Relevant bibliographies by topics / Acoustic and hydrodynamic cavitation

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Acoustic and hydrodynamic cavitation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Acoustic and hydrodynamic cavitation"

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Ferrari, A. "Fluid dynamics of acoustic and hydrodynamic cavitation in hydraulic power systems." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, no. 2199 (2017): 20160345. http://dx.doi.org/10.1098/rspa.2016.0345.

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Cavitation is the transition from a liquid to a vapour phase, due to a drop in pressure to the level of the vapour tension of the fluid. Two kinds of cavitation have been reviewed here: acoustic cavitation and hydrodynamic cavitation. As acoustic cavitation in engineering systems is related to the propagation of waves through a region subjected to liquid vaporization, the available expressions of the sound speed are discussed. One of the main effects of hydrodynamic cavitation in the nozzles and orifices of hydraulic power systems is a reduction in flow permeability. Different discharge coefficient formulae are analysed in this paper: the Reynolds number and the cavitation number result to be the key fluid dynamical parameters for liquid and cavitating flows, respectively. The latest advances in the characterization of different cavitation regimes in a nozzle, as the cavitation number reduces, are presented. The physical cause of choked flows is explained, and an analogy between cavitation and supersonic aerodynamic flows is proposed. The main approaches to cavitation modelling in hydraulic power systems are also reviewed: these are divided into homogeneous-mixture and two-phase models. The homogeneous-mixture models are further subdivided into barotropic and baroclinic models. The advantages and disadvantages of an implementation of the complete Rayleigh–Plesset equation are examined.
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Chatterjee, Dhiman, and Vijay H. Arakeri. "Towards the concept of hydrodynamic cavitation control." Journal of Fluid Mechanics 332 (February 1997): 377–94. http://dx.doi.org/10.1017/s0022112096004223.

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A careful study of the existing literature available in the field of cavitation reveals the potential of ultrasonics as a tool for controlling and, if possible, eliminating certain types of hydrodynamic cavitation through the manipulation of nuclei size present in a flow. A glass venturi is taken to be an ideal device to study the cavitation phenomenon at its throat and its potential control. A piezoelectric transducer, driven at the crystal resonant frequency, is used to generate an acoustic pressure field and is termed an ‘ultrasonic nuclei manipulator (UNM)'. Electrolysis bubbles serve as artificial nuclei to produce travelling bubble cavitation at the venturi throat in the absence of a UNM but this cavitation is completely eliminated when a UNM is operative. This is made possible because the nuclei, which pass through the acoustic field first, cavitate, collapse violently and perhaps fragment and go into dissolution before reaching the venturi throat. Thus, the potential nuclei for travelling bubble cavitation at the venturi throat seem to be systematically destroyed through acoustic cavitation near the UNM. From the solution to the bubble dynamics equation, it has been shown that the potential energy of a bubble at its maximum radius due to an acoustic field is negligible compared to that for the hydrodynamic field. Hence, even though the control of hydrodynamic macro cavitation achieved in this way is at the expense of acoustic micro cavitation, it can still be considered to be a significant gain. These are some of the first results in this direction.
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Jyoti, K. K., and A. B. Pandit. "Water disinfection by acoustic and hydrodynamic cavitation." Biochemical Engineering Journal 7, no. 3 (2001): 201–12. http://dx.doi.org/10.1016/s1369-703x(00)00128-5.

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Kiu, Stephen Sie Kiong, Suzana Yusup, Chok Vui Soon, Taufiq Arpin, and Syahrullail Samion. "Lubricant Enhancement via Hydrodynamic and Acoustic Cavitation." Procedia Engineering 148 (2016): 57–63. http://dx.doi.org/10.1016/j.proeng.2016.06.493.

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Kalumuck, K. M., and G. L. Chahine. "The Use of Cavitating Jets to Oxidize Organic Compounds in Water." Journal of Fluids Engineering 122, no. 3 (2000): 465–70. http://dx.doi.org/10.1115/1.1286993.

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Exposure to ultrasonic acoustic waves can greatly enhance various chemical reactions. Ultrasonic acoustic irradiation of organic compounds in aqueous solution results in oxidation of these compounds. The mechanism producing this behavior is the inducement of the growth and collapse of cavitation bubbles driven by the high frequency acoustic pressure fluctuations. Cavitation bubble collapse produces extremely high local pressures and temperatures. Such conditions are believed to produce hydroxyl radicals which are strong oxidizing agents. We have applied hydrodynamic cavitation to contaminated water by the use of submerged cavitating liquid jets to trigger widespread cavitation and induce oxidation in the bulk solution. Experiments were conducted in recirculating flow loops using a variety of cavitating jet configurations and operating conditions with dilute aqueous solutions of p-nitrophenol (PNP) of known concentration. Temperature, pH, ambient and jet pressures, and flow rates were controlled and systematically varied. Samples of the liquid were taken and the concentration of PNP measured with a spectrophotometer. Experiments were conducted in parallel with an ultrasonic horn for comparison. Submerged cavitating liquid jets were found to generate a two order of magnitude increase in energy efficiency compared to the ultrasonic means. [S0098-2202(00)00303-5]
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Yi, Chunhai, Qianqian Lu, Yun Wang, Yixuan Wang, and Bolun Yang. "Degradation of organic wastewater by hydrodynamic cavitation combined with acoustic cavitation." Ultrasonics Sonochemistry 43 (May 2018): 156–65. http://dx.doi.org/10.1016/j.ultsonch.2018.01.013.

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Wu, Pengfei, Lixin Bai, Weijun Lin, and Xiuming Wang. "Mechanism and dynamics of hydrodynamic-acoustic cavitation (HAC)." Ultrasonics Sonochemistry 49 (December 2018): 89–96. http://dx.doi.org/10.1016/j.ultsonch.2018.07.021.

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Sukhatskiy, Yurii, Zenovii Znak, Olha Zin, and Dmytro Chupinskyi. "Ultrasonic Cavitation in Wastewater Treatment from Azo Dye Methyl Orange." Chemistry & Chemical Technology 15, no. 2 (2021): 284–90. http://dx.doi.org/10.23939/chcht15.02.284.

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The work is devoted to the study of reagent treatment of methyl orange mono azo dye under the action of acoustic vibrations of the ultrasonic range. The positive effect of cavitation phenomena on the rate of mineralization of azo dye (13.4% increase) was compared with the reagent treatment of the solution without ultrasonic vibrations. On the basis of the analyzed information sources and experimental results, a schematic technological scheme of cavitation-reagent mineralization of methyl orange was developed, the main apparatus of which is a hydrodynamic jet cavitator (scaling for industry).
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Chen, Hong, and Elisa E. Konofagou. "The Size of Blood–Brain Barrier Opening Induced by Focused Ultrasound is Dictated by the Acoustic Pressure." Journal of Cerebral Blood Flow & Metabolism 34, no. 7 (2014): 1197–204. http://dx.doi.org/10.1038/jcbfm.2014.71.

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Focused ultrasound (FUS) in combination with microbubbles (MBs) has been successfully used in the delivery of various-size therapeutic agents across the blood–brain barrier (BBB). This study revealed that FUS-induced BBB opening size, defined by the size of the largest molecule that can permeate through the BBB, can be controlled by the acoustic pressure as dictated by cavitational mechanisms. Focused ultrasound was applied onto the mouse hippocampus in the presence of systemically administered MBs for trans-BBB delivery of fluorescently labeled dextrans with molecular weights 3 to 2,000 kDa (hydrodynamic diameter: 2.3 to 54.4 nm). The dextran delivery outcomes were evaluated using ex vivo fluorescence imaging. Cavitation detection was employed to monitor the MB cavitation activity associated with the delivery of these agents. It was found that the BBB opening size was smaller than 3 kDa (2.3 nm) at 0.31 MPa, up to 70 kDa (10.2 nm) at 0.51 MPa, and up to 2,000 kDa (54.4 nm) at 0.84 MPa. Relatively smaller opening size (up to 70 kDa) was achieved with stable cavitation only; however, inertial cavitation was associated with relatively larger BBB opening size (above 500 kDa). These findings indicate that the BBB opening size can be controlled by the acoustic pressure and predicted using cavitation detection.
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Johansson, Örjan, Taraka Pamidi, and Vijay Shankar. "Extraction of tungsten from scheelite using hydrodynamic and acoustic cavitation." Ultrasonics Sonochemistry 71 (March 2021): 105408. http://dx.doi.org/10.1016/j.ultsonch.2020.105408.

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Dissertations / Theses on the topic "Acoustic and hydrodynamic cavitation"

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Pamidi, Taraka Rama Krishna. "Process Intensification by Ultrasound Controlled Cavitation." Licentiate thesis, Luleå tekniska universitet, Drift, underhåll och akustik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-73856.

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Process industries are cornerstones in today’s industrialized society. They contribute significantly in the manufacturing of various goods and products that are used in our day-to-day life. Our society’s paradigm of consumerism accompanied by a rise in global population drives an ever increasing demand for goods. One of many strategies developed to satisfy these demands and at the same time improve production capabilities is known as process intensification. As an example, this can be accomplished by implementation of devices using the principle of hydrodynamic and acoustic cavitation. High-intensity cavitation in the ultrasonic range can change the physical and chemical properties of a wide range of substances and hence, improve the production rate or quality. Despite the generally accepted benefits of hydrodynamic and acoustic cavitation, applications in the process industry are yet limited. The reasons are that the method requires extensive optimization, which depends on multiple process parameters and encounters problem in the implementation on a larger scale. Scalable cavitation reactor concepts for industrial applications need to meet challenges like stability and robustness, energy efficiency and high flow rates. This thesis focuses on the methodology for the design and optimization of a flow through cavitation reactor. An ultrasound reactor concept has been developed and tested for two different applications: i) Fibrillation processes typical for paper and pulp industry; ii) Metal leaching of mineral concentrates. Simulations were carried out using a commercially available software for multiphysics modeling which combines acoustics, structural dynamics, fluid dynamics and piezoelectrics. However, the optimization procedure requires extensive experimental work in parallel with multi-physical simulations. In general, the application leads to hydrodynamic initiation of small gas bubbles in the fluid to be excited and collapsed by high-intensity ultrasound. This transient collapse of the cavitation bubbles provides both mechanical and chemical effect on materials. The developed reactor has a power conversion efficiency of 36% in batch mode and is well suited for a scale-up. In flow-through mode, the cavitation effect improves extensively and provides stable results. Energy efficiency requires hydrodynamic initiation of cavitation bubbles, high acoustic cavitation intensity by multiple excitation frequencies adapted to the optimized reactor geometry, as well as optimal process pressure and temperature with respect to the materials to be treated. The impact of flow conditions and hydrodynamic cavitation is significant and almost doubles the yield at the same ultrasonic power input. In the case of fibrillation of cellulose fibers, results obtained indicate that generated cavitation intensity changes the mechanical properties of the fiber wall. In the case of leaching, experiments show that six hours of exposure gave a 57% recovery of tungsten from the scheelite concentrate at 80°C and atmospheric pressure. Future research will focus on different types of excitation signals, extended reactor volume, increased flow rates and use of a higher process temperature.
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Cameron, Peter J. K. "An acoustic countermeasure to supercavitating torpedoes." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29666.

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Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Rogers, P. H.; Committee Member: Ferri, A. A.; Committee Member: Ruzzene, M.; Committee Member: Smith, M. K.; Committee Member: Trivett, D.; Committee Member: Zinn, B. T. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Kuhn, de Chizelle Yan P. Acosta Allan J. Brennen Christopher E. "Hydrodynamics, acoustics and scaling of traveling bubble cavitation /." Diss., Pasadena, Calif. : California Institute of Technology, 1994. http://resolver.caltech.edu/CaltechETD:etd-10202005-152545.

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Odeyemi, Babatunde O. "Hydrodynamic cavitation : effects of cavitation on inactivation of Escherichia coli (E.coli)." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/11009.

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Chanda, Suranjit Kumar. "Disintegration of sludge using ozone-hydrodynamic cavitation." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43105.

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In our study we applied hydrodynamic cavitation and ozonation both separately and combined, to determine the synergistic effect of these two technologies for sludge disintegration. A 2 mm orifice was used as a cavitation device. Ozone was injected after cavitation at a concentration of 35 mg/L at a flow of 3 Lpm. The sludge was subjected to treatment for 90 minutes in all three cases. In a final step, combined ozone and cavitation was applied to disintegrate the sludge for 10 hours. It was found that the combination of ozonation and cavitation exhibited higher sludge disintegration capacity than the individual technologies applied alone. About 31% of VSS was reduced by the combined system, whereas 19% was reduced by ozone and only 4% was reduced by cavitation alone after 90 minutes of treatment. Soluble chemical oxygen demand (SCOD) was increased by approximately 1600 mg/L in the combined system, which was much higher than the individual effect observed with either ozone or cavitation alone. About 75% of this SCOD was found to be biodegradable. In the combined system, soluble TOC increased by approximately 1.5 times the amount released by ozone alone, indicating higher release of organic matter from biomass. Only cavitation did not show any significant release of soluble total organic carbon (TOC) compared to the other treatments. In combined application, soluble biochemical oxygen demand (BOD) increased to 420 mg/L, which was significantly higher than the increase of BOD due to the application of ozone alone which was 260 mg/L. Based on the SCOD, it was found that a maximum of 50% of the sludge could be solubilised in 10 hours of combined treatment. It was also found that with ozone-cavitation, approximately 26% of the total sludge phosphorus was released to the solution after 10 hours, although most of the release occured within the first 2 hours. Within the operating conditions applied, cavitation itself was not sufficient for the disintegration of sludge, although better disintegration was found in combined application at higher inlet pressure. In the case of ozonation alone, higher disintegration was obtained at longer ozonation time.
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Lesko, Timothy Michael McKoy Vincent. "Chemical effects of acoustic cavitation /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-04262004-184449.

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Skelton, Hedley John. "Applying hydrodynamic cavitation to the activated sludge process." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613352.

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Tran, David. "Hydrodynamic cavitation applied to food waste anaerobic digestion." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128268.

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Innovative pre-treatment methods applied to anaerobic digestion (AD) have developed to enhance the methane yields of food waste. This study investigates hydrodynamic cavitation, which induce disintegration of biomass through microbubble formations, impact on food waste solubilisation and methane production during following AD. Two different sub-streams of food waste (before and after the digestion) pre-treated by hydrodynamic cavitation were evaluated in lab scale for its potential for implementation in a full scale practise. First, the optimum condition for the hydrodynamic cavitation device was determined based on the solids and chemical changes in the food waste. The exposure time was referred to as the number of cycles that the sample was recirculated through the cavitation inducer’s region. The optimal cycles were later tested as a pre-treatment step in a BMP test and semi-CSTR lab scale operation. The tests showed that sufficient impact from the hydrodynamic cavitation was achieved by 20 cavitation cycles. Due to the pre-treatment, food waste solubilisation increased, up to 400% and 48% in terms of turbidity and sCOD measurements, respectively. In the BMP test, the treated samples improved the methane yield by 9-13%, where the digested food waste increased its kinetic constant by 60%. Fresh food waste was then processed in the semi-CSTR operation and the methane yield was increased by up to 17% with hydrodynamic cavitation for two reference periods. These promising results suggest that the hydrodynamic cavitation can be implemented for full scale production with food waste.
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Abrahamsson, Louise. "Improving methane production using hydrodynamic cavitation as pre-treatment." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128783.

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To develop anaerobic digestion (AD), innovative solutions to increase methane yields in existing AD processes are needed. In particular, the adoption of low energy pre-treatments to enhance biomass biodegradability is needed to provide efficient digestion processes increasing profitability. To obtain these features, hydrodynamic cavitation has been evaluated as an innovative solutions for AD of waste activated sludge (WAS), food waste (FW), macro algae and grass, in comparison with steam explosion (high energy pre-treatment). The effect of these two pre-treatments on the substrates, e.g. particle size distribution, soluble chemical oxygen demand (sCOD), biochemical methane potential (BMP) and biodegradability rate, have been evaluated. After two minutes of hydrodynamic cavitation (8 bar), the mean fine particle size decreased from 489- 1344 nm to 277- 381 nm (≤77% reduction) depending of the biomasses. Similar impacts were observed after ten minutes of steam explosion (210 °C, 30 bar) with a reduction in particle size between 40% and 70% for all the substrates treated.  In terms of BMP value, hydrodynamic cavitation caused significant increment only within the A. nodosum showing a post treatment increment of 44% compared to the untreated value, while similar values were obtained before and after treatment within the other tested substrates. In contrast, steam explosion allowed an increment for all treated samples, A. nodosum (+86%), grass (14%) and S. latissima (4%). However, greater impacts where observed with hydrodynamic cavitation than steam explosion when comparing the kinetic constant K. Overall, hydrodynamic cavitation appeared an efficient pre-treatment for AD capable to compete with the traditional steam explosion in terms om kinetics and providing a more efficient energy balance (+14%) as well as methane yield for A. nodosum.<br>Det behövs innovativa lösningar för att utveckla anaerob rötning i syfte att öka metangasutbytet från biogassubstrat. Beroende på substratets egenskaper, kan förbehandling möjliggöra sönderdelning av bakterieflockar, uppbrytning av cellväggar, elimination av inhiberande ämnen och frigörelse av intracellulära organiska ämnen, som alla kan leda till en förbättring av den biologiska nedbrytningen i rötningen. För att uppnå detta har den lågenergikrävande förebehandlingsmetoden hydrodynamisk kavitation prövats på biologiskt slam, matavfall, makroalger respektive gräs, i jämförelse med ångexplosion. Effekten på substraten av dessa två förbehandlingar har uppmäts genom att undersöka distribution av partikelstorlek, löst organiskt kol (sCOD), biometan potential (BMP) och nedbrytningshastigheten. Efter 2 minuters hydrodynamisk kavitation (8 bar) minskade partikelstorleken från 489- 1344 nm till 277- 281 nm (≤77 % reduktion) för de olika biomassorna. Liknande påverkan observerades efter tio minuters ångexplosion (210 °C, 30 bar) med en partikelstorlekreducering mellan 40 och 70 % för alla behandlade substrat. Efter behandling med hydrodynamisk kavitation, i jämförelse med obehandlad biomassa, ökade metanproduktionens hastighetskonstant (K) för matavfall (+65%), makroalgen S. latissima (+3%), gräs (+16 %) samtidigt som den minskade för A. nodosum (-17 %). Förbehandlingen med ångexplosion ökade hastighetskonstanten för S. latissima (+50 %) och A. nodosum (+65 %) medan den minskade för gräs (-37 %), i jämförelse med obehandlad biomassa. Vad gäller BMP värden, orsakade hydrodynamisk kavitation små variationer där endast A. nodosum visade en ökning efter behandling (+44 %) i jämförelse med obehandlad biomassa. Biomassa förbehandlade med ångexplosion visade en ökning för A .nodosum (+86 %), gräs (14 %) och S. latissima (4 %). Sammantaget visar hydrodynamisk kavitation potential som en effektiv behandling före rötning och kapabel att konkurrera med den traditionella ångexplosionen gällande kinetik och energibalans (+14%) samt metanutbytet för A. nodosum.
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Zhang, Siyuan. "Biofilm Removal with Acoustic Cavitation and Lavage." University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1356194652.

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Books on the topic "Acoustic and hydrodynamic cavitation"

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Yasui, Kyuichi. Acoustic Cavitation and Bubble Dynamics. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68237-2.

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Round, Carl Graham. Mathematical modelling of acoustic cavitation and sonoluminescence. University of Birmingham, 1997.

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Mullan, Dermott J. Acoustic and magnetic heating of chromospheres/coronae: Are there distinct signatures? : final technical report for grant NAG 5 3046. National Aeronautics and Space Administration, 1996.

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Ranade, Vivek V. Hydrodynamic Cavitation: Devices, Design and Applications. Wiley & Sons, Limited, John, 2021.

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Ozonek, Janusz. Application of Hydrodynamic Cavitation in Environmental Engineering. Taylor & Francis Group, 2012.

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Ozonek, Janusz. Application of Hydrodynamic Cavitation in Environmental Engineering. Taylor & Francis Group, 2012.

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Application Of Hydrodynamic Cavitation In Environmental Engineering. CRC Press, 2012.

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Ozonek, Janusz. Application of Hydrodynamic Cavitation in Environmental Engineering. Taylor & Francis Group, 2012.

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Ozonek, Janusz. Application of Hydrodynamic Cavitation in Environmental Engineering. CRC Press, 2012. http://dx.doi.org/10.1201/b11825.

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Ozonek, Janusz. Application of Hydrodynamic Cavitation in Environmental Engineering. Taylor & Francis Group, 2012.

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Book chapters on the topic "Acoustic and hydrodynamic cavitation"

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Braeutigam, Patrick. "Degradation of Organic Micropollutants by Hydrodynamic and/or Acoustic Cavitation." In Handbook of Ultrasonics and Sonochemistry. Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-470-2_56-1.

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Cravotto, Giancarlo, Silvia Tagliapietra, and Zhilin Wu. "CHAPTER 7. Green Synthetic Procedures under Hydrodynamic and Acoustic Cavitation." In Green Chemistry Series. Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/9781788016131-00141.

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Braeutigam, Patrick. "Degradation of Organic Micropollutants by Hydrodynamic and/or Acoustic Cavitation." In Handbook of Ultrasonics and Sonochemistry. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-287-278-4_56.

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Sonawane, Shirish H., and Ravindra D. Kulkarni. "Acoustic and Hydrodynamic Cavitations for Nano CaCO3 Synthesis." In Theoretical and Experimental Sonochemistry Involving Inorganic Systems. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3887-6_7.

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Brujan, Emil-Alexandru. "Hydrodynamic Cavitation." In Cavitation in Non-Newtonian Fluids. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15343-3_4.

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Louisnard, Olivier, and José González-García. "Acoustic Cavitation." In Food Engineering Series. Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7472-3_2.

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Yasui, Kyuichi. "Acoustic Cavitation." In SpringerBriefs in Molecular Science. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68237-2_1.

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Gogate, Parag R., and Aniruddha B. Pandit. "Cavitation Generation and Usage Without Ultrasound: Hydrodynamic Cavitation." In Theoretical and Experimental Sonochemistry Involving Inorganic Systems. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3887-6_3.

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Manuello, A., R. Malvano, O. Borla, A. Palumbo, and A. Carpinteri. "Neutron Emissions from Hydrodynamic Cavitation." In Fracture, Fatigue, Failure and Damage Evolution, Volume 8. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-21611-9_22.

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Bark, Göran, and Rickard E. Bensow. "Hydrodynamic Processes Controlling Cavitation Erosion." In Advanced Experimental and Numerical Techniques for Cavitation Erosion Prediction. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8539-6_8.

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Conference papers on the topic "Acoustic and hydrodynamic cavitation"

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Wu, Pengfei, Lixin Bai, Weijun Lin, Delong Xu, and Chao Li. "Image analysis of Hydrodynamic-Acoustic-Cavitation." In 2017 ICU Honolulu: Sixth International Congress on Ultrasonics. Acoustical Society of America, 2017. http://dx.doi.org/10.1121/2.0000699.

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Moura, Alceu, Ricardo Sbragio, HELIO CORREA DA SILVA JUNIOR, Leandro Pansanato, and Walfrido Barnack. "Hydrodynamic and acoustic characteristics of the LABHIDRO’s small cavitation tunnel." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-0823.

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Závorka, Dalibor, and Vladimír Habán. "Monitoring of hydraulic machines and hydrodynamic cavitation using acoustic emissions." In 37TH MEETING OF DEPARTMENTS OF FLUID MECHANICS AND THERMODYNAMICS. Author(s), 2018. http://dx.doi.org/10.1063/1.5049930.

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Soyama, Hitoshi. "Luminescent Spots Induced by a Cavitating Jet." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-33018.

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As cavitation bubble collapses cause hot spots and/or radicals such as hydroxyl radical, luminescence was observed at bubble collapsing region. The luminescence induced by acoustic cavitation is named as sonoluminescence. In the present paper, luminescence induced by hydrodynamic cavitation was investigated. In order to generate hydrodynamic cavitation, a high-speed water jet was injected into a water-filled chamber. This sort of the jet with cavitation is called as a cavitating jet. The intensity of luminescence of the cavitating jet was evaluated by a luminescence analyzer and the aspect of the cavitating jet was observed by a cooled electron multiplication charged-coupled device camera. It was revealed that the luminescent spots induced by the cavitating jet were observed by the camera.
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Welz, Joseph P., Matthew P. Iannacci, and David M. Jenkins. "Cavitation Detection Using Wavelet Denoising." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56804.

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Cavitation in turbomachinery provides a source of damage to the hydrodynamic surfaces. Detection of cavitation at the earliest possible time after inception is desirable from a damage prevention standpoint. In order to detect cavitation in real time, acoustic sensing of the cavitation events has long been an accepted practice. A problem with this measurement technique is the potential contamination from electrical and acoustic background noise sources. This work employs an algorithm based on wavelet denoising. The wavelet denoising algorithm depends on a measurement of the acoustic background noise in the absence of cavitation. Cavitation measurements of a stationary object are evaluated with and without the application of the denoising process. The results of this comparison indicate that the wavelet denoising procedure allows an increased number of cavitation events to be detected at a given static pressure, and cavitation is detected at higher pressures than previous techniques.
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Mori, Takayuki, Kenji Naganuma, Risa Kimoto, Ryo Yakushiji, and Shigeki Nagaya. "Hydrodynamic and Hydroacoustic Characteristics of the Flow Noise Simulator (Keynote)." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37531.

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The Flow Noise Simulator (FNS) is a new large and quiet cavitation tunnel constructed by Naval Ship Systems Research Center of TRDI/Ministry of Defense, Japan for naval hydrodynamic and hydroacoustic research. This paper describes several results obtained from the initial evaluation tests of the facility involving, 1) flow uniformity and turbulent intensity at the test section, 2) LDV (Laser Doppler Velocimetry, 3) High Reynolds number turbulent boundary layer on the test section wall, 4) Acoustic noise source detection capability of the hydrophone array.
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Ivanov, Evgueniy. "Acoustic signal control in disc vortex chamber of hydrodynamic cavitator." In 20th International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, Faculty of Engineering, 2021. http://dx.doi.org/10.22616/erdev.2021.20.tf026.

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8

Seto, Mae L., Rubens Campregher, Stefan Murphy, and Julio Militzer. "Prediction of Ship Acoustic Signature Due to Fluid Flow." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43343.

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The contribution of flow noise to the radiated acoustic signature of CFAV Quest is of interest. Quest is the research ship used by Defence R&amp;D Canada as a quiet platform. It is difficult to identify the flow noise component in an acoustic ranging so there is interest in predicting the flow noise as a first step towards extracting it from range measurements. Below propulsor cavitation inception speeds, machinery-induced noise dominates. While flow noise does not usually dominate in the presence of machinery-induced noise or propulsor cavitation, it is unclear what fraction of the total noise power flow noise constitutes. A direct numerical simulation for a complex ship geometry was impractical so an alternative approach was sought. An immersed boundary method was used to model the presence of the ship in the flow domain. The unsteady flow field was calculated using a finite volume method over an unstructured Cartesian grid. The flow field around Quest in straight and level flight was calculated at Reynolds numbers between 1.8×108 and 4.3×108, corresponding to a full-scale speed range of 4 to 10 knots. Results from such flow field predictions become the hydrodynamic sources in the integrals of Lighthill’s acoustic analogy to predict the far-field acoustic signature from the flow past the hull. These far-field predictions consist of computing the propagation and radiation of the hydrodynamic sources. This assumes noise generation and its propagation are decoupled. Under certain circumstances, knowledge of the predicted flow component helps to extract it from a standard acoustic ranging.
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Oweis, Ghanem F., Jaehyug Choi, and Steven L. Ceccio. "Dynamics and Noise Emission of Laser Induced Bubbles in a Vortical Flow Field." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45484.

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The sound produced by the collapse of discreet cavitation bubbles was examined. Laser-generated cavitation bubbles were produced in both a quiescent and a vortical flow. The sound produced by the collapse of the cavitation bubbles was recorded, and its spectral content was determined. It was found that the rise time of the sound pulse produced by the collapse of single, spherical cavitation bubbles in quiescent fluid exceeded that of the slew-rate of the hydrophone, which is consistent with previously published results. It was found that, as the collapsing bubbles were deformed by the vortical flow, the acoustic impulse of the bubbles was reduced. Collapsing non-spherical bubbles often created a sound pulse with a rise time that exceeded that of the hydrophone slew-rate, although the acoustic impulse created by the bubbles was influenced largely by the degree to which the bubbles became non-spherical before collapse. The noise produced by the growth of cavitation bubbles in the vortex core was not measurable. These results have implications for the interpretation of hydrodynamic cavitation noise.
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Matveev, Konstantin I. "On the Influence of Artificial Cavitation on Underwater Noise Radiation From a Ship Hull." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59075.

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With increasing speed and power of next-generation combat and transport surface ships, the reduction of the magnitude of the ship acoustic signature becomes a vital task of naval engineering. Another related problem is to decrease the self-noise affecting operations of the ship’s own sonar. Currently, sponsors of naval research are encouraging the investigation of new methods for noise reduction, alternative to the usual weight-increasing enhancement of damping and insulating structures. One of the advanced concepts for future marine transportation is the use of artificial cavitation on a hull to reduce hydrodynamic drag and associated power requirements. Since this concept involves the application of air layers and possibly bubbly mixtures at the hull surfaces, underwater sound radiation properties of this ship type can differ significantly from those of traditional vessels. This paper deals with some major components of ship noise originating inside a ship and on its hull surface. The effects of the presence of gaseous layers on underwater radiation of ship’s noise are considered. Estimated results are presented for typical parameters of ships with artificial cavitation.
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Reports on the topic "Acoustic and hydrodynamic cavitation"

1

Park, Joel T., J. M. Cutbirth, and Wesley H. Brewer. Hydrodynamic Performance of the Large Cavitation Channel (LCC). Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada416700.

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2

Thomas, Catherine, Afrachanna Butler, Victor Medina, Chris Griggs, and Alan Katzenmeyer. Physicochemical treatment of cyanobacteria and microcystin by hydrodynamic cavitation and advanced oxidation. Engineer Research and Development Center (U.S.), 2019. http://dx.doi.org/10.21079/11681/32313.

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