Relevant bibliographies by topics / Ultrasonic atomiser

Academic literature on the topic 'Ultrasonic atomiser'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Ultrasonic atomiser"

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Chen, Yan, Chunyan Ma, Zaihe Shen, and Rui Chen. "Research on Vibration Characteristics of Piezoelectric Ceramic Atomizer Based on ANSYS." E3S Web of Conferences 118 (2019): 02043. http://dx.doi.org/10.1051/e3sconf/201911802043.

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In the design and application of ultrasonic atomizer, the resonant frequency and vibration mode of piezoelectric transducer have an effect on the working state and atomization effect of the atomizer. In order to deeply study the piezoelectric ceramic ultrasonic atomizer Vibration characteristics, piezoelectric coupling simulation analysis was performed by ANSYS software, multi-order vibration mode of piezoelectric ceramic atomization sheet obtained by modal analysis method, combined with harmonic response analysis to obtain resonant frequency of piezoelectric ceramic ultrasonic atomization sheet, and analysis the influence of the main size of the atomized sheet on the vibration mode. According to theoretical analysis and experimental tests, the effectiveness of the finite element analysis can be verified, and then provide a theoretical basis for the study of ultrasonic atomizers.
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Thangavadivel, Kandasamy, Gary Owens, and Kenji Okitsu. "Removal of methyl orange from aqueous solution using a 1.6 MHz ultrasonic atomiser." RSC Advances 3, no. 45 (2013): 23370. http://dx.doi.org/10.1039/c3ra44343d.

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Ogihara, Takashi, Toshihiro Ookura, Teruaki Yanagawa, Nobuo Ogata, and Kokichi Yoshida. "Preparation of submicrometre spherical oxide powders and fibres by thermal spray decomposition using an ultrasonic mist atomiser." Journal of Materials Chemistry 1, no. 5 (1991): 789. http://dx.doi.org/10.1039/jm9910100789.

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Arun, BS, and V. Mariappan. "Experimental study of an ultrasonic regenerative evaporative cooler for a desiccant cooling system." Building Services Engineering Research and Technology 40, no. 2 (November 2, 2018): 151–75. http://dx.doi.org/10.1177/0143624418810934.

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This paper presents fabrication of an ultrasonic regenerative evaporative cooler, coupled with a desiccant dehumidifier. Ultrasonic regenerative evaporative cooler consists of several sets of a dry channel and a wet channel. A part of the air from the dry channel is redirected into the wet channel where it is cooled by evaporation of water mist from an ultrasonic atomiser. Air flowing through dry channels is pre-cooled by heat transfer between wet and dry channels, without changing its humidity. In this cooler, the conventional hygroscopic layer for wetting the plate surface is replaced with the water mist. It is observed that the performance of the cooling system significantly depends on the channel spacing, channel length, inlet airflow rate and extraction ratio, and marginally depends upon feed water temperature. The room cooling capacity is eminently responsive to both air mass flow rate and extraction ratio. The maximum available room cooling capacity of 339.8 W is obtained for the optimal values of 0.0488 kg/s mass flow rate of air and 0.37 extraction ratio. The prototype achieved wet-bulb effectiveness values as high as 1.15 and delivered more than 10℃ temperature drop. Practical application: An ultrasonic regenerative evaporative cooler can be coupled with a desiccant dehumidification unit for use in hot and humid climate to achieve comfort condition utilising less energy and feed water when compared to the vapour compression refrigeration system. From this prototype researchers and engineers can develop, by combining desiccant regenerators and evaporative coolers which use ultrasonic method for low-temperature dehydration of desiccant substance. Solar thermal energy can also be directly utilised for marginally heating the desiccant substance during the regeneration process. Overall, this system can contribute to the development of energy efficient buildings.
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Song, Yu-Lin, Chih-Hsiao Cheng, Manoj Kumar Reddy, and Md Saikhul Islam. "Simulation of Onset of the Capillary Surface Wave in the Ultrasonic Atomizer." Micromachines 12, no. 10 (September 23, 2021): 1146. http://dx.doi.org/10.3390/mi12101146.

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The novel drug delivery system refers to the formulations and technologies for transporting a pharmaceutical compound in the body as it is needed to safely achieve its desired therapeutic effects. In this study, the onset vibrational amplitude of capillary surface waves for ultrasonic atomization spray is explained based on Faraday instability. Using ultrasonic frequency, the vibrational amplitude approached a critical point, and the liquid surface broke up into tiny drops. The micro-droplets were are steadily and continuously formed after the liquid feeding rate was optimized. The simulation study reported a minimum vibrational amplitude or onset value of 0.38 μm at 500 kHz frequency. The required minimum energy to atomize the drops was simulated by COMSOL Multiphysics simulation software. The simulation result agreed well with the numerical results of a subharmonic vibrational model that ocurred at 250 kHz frequency on the liquid surface. This newly designed single frequency ultrasonic atomizer showed its true physical characteristic of resonance on the fluid surface plane. Hence, this research will contribute to the future development of a single-frequency ultrasonic nebulizer and mechatronics for the generation of uniform atomized droplets.
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Song, Yu-Lin, Chih-Hsiao Cheng, and Manoj Kumar Reddy. "Numerical Analysis of Ultrasonic Nebulizer for Onset Amplitude of Vibration with Atomization Experimental Results." Water 13, no. 14 (July 19, 2021): 1972. http://dx.doi.org/10.3390/w13141972.

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In this study, the onset amplitude of the initial capillary surface wave for ultrasonic atomization of fluids has been implemented. The design and characterization of 485 kHz microfabricated silicon-based ultrasonic nozzles are presented for the concept of economic energy development. Each nozzle is composed of a silicon resonator and a piezoelectric drive section consisting of three Fourier horns. The required minimum energy to atomize liquid droplets is verified by COMSOL Multiphysics simulation software to clarify experimental data. The simulation study reports a minimum vibrational amplitude (onset) of 0.365 μm at the device bottom under the designated frequency of 485 kHz. The experimental study agrees well with the suggested frequency and the amplitude concerning the corresponding surface vibrational velocity in simulation. While operating, the deionized water was initially atomized into microdroplets at the given electrode voltage of 5.96 V. Microdroplets are steadily and continuously formed after the liquid feeding rate is optimized. This newly designed ultrasonic atomizer facilitates the development of capillary surface wave resonance at a designated frequency. A required vibrational amplitude and finite electric driving voltage promote not only the modern development in the green energy industry, but also the exploration of noninvasive, microencapsulated drug delivery and local spray needs.
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Panatarani, Camellia, Dunden Gilang Muharam, Bambang Mukti Wibawa, and I. Made Joni. "Blue Luminescent of ZnO:Zn Nanocrystal Prepared by One Step Spray Pyrolysis Method." Materials Science Forum 737 (January 2013): 20–27. http://dx.doi.org/10.4028/www.scientific.net/msf.737.20.

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A blue luminescent of ZnO:Zn nanocrystal has been successfully prepared by one step spray pyrolysis method without reducing gas atmosphere. Zinc acetate dihydrate aqueous solutions (0.05 M) were atomized by ultrasonic atomizer. The atomizer used an air as carrier gas with 1, 3 and 5 L/min flowrate. The tubular reactor was set at 500, 600 and 700oC. As prepared samples were characterized by means of x-ray diffraction spectroscopy and scanning electron microscope-energy dispersive x-ray spectroscopy (SEM-EDS). The crystal size of as prepared particles calculated by Scherrer’s equation give 10-20 nm. The luminescent properties of as prepared particles were measured using spectrofluorophotometer. The highest photoluminescent intensity of particles irradiated with excited wavelength of 250 nm was obtained from samples prepared using 5 L/min carrier gas with temperature of tubular reactor 700oC. High intensity of blue luminescent was obtained due to oxygen vacancy in ZnO:Zn.
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E. Tourab, Ahmed, Ana María Blanco-Marigorta, Aly M. Elharidi, and María José Suárez-López. "A Novel Humidification Technique Used in Water Desalination Systems Based on the Humidification–Dehumidification Process: Experimentally and Theoretically." Water 12, no. 8 (August 12, 2020): 2264. http://dx.doi.org/10.3390/w12082264.

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In this paper, an experimental and theoretical investigation is performed on a novel water desalination system based on a humidification–dehumidification technique using a heat pump. An ultrasonic water atomizer is used in the humidification process in order to improve the humidification system. In addition to that, a new configuration is employed in the humidification process (hybrid atomization system), which combines the traditional spraying atomization system and the ultrasonic water atomizer. The new humidification system performance is investigated and compared with the spraying water atomizer system in terms of humidification effectiveness and freshwater productivity. The results show that the ultrasonic water atomizer has enhanced and improved humidification effectiveness, and consequently, the productivity of freshwater. The maximum humidification effectiveness and productivity achieved by the ultrasonic water atomizer are 94.9% and 4.9 kg/h, respectively, meaning an increase of 25.2% and 18.8%, compared to the traditional spraying atomization system. The hybrid system increases humidification effectiveness and productivity by 3.8% and 8.2%, respectively, in comparison with the stand-alone ultrasonic water atomizer. A cost analysis was also carried out in this paper in order to perform an economic comparison of different humidification processes (spraying, ultrasonic; and hybrid atomization systems). The minimum production cost of one liter of freshwater amounts to $0.0311 with the spraying system, $0.0251 with the ultrasonic system, and $0.0250 with the hybrid atomization system. These results reveal the profitability of the new configuration.
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Lakhiar, Imran Ali, Jianmin Gao, Xiuquan Xu, Tabinda Naz Syed, Farman Ali Chandio, Zhou Jing, and Noman Ali Buttar. "Effects of Various Aeroponic Atomizers (Droplet Sizes) on Growth, Polyphenol Content, and Antioxidant Activity of Leaf Lettuce (Lactuca sativa L.)." Transactions of the ASABE 62, no. 6 (2019): 1475–87. http://dx.doi.org/10.13031/trans.13168.

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HighlightsThe atomizer droplet size should be considered an important factor when designing aeroponic systems.Airless atomizers had significant positive effects on plant growth, total polyphenol content, and antioxidant activity.Airless atomizers and a spraying interval of 20 min on and 3 h off was the best combination for lettuce plants.Abstract. Throughout our literature review, the effects of various aeroponic atomizers (droplet sizes) on specific leafy plant growth and quality were minimally reported. Lettuce ( L.) is one of the most popular leafy vegetables consumed around the world. The present study sought to determine the effects of various aeroponic atomizers (droplet sizes) on the growth, total polyphenol content, and antioxidant activity of lettuce plants. Aeroponic systems were designed and manufactured using three kinds of atomizers: air-based (A1), airless (A2), and ultrasonic fogger (A3). The South China Agricultural leafy vegetable B nutrient solution was selected as the cultivating solution. Additionally, the spraying time and spraying interval were set at 20 min on and 3 h off. The sizes of the droplets generated by these atomizers were measured using a laser particle size analyzer, and the measured average droplet sizes generated by the A1, A2, and A3 atomizers were 23.281, 46.386, and 3.451 µm, respectively. The results showed that the lettuce plants treated with the A2 atomizers exhibited more significant effects on the growth, total polyphenol content, and antioxidant activity of the lettuce compared to those treated with the A1 and A3 atomizers. The results indicated that nutrient solution droplet size should be considered an essential factor when designing an aeroponic system. Keywords: Aeroponic, Antioxidant activity, Soilless, Spraying time, Total polyphenol content.
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Son, Byeong Ho, Seung Bok Choi, Quoc Hung Nguyen, Seung Min Hong, Soo Jin Lee, Yong Hun Lee, and Min Kyu Choi. "Design of Ultrasonic Vibrator for Conformal Coating Spray in LED Packaging." Advanced Materials Research 79-82 (August 2009): 715–18. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.715.

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This paper presents the design of ultrasonic vibrator utilizing a piezoelectric actuator. After describing a geometric configuration of the proposed atomizer, an analytical model of the ultrasonic atomizer is formulated by considering liquid film surface theory and wave theory. The dynamic analysis is then undertaken using a finite element analysis to determine principal longitudinal vibration modes. An optimization is performed by taking the amplitude of the tip displacement as an objective function. The fluid flow characteristics of the proposed atomizer is also analyzed under operating conditions through commercial software FLUENT.
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Dissertations / Theses on the topic "Ultrasonic atomiser"

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Shanmugam, Dinesh Kumar, and dshanmugam@swin edu au. "Development of ice particle production system for ice jet process." Swinburne University of Technology. Industrial Research Institute Swinburne, 2005. http://adt.lib.swin.edu.au./public/adt-VSWT20050805.145343.

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This thesis presents a comprehensive study of the ice particle production process through experimentation and numerical methods using computational fluid dynamics (CFD) that can be used to produce ice particles with controlled temperature and hardness for use in ice jet (IJ) process for industrial applications. The analytical and numerical modeling for the heat exchanger system are developed that could predict the heat, mass and momentum exchange between the cold gas and water droplets. Further, the feasibility study of the deployment of ice particles produced from the ice jet system for possible cleaning and blasting applications are analyzed numerically. Although the use of Abrasive Water Jet (AWJ) technology in cutting, cleaning, machining and surface processing is a very successful industrial process, a considerable amount of secondary particle waste and contamination impingement by abrasive materials has been an important issue in AWJ process. Some alternate cryogenic jet methods involving vanishing abrasive materials, such as plain liquid nitrogen or carbon dioxide have been tried for these applications, but they also suffer from certain drawbacks relating to the quality, safety, process control and materials handling. The use of ice jet process involving minute ice particles has received relatively little attention in industrial applications. Some researches have concentrated on the studies of effects of Ice Jet outlet parameters of the nozzle and focus tube for machining soft and brittle materials. Most of the work in this area is qualitative and researchers have paid a cursory attention to the ice particles temperature and the efficiency of production of these particles. An extensive investigation to gain insight knowledge into the formulation of ice formation process parameters is required in arriving at a deeper understanding of the entire ice jet process for production application. Experimental investigations were focussed on the measurement of ice particle temperature, phase transitions, ice particle diameter, coalescence and hardness test. The change in ice particle diameter from the inlet conditions to the exit point of the heat exchanger wasinvestigated using the experimental results. These observations were extended to numerical analysis of temperature variations of ice particles at different planes inside the custom built heat exchanger. The numerical predictions were carried out with the aid of visualization studies and temperature measurement results from experiments. The numerical models were further analysed to find out the behaviour of ice particles in the transportation stage, the mixing chamber of the nozzle and focus tube. This was done to find out whether the methodology used in this research is feasible and if it can be used in applications such as cleaning, blasting, drilling and perhaps cutting. The results of the empirical studies show that ice particles of desired temperature and hardness could be produced successfully with the current novel design of the heat exchanger. At the optimum parameters, ice particles could be produced below -60�C, with hardness of particles comparable to gypsum (Moh�s hardness of 1.5 to 3). The visualization studies of the process assisted in observation of the phases of ice at various points along the heat exchanger. The results of numerical analysis were found to agree well with the experiments and were supported by the statistical model assessments. Numerical analyses also show the survival of ice particles at the nozzle exit even with high-pressure, high-velocity water/air mixture.
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Meacham, John Marcus. "A Micromachined Ultrasonic Droplet Generator: Design, Fabrication, Visualization, and Modeling." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-07072006-103414/.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2007.
Mark Papania, MD, Committee Member ; Mark Allen, Committee Member ; Yves Berthelot, Committee Member ; Ari Glezer, Committee Member ; F. Levent Degertekin, Committee Chair ; Andrei G. Fedorov, Committee Chair.
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Phanphanit, Phattharawdee. "Experimental and computational study of an ultrasonic atomizer." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/experimental-and-computational-study-of-an-ultrasonic-atomizer(f4cb285b-c847-4b15-bd0c-64fa1bd142ce).html.

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A fountain type ultrasonic atomizer was chosen to be a possible device to be used to assist in the alleviation of global warming. Atomization of seawater by an ultrasonic atomizer will enhance more cloud condensation nuclei; as a result, more UV radiation will be reflected back into the space. There are two crucial spray characters: droplet size and the number of droplets. The droplet size needs to be in a certain size range, so that they can stay in the atmosphere. The number of droplets needs to be as high as possible; the more cloud nuclei, the more UV radiation is reflected. The characteristics of sprays are affected by many parameters: liquid properties and the atomizer design. In this study, we characterized two different atomizers: one with a fixed frequency atomizer at 1.72 MHz and one with adjustable frequency and voltage atomizer with a calculated resonant frequency of 2.24 MHz. In addition for the fixed atomizer, different liquid media: tap water (20° C), hot water (46° C), cold water (14° C) and salt waters with different percents salinity (2% - 3.5% by volume), were studied. A Phase Doppler Anemometer was used to measure the characteristics of sprays: droplet velocity, droplet size and number of droplets in a required size range. It was found that the droplet velocity is barely affected by the liquid properties and liquid depth except for the hot water. The relatively high temperature liquid appears to alter the characteristics of the piezo disk; in addition, the inconsistent temperature could vary the characteristics of the spray. The droplet size is strongly dependent on liquid properties and frequency of vibration. The number of droplets is obviously affected by liquid properties and atomizer designs; there is not yet a known correlation between the number of droplets and other parameters. A theoretical study was undertaken in order to compare predicted acoustic properties of acoustic waves with the measured number of droplets generated. The mathematical model was constructed based on applying boundary conditions to a general 2- Dimensional wave equation in cylindrical coordinates. The predicted results satisfy the boundary conditions very well. Since we deal with high frequency acoustic waves, the number of wave modes used in the prediction is significant. It is important to be ensure that all the cut-on wave modes are included otherwise the predicted results will not be very accurate. The more modes that are included, the more computer storage is required; therefore, the number of modes need to be enough to obtain accurate result but not too many to be over the limit of computer storage. The high number of modes used also decreases computer speed, increasing the running time. The mathematical model was used to predict acoustic properties. It was found that the predicted maximum acoustic pressure inside the central small region, where the disk is located, has the best correlation with the number of droplets for all liquid media and all operating conditions. The mathematical model can only predict which operating condition and atomizer design will provide the maximum acoustic pressure. As a result, we can optimize the fountain type ultrasonic atomizer in order to obtain the best result, suiting each application applied. If the geometry is changed, the model is also required to be re-written so that it will predict accurate results.
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Loney, Drew Allan. "Coupled electrical and acoustic modeling of viscous fluid ejectors." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54247.

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The focus of this dissertation is the development of a fundamental understanding of the acoustics and piezoelectric transducer governing the operation of piezoelectric inkjets and horn-based ultrasonic atomizers when utilizing high viscosity working fluids. This work creates coupled, electro-mechanical analytical models of the acoustic behavior of these devices by extending models from the literature which make minimal simplifications in the handling terms that account for viscous losses. Models are created for each component of the considered fluid ejectors: piezoelectric transducers, acoustic pipes, and acoustic horns. The acoustic pipe models consider the two limited cases when either the acoustic boundary layer or attenuation losses dominate the acoustic field and are adapted to account for changes in cross-sectional area present in acoustic horns. A full electro-mechanical analytical model of the fluid ejectors is formed by coupling the component models using appropriate boundary conditions. The developed electro-mechanical model is applied to understand the acoustic response of the fluid cavity alone and when combined with the transducer in horn-based ultrasonic atomizers. An understanding of the individual and combined acoustic response of the fluid cavity and piezoelectric transducer allow for an optimal geometry to be selected for the ejection of high viscosity working fluids. The maximum pressure gradient magnitude produced by the atomizer is compared to the pressure gradient threshold required for fluid ejection predicted by a hydrodynamic scaling analysis. The maximum working fluid viscosity of the standard horn-based ultrasonic atomizer and those with dual working fluid combinations, a low viscosity and a high viscosity working fluid to minimize viscous dissipation, is established to be on the order of 100mPas. The developed electro-mechanical model is also applied to understand the acoustic response of the fluid cavity and annular piezoelectric transducer in squeeze type ejectors with high viscosity working fluids. The maximum pressure gradient generated by the ejector is examined as a function of the principle geometric properties. The maximum pressure gradient magnitude produced by the ejector is again compared to the pressure gradient threshold derived from hydrodynamic scaling. The upper limit on working fluid viscosity is established as 100 mPas.
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Akafuah, Nelson Kudzo. "VISUALIZATION AND CHARACTERIZATION OF ULTRASONIC CAVITATING ATOMIZER AND OTHER AUTOMOTIVE PAINT SPRAYERS USING INFRARED THERMOGRAPHY." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/792.

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The disintegration of a liquid jet emerging from a nozzle has been under investigation for several decades. A direct consequence of the liquid jet disintegration process is droplet formation. The breakup of a liquid jet into discrete droplets can be brought about by the use of a diverse forcing mechanism. Cavitation has been thought to assist the atomization process. Previous experimental studies, however, have dealt with cavitation as a secondary phenomenon assisting the primary atomization mechanism. In this dissertation, the role of the energy created by the collapse of cavitation bubbles, together with the liquid pressure perturbation is explicitly configured as a principal mechanism for the disintegration of the liquid jet. A prototype of an atomizer that uses this concept as a primary atomization mechanism was developed and experimentally tested using water as working fluid. The atomizer fabrication process and the experimental characterization results are presented. The parameters tested include liquid injection pressure, ultrasonic horn tip frequency, and the liquid flow rate. The experimental results obtained demonstrate improvement in the atomization of water. To fully characterize the new atomizer, a novel infrared thermography-based technique for the characterization and visualization of liquid sprays was developed. The technique was tested on the new atomizer and two automotive paint applicators. The technique uses an infrared thermography-based measurement in which a uniformly heated background acts as a thermal radiation source, and an infrared camera as the receiver. The infrared energy emitted by the source in traveling through the spray is attenuated by the presence of the droplets. The infrared intensity is captured by the receiver showing the attenuation in the image as a result of the presence of the spray. The captured thermal image is used to study detailed macroscopic features of the spray flow field and the evolution of the droplets as they are transferred from the applicator to the target surface. In addition, the thermal image is post-processed using theoretical and empirical equations to extract information from which the liquid volume fraction and number density within the spray are estimated.
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Lessmann, Nils. "Numerical and experimental investigations of the disintegration of polymer melts in an ultrasonic standing wave atomizer." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974405027.

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Hikaník, Matúš. "Inkubátor s regulací teploty a vlhkosti." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219128.

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This project deals with comparing types and properties of commercial produced incubators for exotic birds. It searches the best solution from these area. In this project are compars individual components and their choice for realization in this project. Then in this project is solution of regulation temperature and humidity in engineered mechanism and discovered parameters of specifically space. Then is developed solution of thermostat and hydrosatat for this prototype. Temperature is changed by Peltier module, who is involved in correct system. Humidity is regulated by resistor humidifier. Complex system is managed by microcontroler. System communicates with PC via USB interface and Ethernet. Solution of this project is maked functional prototyp.
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Chen, Ming-Yong, and 陳明永. "Ultrasonic atomizer." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/86520565466273631519.

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碩士
國立雲林科技大學
電機工程系碩士班
100
In this paper the use of vibrator inverse piezoelectric effect, generate ultrasonic frequency range of electrical signals through electronic drive circuit to generate high frequency oscillation principle to promote the piezoelectric oscillator , resulting in their deformation behavior of ceramic materials, squeeze the liquid through the deformation, to current into mechanical vibrations of the ultrasonic wave frequency of vibration of liquid mist particles into very small , that the ultrasonic nebulizer. Production of this paper complete the following five parts of the internal circuit design : (A)the power circuit : 110V 60Hz step-down transformer to generate the required input by the three groups of power , DC24V for the oscillator circuit, fan use , DC 5V micro- controller IC for use. (B) ultrasonic oscillation circuit: the decision of high volatility, piezoelectric oscillator. (C) MCU control circuit: charge (1) control oscillator circuit of the power supply. (2) the strength of spray volume control. (3) low- level detection. (4) PWM three-color LED lights change color mixing. (5) the working state light control. (D) micro- controller IC: to HT4806A-1 as the main control circuit , writing assembly language. (E) the water level detection control circuit: the use of C1815 transistors water level probe to the 1K resistor connected to the MCU''s I / O, the voltage level of the High / Low in the low water level to determine whether state.
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Chen, Hong-Ting, and 陳泓廷. "Preparation of Chitosan Microparticles by Ultrasonic Atomizer." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/ag7xv8.

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碩士
國立臺北科技大學
生物科技研究所
97
Chitosan solutions were ultrasonic atomized; then dried by a heated column. The size and morphology of the dried chitosan particles were observed by a scanning electron microscope (SEM). Chitosan particles with narrow distributed diameter from about 0.2 through 3um can be prepared by the ultrasonic atomization under different composition of solution. It was found that the particle size increases with increasing of the concentration of chitosan in acetic solution. Furthermore, chitosan particles loaded with theophylline were prepared by a co-spray drying with the crosslinking agent.
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Lai, Chung-Wei, and 賴春維. "Performance of an Ultrasonic Atomizer with Hartman Resonator." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/39262452625676326229.

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碩士
國立成功大學
航空太空工程學系
89
An experimental study is conducted to investigate the atomization performance of an Ultrasonic Atomizer with Hartman resonator. The atomization mechanism of the liquid spray comes the energy of high frequency vibration in the resonator. A typical resonator is called “Hartman generator.” The experiments have a controlling device to control the mass flow rates of the liquid and the atomization gas. The flow field and the droplet size of the spray are measured with the image processing system and Insitec particle sizer. The observation of the flow field shows that the spray cone angles are less than 180 o when the atomizer is operated at appropriate liquid and air pressure. If the liquid pressure is less than the critical liquid pressure, the spray cone angles will be larger than 180 o , a condition called the unstable operation. The unstable operation happens when the reversal air momentum is not balanced by the mechanism of momentum of the incoming air and liquid flow. However, this unstable condition can be improved by increasing the liquid pressure. It is also found the liquid and gas flow rates are mainly determined by the diameters of liquid flow path and the outlet orifice of the atomizers, respectively. The air and liquid flow rates are also controlled by the air and liquid pressures. Results further show that the Sauter mean diameter of this typical spray is better than that from the conventional atomizer. For example, under Pw = 5kg/cm2 and Pa=6 kg/cm2, SMD varies from 10.57 μm to 14.36μm as the resonator size increases from 2.0mm to 3.0mm. Therefore we can see that the resonator plays a very effective role in the atomization. Results also show that the performance of the atomizer is essentially dependent on the air/liquid mass ratio and is approaching a limit when the air/liquid mass ratio is over 1.0. It implies that further atomization of the spray droplets becomes more difficult when they are small length. Hence the increase in atomization gas is less effective to produce smaller droplets. Moreover, the increase of atomization gas is limited by the choking condition of the gas flow at the nozzle outlet. Comparison of various air-assist atomizers indicates that the drop size distribution of internal mixing atomizers in this study, such as CK-5 and H-1 atomizers, is more uniform and the particle sizes are smaller than other atomizers. It is suggested that the atomization mechanism with internal mixing of liquid and gas inside the nozzle is more efficient than that with external mixing mechanism when air speed is less than speed of sound.
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Books on the topic "Ultrasonic atomiser"

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Berger, Harvey L. Ultrasonic liquid atomization: Theory and application. Hyde Park, NY: Partridge Hill Publishers, 1998.

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Book chapters on the topic "Ultrasonic atomiser"

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IIDA, Haruhisa, Sadayuki UEHA, and Minora KUROSAWA. "An Ultrasonic Atomizer using Squeeze Film." In Ultrasonics International 93, 679–82. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-7506-1877-9.50168-2.

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Conference papers on the topic "Ultrasonic atomiser"

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Lall, Pradeep, Kartik Goyal, Nakul Kothari, Ben Leever, and Scott Miller. "Effect of Process Parameters on Aerosol Jet Printing of Multi-Layer Circuitry." In ASME 2019 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ipack2019-6574.

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Abstract Printing technologies such as Aerosol Jet provides the freedom of miniaturizing interconnects and producing fine pitch components. Aerosol Jet, a direct printing technique replaces the traditional steps of manufacturing a printed circuit board such as lithography or etching, which are quite expensive, and further allowing the circuits to be fabricated onto all kinds of substrates. Wide impact areas range from healthcare to wearables to future automotive applications. The aerosol jet printer from Optomec utilized in this study, consists of two types of atomizers depending on ink viscosity. One is Ultrasonic Atomizer which supports ink with viscosity range of 1–5cP, and another is Pneumatic Atomizer with large range of suitable viscosity 1–1000cP. This paper focuses on utilizing the aerosol jet printing using both the atomizers to develop process parameters to be able to successfully print bi-material, multi-layer circuitry. The insulating material between two conductive lines used in the paper is of very high viscosity of 350cP, suitable for Pneumatic atomizer and Silver Nano-particle ink with the viscosity suitable for Ultrasonic atomizer as a conductive ink. A statistical modeling approach is presented to predict the attributes such as micro-via diameter before starting the print process, enabling us to pre-adjust the dimensions in CAD for the desired output. Process parameters to obtain a fine print with good electrical properties and better dimensional accuracy are developed. Importance of pre-cleaning the substrate is discussed, in addition to the printing process efficiency gauged as a function of process capability index and process capability ratio.
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Khmelev, Vladimir N., Andrey V. Shalunov, Maxim V. Khmelev, Anna V. Shalunova, and Dmitry V. Genne. "Ultrasonic atomizers of nanomaterials." In 2011 12th International Conference and Seminar of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM 2011). IEEE, 2011. http://dx.doi.org/10.1109/edm.2011.6006975.

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Zhang, Zhengguang, and Le-cai Cai. "Medical ultrasonic atomizer design parameters analysis." In 2010 3rd International Conference on Biomedical Engineering and Informatics (BMEI). IEEE, 2010. http://dx.doi.org/10.1109/bmei.2010.5639408.

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Akafuah, Nelson K., Abraham J. Salazar, Kozo Saito, and Vedanth Srinivasan. "Ultrasonically Driven Cavitating Atomizer: Prototype Fabrication and Characterization." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78024.

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A new device, ultrasonic cavitating atomizer (UCA), has been developed that uses ultrasonically driven cavitation to produce fine droplets. In the UCA the role of cavitation is explicitly configured to enhance the breakup of the liquid jet exiting the nozzle into fine droplets; the pressure modulation also assists the breakup process. The experimental study involves the fabrication of a prototype and the building of an experimental rig to test the prototype using water as the working fluid. The parameters tested include liquid injection pressure, horn tip frequency and liquid flow rate. The result shows improvement in the atomization of water with the application of ultrasonic cavitation.
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Sudong, Zhou, and Wang Jiahua. "Experimental Investigation on Atomization Characteristics of Ultrasonic Atomizer." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1990. http://dx.doi.org/10.4271/900803.

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Shen, Sheng Chih, and Yu-Jen Wang. "A Novel Handhold High Power MEMS Atomizer Using Micro Cymbal Shape Nozzle Plate for Inhalation Therapy." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86093.

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Inhalation therapy is being applied in the home care field to a gradually increasing degree, and therefore two issues of great importance are the convenience and portability of medical devices. Hence, this paper presents a novel highpower MEMS atomizer device that includes a ring-type piezoelectric actuator and a cymbal-shaped micro nozzle plate (CSNP). The latter can focus energy on the center of the nozzle plate and induce a large force, which provides the MEMS atomizer with the high power necessary to spray medical solutions of high viscosity and increase the atomization rate. The high-power MEMS atomizer can reduce liquids to droplets of an ultra-fine size distribution (Mass Median Aerodynamic Diameter, MMAD), increasing the nebulizing rate and enabling the spraying of high-viscosity fluids (cP>3.5). In this research, the ultra-fine droplets were of a MMAD of less than 4.07 μm at 127.89kHz and the atomization rate was 0.5ml/min. The drive voltage of this high-power MEMS atomizer device was only 3V, and the power consumption only one-tenth that of conventional ultrasonic atomizers at 1.2W. The simulation and experiments carried out in this study proved that the droplets are much smaller than those produced by current conventional devices and the device is of greater efficiency; therefore, the high-power MEMS atomizer is suitable for use in the development of a convenient and portable inhalation therapy device.
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Furuyama, Mikio, and Buoyan Xu. "Spray Characteristics of Methanol-Gasoline Blends Using Ultrasonic Atomizer." In International Fuels & Lubricants Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/922353.

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Lang, Yan-da, and Jian-hui Zhang. "Influence of piezoelectric atomizer pores on ultrasonic atomization effect." In 2014 Symposium on Piezoelectricity,Acoustic Waves, and Device Applications (SPAWDA). IEEE, 2014. http://dx.doi.org/10.1109/spawda.2014.6998582.

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Chou, Yuan-Fang, Kai-Jhong Chen, Jui-Mei Hsu, and Pei-En Chou. "An ultrasonic horn atomizer with closed loop driving circuit." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Steven F. Griffin. SPIE, 2016. http://dx.doi.org/10.1117/12.2219549.

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Dupuis, Eric D., Ayyoub M. Momen, Viral K. Patel, and Shima Shahab. "Ultrasonic Piezoelectric Atomizers: Electromechanical Modeling and Performance Testing." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-8262.

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Ultrasonic atomization of bulk liquids has received extensive attention in the past few decades due to the ability to produce controlled droplet sizes, a necessity for many industries such as spray coating and aerosol drug delivery. Despite the increase in attention, one novel application of this technology has been overlooked until recently, and that is the moisture removal capabilities of atomization. The first ever ultrasonic dryer, created by researchers at Oak Ridge National Lab in 2016, applies the mechanisms of atomization to mechanically remove moisture from clothing. The process utilizes the ultrasonic vibrations created by a piezoelectric transducer in direct contact with a wet fabric to rupture the liquid-vapor boundary of the retained water. Once ruptured, smaller droplets are ejected from the bulk liquid and are actively removed from the fabric pores. The mechanisms of droplet ejection from this event are related to both capillary waves forming on the liquid surface (Capillary Wave Theory), as well as the implosion of cavitation bubbles formed from the hydraulic shocks propagating from the transducer (Cavitation Theory). In this work, we present an analytical model for predicting the moisture removal rate of a wet fabric exposed to ultrasonic vibrations, and connect the atomization events to a global variable, acceleration, in order to decouple the relationship between the transducer and applied voltage. The acceleration governing atomization is predicted using a verified numerical model. The numerical model is shown to assist in developing ultrasonic drying by means of efficiently evaluating transducer design changes.
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