The Afterglow of Electric Discharge

Strutt, Robert John

doi:10.1088/1478-7814/23/1/307

Cited by 18 publications

(16 citation statements)

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“…Não existem, de fato, muitos mecanismos físicos distintos para a produção de vorticidade/vórtices. Os primeiros resultados datam das décadas finais do século XIX, no contexto da teoria de fluidos ideais por Lord Kelvin, Helmholtz e Rayleigh (os trabalhos desteúltimo foram posteriormente aprofundados por Taylor) [39][40][41][42][43]. Estes autores mostraram que estruturas vorticais podem ser produzidas a partir de instabilidades dinâmicas, associadas, no escoamento, a regiões de cisalhamento (Kelvin-Helmholtz) ou a variações de densidade do fluido quando combinadas a gradientes de pressão (Rayleigh-Taylor).…”

Section: Instabilidadesunclassified

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A física estatística da turbulência

Moriconi

Pereira

2021

Rev. Bras. Ensino Fís.

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Realizamos um sobrevoo abrangente sobre a teoria estatística da turbulência, com a preocupação de embasá-la em noções importantes e consolidadas da dinâmica de fluidos, antes de nos aprofundarmos em discussões de modelos mais específicos, sujeitos a debates contemporâneos. A complexidade da turbulência traduz-se, na chamada abordagem estrutural, como o desafio de compreender, a partir da dinâmica de tubos de vorticidade, o transporte de energia das grandes para as pequenas escalas do escoamento, no limite singular de viscosidade nula. Propriedades estatísticas da cascata de energia, como o fenômeno da intermitência, são modeladas por meio de narrativas aparentemente diversas, associadas a processos estocásticos multiplicativos e, alternativamente, à formulação multifractal do espectro de singularidades do campo de velocidade turbulento. A síntese, fundamentação de primeiros princípios e integração dessas duas visões de modelagem à abordagem estrutural forma o corpo essencial das dificuldades teóricas atuais da turbulência.

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Section: Instabilidadesunclassified

“…queé a contrapartida de (41) no espaço físico (Cé uma outra constante universal). Ela expressa como a função de estrutura de ordem 2 escala com r, e mostra que S 2 (r)/r 2/3 deve ser universal na faixa inercial de um sistema turbulento.…”

Section: Kolmogorov E a Teoria K41unclassified

A física estatística da turbulência

Moriconi

Pereira

2021

Rev. Bras. Ensino Fís.

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“…In co‐flowing rupturing, liquid flows through an orifice and eventually breaks into droplets under different mechanisms. In dripping regime, the dispersed phase drips from the orifice, while in jetting regime, the liquid forms a thin stream due to the shearing force from the continuous phase and ruptures into uneven droplets with the action of Rayleigh instability . Utada et al designed a coaxial microchannel to detect the dripping to jetting transitions in co‐flowing liquid streams and demonstrated the existence of two distinct mechanisms.…”

Section: Monodispersed Single Emulsionsmentioning

confidence: 99%

Multiphase Microfluidics: Fundamentals, Fabrication, and Functions

Geng

Ling

Huang

et al. 2020

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microfluidic system with multiphase flow to intensify heterogeneous reactions, pre pare multiphase emulsions, and fabricate anisotropic functional materials.In a word, with its great advances in last several decades, multiphase flows in microfluidic system have shown numerous advantages, like fastening heat and mass transfer, reducing energy con sumption, improving productivity and purity, etc. Fortunately, because of the recent development and commercialization of micromachining technologies, microflu idic chips gradually moved from laboratory stage to practical application stage. There are also several comprehensive and accu rate Reviews that summarize the research on structural design, [9] system regulation, [10] and applications [11] of microfluidic technology. However, fewer articles focused on the latest technologies and achievements in the field of the multiphase flow control and its applications. In this Review, we aim to give a preliminary guidance for researchers with dif ferent backgrounds on the formation mechanisms, fabrication methods, and potential applications of multiphase microfluidics within different systems. We firstly presented the evolution of microfluidic device manufacture, followed by the mechanism and regulation methods of multiphase flow in microfluidic devices. Then the application of both single and double multi phase emulsions in industrial process optimization and new material preparation were described in details. By comparing the mechanism of manufacturing single droplets, microbub bles, liquid-liquid-liquid emulsions, and gas-liquid-liquid emulsions from various perspectives, researchers could obtain their first glance in the overall field of multiphase microfluidics and choose the system of manufacturing particles or materials with specific function that is most suitable for their application. At the end, we also introduced some lastly emerging tech nologies, such as microelectromechanical systems (MEMS) and machine deep learning, combined with microfluidic tech nology, illustrating the huge potential for diverse applications of the latter. Development of Microfluidic DevicesThe recent progress in micromachining has broadened the selec tion of manufacturing technologies and materials for researchers and engineers to design complex and delicate microstructure that generates and manipulates multiphase flow. Generally, the most common fabrication methods of microfluidic devices can be Multiphase microfluidics enables an alternative approach with many possibilities in studying, analyzing, and manufacturing functional materials due to its numerous benefits over macroscale methods, such as its ultimate controllability, stability, heat and mass transfer capacity, etc. In addition to its immense potential in biomedical applications, multiphase microfluidics also offers new opportunities in various industrial practices including extraction, catalysis loading, and fabrication of ultralight materials. Herein, aiming to give preliminary guidance for researchers from different backgrounds, ...

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“…Strutt [17,18] In 1924, the atomic fluorescence of metal atoms in flames was observed for the first time by Nichols and Howes [25], who reported the atomic fluorescence of calcium, strontium, barium, lithium, and sodium in a Bunsen flame. In 1927, Badger [26] published an excellent paper on the atomic fluorescence of thallium, mercury, magnesium, copper, silver, cadmium, and sodium in a Bunsen flame.…”

Section: A Atomic Fluorescence Of Metal Vapors In Quartz Containersmentioning

confidence: 99%