Stabilization of liquid instabilities with ionized gas jets

Park, Sanghoo; Choe, Wonho; Lee, Hyungyu; Park, Joo Young; Kim, Jinwoo; Moon, Se Youn; Cvelbar, Uroš

doi:10.1038/s41586-021-03359-9

Cited by 51 publications

(36 citation statements)

References 29 publications

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“…Струя действовала на поверхность жидкость под углом α = 20 • . Для математического описания перемещения углубления по поверхности жидкости целесообразно использовать уравнение баланса сил на поверхности раздела фаз и известные формулы для движения газового пузырька в жидкости [10,29,32,33]. На воображаемый газовый пузырек 2 действуют следующие силы (рис.…”

Section: теоретический анализunclassified

“…Струя, действующая на поверхность расплава металла, играет ключевую роль в химических превращениях и перемешивании взаимодействующих веществ. Взаимодействие плазменных струй атмосферного давления с техническими и биологическими жидкостями применяется для изучения свойств холодной плазмы [7][8][9][10][11]. В оптике форма углубления, образованного газовой струей на поверхности жидкости, используется в качестве шаблона для изготовления асферических зеркал [12].…”

Section: Introductionunclassified

“…Наклонное воздействие газовой струи на поверхность вязкой жидкости позволяет генерировать стабильные релаксационные колебания [21]. На поверхности невязкой жидкости (Re > 100) колебания носят хаотический характер [2,5,6,10,18,22]. Частота колебаний на поверхности вязкой жидкости в значительной степени определяется вязкостью, и такая зависимость может быть положена в основу бесконтактного метода измерений этой величины.…”

Section: Introductionunclassified

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Исследование Реакции Поверхности Жидкости На Импульсное Воздействие Наклонной Газовой Струи При Малых Числах Рэйнольдса

Савенков¹,

Сычёв²

2022

Журнал Технической Физики

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A mathematical description of the motion of a cavity on the liquid surface under an oblique action of a gas jet is obtained using the well-known expressions for the movement of a gas bubble in a liquid. The boundary of the viscous drag force domination over the form drag force is determined. The impingement of the gas jet on the liquid surface is considered as a dynamic object of the automatic control theory. It is found that the dynamic properties of the two-phase system "gas jet - liquid" are described by the integrator equations. Using a specially designed setup, the transient response of the "gas jet - liquid" system were experimentally obtained for the aerodynamic action at angles of 20º and 50º to the surfaces of liquids with the viscosities of 0.71 and 26.1 Pa•s (Reynolds number Re < 2). The research results are necessary for the analysis of the non-contact aerodynamic method of liquid viscosity measurements.

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Section: теоретический анализunclassified

Section: Introductionunclassified

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Исследование Реакции Поверхности Жидкости На Импульсное Воздействие Наклонной Газовой Струи При Малых Числах Рэйнольдса

Савенков¹,

Сычёв²

2022

Журнал Технической Физики

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“…Due to its complex electrical and thermal action, atmospheric plasma shows a possible way how to locally and in a scalable way change the local physicochemical properties of the contacting liquid or to manipulate its flow via altered wettability of close surfaces. The plasma can even stabilize an otherwise unstable liquid interface 18 . For such utilization of the microplasma a local, microscopic understanding of the dynamics at plasma–liquid interface is necessary.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of microflow at the plasma–liquid interface

Kuthanová

Hoder

2022

Sci Rep

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We study the interaction of microplasma with viscous liquid in a narrow gap. The reduced surface tension and viscosity of the liquid droplet from local plasma-heating induce a radial fingering. The introduced methodology enables spatially and temporally resolved quantification of dissipated power density and of resulting velocity of the advancing plasma–liquid interface. For two plasma power scenarios, we demonstrate how the irregular distribution of the two parameters leads to microflow, interface stretching, and to primary droplet fragmentation via capillary instability and end pinching.

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“…It was reported that an ion flux can influence the nonlinear Raman light emission because extra electrons were transferred from negatively ionized air molecules to the sample surface . As a kind of ion flux, ionic wind (IW) is a flow of cold plasma composed of mobile charged and neutral gas molecules as well as electrons. , It has been applied in the fields of thermal engineering and satellite propulsion and can be generated by polarized needle-net (Figure a) or needle-plate electrodes. − The charged ion particles in IW can be delivered and transferred to targeted samples over a distance of several millimeters, so that it can be regarded as a remote and tunable ionization source for CT. Herein, for the first time, we propose a method of ionic-wind-enhanced Raman spectroscopy (IWERS) incorporated with PB to perform substrate-free Raman measurements of several fragile samples by means of CT at a macroscopic distance. We aim at proving whether IWERS is capable of enhancing Raman peaks and suppressing fluorescence simultaneously in the noncontact mode when the samples are positioned behind the net.…”

Section: Introductionmentioning

confidence: 99%

Ionic-Wind-Enhanced Raman Spectroscopy without Enhancement Substrates

et al. 2022

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Raman spectra are often masked by strong fluorescence, which severely hinders the applications of Raman spectroscopy. Herein, for the first time, we report ionic-wind-enhanced Raman spectroscopy (IWERS) incorporated with photobleaching (PB) as a noninvasive approach to detect fluorescent and vulnerable samples without a substrate. In this study, ionic wind (IW) generated by needle-net electrodes transfers charges to the sample surface in air on the scale of millimeters rather than nanometers in surface-enhanced Raman spectroscopy. Density functional theory calculations reveal that the ionic particles in IW increase the susceptibility of the sample molecules, thus enhancing the Raman signals. Meanwhile, the incorporation of IW with PB yields a synergistic effect to quench fluorescence. Therefore, this approach can improve the signal-to-noise ratio of Raman peaks up to three times higher than that with only PB. At the same time, IWERS can avoid sample pollution and destruction without substrates as well as high laser power. For archeological samples and a red rock as an analogue to Mars geological samples, IWERS successfully identified weak but key Raman peaks, which were masked by strong florescence. It suggests that IWERS is a promising tool for characterizations in the fields of archeology, planetary science, biomedicine, and soft matter.

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Stabilization of liquid instabilities with ionized gas jets

Cited by 51 publications

References 29 publications

Исследование Реакции Поверхности Жидкости На Импульсное Воздействие Наклонной Газовой Струи При Малых Числах Рэйнольдса

Исследование Реакции Поверхности Жидкости На Импульсное Воздействие Наклонной Газовой Струи При Малых Числах Рэйнольдса

Dynamics of microflow at the plasma–liquid interface

Ionic-Wind-Enhanced Raman Spectroscopy without Enhancement Substrates

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