Dynamics of ultrasonic atomization of droplets

Deepu, P.; Peng, Chang; Moghaddam, Saeed

doi:10.1016/j.expthermflusci.2017.11.021

Cited by 59 publications

(19 citation statements)

References 26 publications

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“…The formation of atomized droplets should be steadfast and continuous. It is necessary to understand more about the dynamic behavior in ultrasonic atomization for real applications [13]. In this study, a software COMSOL Multiphysics ® 5.2 was referenced to understand the formation of atomized droplets by the Computational Fluid Dynamics method.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Onset of the Capillary Surface Wave in the Ultrasonic Atomizer

Song

Cheng²,

Reddy

et al. 2021

Micromachines

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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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Section: Introductionmentioning

confidence: 99%

Simulation of Onset of the Capillary Surface Wave in the Ultrasonic Atomizer

Song

Cheng²,

Reddy

et al. 2021

Micromachines

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“…Another technology that could be used for humidification purposes is ultrasonic atomization. It is used in many technological operations, including therapeutic nebulizers, surface coatings, and liquid fuel sprays [24]. For many years, ultrasonic atomization has been an area of interest, as spray consistency or fineness is an essential requirement.…”

Section: Introductionmentioning

confidence: 99%

A Novel Humidification Technique Used in Water Desalination Systems Based on the Humidification–Dehumidification Process: Experimentally and Theoretically

Tourab

Blanco-Marigorta

Elharidi

et al. 2020

Water

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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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“…Zhu et al [26] noted that a high-speed air flow was beneficial for improving pulsed fuel atomization performance, and numerical simulation results revealed that the penetration of a pulsed liquid jet and the width of a wake zone under high-speed air flow increased by 20% and 25%, respectively, resulting in an improvement of atomization and mixing performance. Deepu et al [27] experimentally investigated droplet behavior under the effect of ultrasonic vibration, and a theoretical model was established for investigating the atomization rate and droplet atomization lifetime. Kim et al [28] proposed a vibrating atomization model of polymer solutions, and they noted that the minimum droplet size was mainly determined by the Rayleigh acoustic pressure and liquid surface tension.…”

Section: Introductionmentioning

confidence: 99%

Influence of atomizing core on droplet dynamic behavior and machining characteristics under synergistically enhanced twin-fluid spray

Chen

Gao

et al. 2020

Int J Adv Manuf Technol

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The droplet dynamic behavior of spraying during the manufacturing process affects tool life, cooling, and lubrication. A detailed understanding of droplet dynamic behavior is required to improve the surface quality while reducing the cutting fluid consumption. In this study, quantitative measurements for droplet diameter, number concentration, and axial velocity were carried out through a phase Doppler particle analyzer technique. The droplet characteristic spatial distributions of a standard twin-fluid nozzle (STN) and a novel twin-fluid nozzle (NTN) under different gas-to-liquid mass ratio (GLR) values were analyzed in detail. The results showed that the high-speed internal gas flow of an atomizing core has a significant effect on improving the synergistically enhanced atomization behavior, and more smaller droplets and an increased droplet momentum are easily obtained. Furthermore, a better spatial distribution of atomization characteristics can be achieved under a higher GLR of 4.3%. Furthermore, the effects of the novel atomizing core structural parameters on the droplet mean velocity spatial distribution, droplet turbulence, and root mean square velocity fluctuation were investigated. The results also showed that the improved NTN can effectively improve the spray atomization performance and droplet dynamic characteristics. In addition, comparative studies of the effect of the atomizing core structure on the machining performance were performed. Compared with the STN, the improved NTN achieves a significant reduction in cutting temperature, tool wear, and surface roughness of 17.25%, 33.96%, and 37.83%, respectively, owing to the better droplet dynamic characteristics and spatial distribution of spray atomization characteristics.

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Dynamics of ultrasonic atomization of droplets

Cited by 59 publications

References 26 publications

Simulation of Onset of the Capillary Surface Wave in the Ultrasonic Atomizer

Simulation of Onset of the Capillary Surface Wave in the Ultrasonic Atomizer

A Novel Humidification Technique Used in Water Desalination Systems Based on the Humidification–Dehumidification Process: Experimentally and Theoretically

Influence of atomizing core on droplet dynamic behavior and machining characteristics under synergistically enhanced twin-fluid spray

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