the National Research Moscow State University of Civil Engineering experimental studies were conducted under laboratory conditions to study the effect of ultrasound on the change in the dynamic viscosity of water. A laboratory setup has been designed consisting of an ultrasonic frequency generator of the relative intensity, a transducer (concentrator) that transmits ultrasonic vibrations to the source water, and sonic treatment tanks. Experimental studies on the impact of the ultrasonic field in the cavitation mode on the dynamic viscosity of the aqueous medium were carried out the exposure time was obtained to achieve the maximum effect.Интенсификация процессов очистки воды осуществляется с помощью различных методов, в том числе и физических, в частности воздействием ультразвуковых колебаний. Изменение динамической вязкости воды влияет на скорость осаждения частиц в водной среде, что может быть использовано в процессах очистки природных и сточных вод. На кафедре Водоснабжение и водоотведение Национального исследовательского Московского государственного строительного университета в лабораторных условиях проведены экспериментальные исследования по изучению влияния ультразвука на изменение динамической вязкости воды. Разработана схема лабораторной установки, состоящая из генератора ультразвуковых частот с соответствующей интенсивностью, преобразователя (концентратора), передающего ультразвуковые колебания в исходную воду, и емкости для озвучивания. Выполнены экспериментальные исследования по влиянию ультразвукового поля в режиме кавитации на динамическую вязкость водной среды, получено время экспозиции для достижения максимального эффекта.

Download Full-text

Corrosion Resistance of Ni-CeO2 Nanocomposite Coatings Prepared by Pulse Electrodeposition in an Ultrasonic Field

Journal of Inorganic Materials ◽

10.3724/sp.j.1077.2010.00522 ◽

2010 ◽

Vol 25 (5) ◽

pp. 522-526

Author(s):

Yu-Jun XUE ◽

Hong-Bin LIU ◽

Ming-Ming LAN ◽

Hong-Biao HAN ◽

Ji-Shun LI

Keyword(s):

Corrosion Resistance ◽

Ultrasonic Field ◽

Pulse Electrodeposition ◽

Nanocomposite Coatings

Download Full-text

Antimicrobial Activity of Silver Nanoparticles Prepared Under an Ultrasonic Field

International Journal of Pharmaceutical Sciences and Nanotechnology ◽

10.37285/ijpsn.2011.4.3.8 ◽

2011 ◽

Vol 4 (3) ◽

pp. 1491-1496

Author(s):

Umadevi M ◽

Rani T ◽

Balakrishnan T ◽

Ramanibai R

Keyword(s):

Escherichia Coli ◽

Antimicrobial Activity ◽

Silver Nanoparticles ◽

Reduction Method ◽

Therapeutic Potential ◽

Chemical Reduction ◽

Ultrasonic Field ◽

Great Promise ◽

Chemical Reduction Method ◽

E Coli

Nanotechnology has great promise for improving the therapeutic potential of medicinal molecules and related agents. In this study, silver nanoparticles of different sizes were synthesized in an ultrasonic field using the chemical reduction method with sodium borohydride as a reducing agent. The size effect of silver nanoparticles on antimicrobial activity were tested against the microorganisms Staphylococcus aureus (MTCC No. 96), Bacillus subtilis (MTCC No. 441), Streptococcus mutans (MTCC No. 497), Escherichia coli (MTCC No. 739) and Pseudomonas aeruginosa (MTCC No. 1934). The results shows that B. subtilis, and E. coli were more sensitive to silver nanoparticles and its size, indicating the superior antimicrobial efficacy of silver nanoparticles.

Download Full-text

Changes of some sewage sludge parameters prepared with an ultrasonic field

Water Science & Technology ◽

10.2166/wst.1997.0399 ◽

1997 ◽

Vol 36 (11) ◽

pp. 101-106 ◽

Cited By ~ 15

Author(s):

January Bien ◽

Lidia Wolny

Keyword(s):

Sewage Sludge ◽

Microscopic Analysis ◽

Chemical Compounds ◽

Ultrasonic Field ◽

Water Removal ◽

Vacuum Filter ◽

Additional Criterion ◽

New Methods ◽

Sludge Conditioning

Studies of sewage sludge conditioning by ultrasonic field concentrate on determination of the increase of water removal effect, which depends on kind of sludge and chemical compounds used in the dewatering process. An attempt was made to find new methods of sludge preparation before dewatering. Tests presented here focused on digested and difficult dewatered sludge. The sludge was dewatered on a vacuum filter after conditioning with polyelectrolytes and the ultrasonic field. The microscopic analysis was an additional criterion to evaluate changes in the sludge structure after preparation. The polyelectrolyte dose of 3 mg/g d.m. sonicated within 15 sec. resulted in the 50% decrease of sludge volume. Results presented confirmed our previous experiences, concerning the relation between conglomerates of sludge and the effect of dewatering.

Download Full-text