Visualization of Liquids Flows in Microfluidics and Plasma Channels in Nanosecond Spark Microdischarges by Means of Digital Microscopy

Dekhtyar, Valeria A.; Дубинов, А. Е.

doi:10.26583/sv.15.1.01

2023

DOI: 10.26583/sv.15.1.01

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Visualization of Liquids Flows in Microfluidics and Plasma Channels in Nanosecond Spark Microdischarges by Means of Digital Microscopy

Valeria A. Dekhtyar¹,

А. Е. Дубинов

Abstract: An application of digital optical microscopes for visualization of single-pulse or pulsed-periodic processes in microfluidics and physics of spark microdischarges is studied. Multiple examples of coagulation processes of liquid microvolumes, nanosecond spark discharges near liquid drops and plant living tissues in a cell-size level are provided.

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Experimental detection of the multi-branch hysteresis of the droplet states sitting on a horizontal stretchable substrate

Dekhtyar

Дубинов

2023

Physics of Fluids

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In this paper, the states of liquid drops sitting on a horizontal elastic cyclically stretched and then weakened substrate were studied experimentally. A thin rubber band was used as a substrate, and glycerin was used as a liquid. A multi-branch hysteresis of the drop states was detected. The number of branches in the hysteresis can be adjusted by changing the time program for stretching–loosening the substrate tension.

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Experimental detection of the multi-branch hysteresis of the droplet states sitting on a horizontal stretchable substrate

Dekhtyar

Дубинов

2023

Physics of Fluids

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Custom-made tubular Tesla valves for laboratory lessons in classroom

Kolesov,

Dubinov

2024

Physics of Fluids

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The article proposes new, easy-to-manufacture multivariate tubular Tesla valves that can be used in the educational process at universities and colleges. Detailed instructions for making Tesla valves from available materials using simple tools are provided. The advantages of the proposed Tesla valves over the conventional ones, described in the literature, such as manufacture ease, availability of materials and accessories, mechanical flexibility, and the ability to quickly change the number of links and change the link connection pattern, are indicated. A simple method is proposed for conducting hydrodynamic studies of liquid flow from a vessel through Tesla valves, based on measuring the water level dynamics in the vessel and, in particular, measuring the vessel's complete emptying time. Some simple experiments to demonstrate the diodicity of the valves are carried out. The repeatability and measurement errors are assessed. Parallel and series connections of valve sections are studied. The prospects for Tesla valves' use in various fields of science and technology are considered. The advantages of the proposed valves for laboratory teaching experiments in the classroom are indicated.

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Формирование Выступа На Вершине Гидрогелевого Шарового Сегмента При Его Замерзании

Дехтярь,

Дубинов

2024

Вестник

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Известно, что при замерзании капли воды, сидящей на охлаждаемой горизонтальной плоской подложке, на вершине этой капли образуется острый конический выступ. В данной работе исследовался процесс замерзания предварительно насыщенных водой гидрогелевых шаровых сегментов, посаженных на горизонтальную охлаждающую плоскую поверхность. Поверхность охлаждалась с помощью элемента Пельтье. Впервые зарегистрировано образование острых конических выступов на вершинах гидрогелевых сегментов, аналогичных выступам, возникающих на замороженных каплях воды. Методом прямой видеовизуализации установлено, что в процессе замерзания гидрогелевых шаровых сегментов наблюдаются поднимающиеся вверх фронты затвердевания. Искривление этих фронтов и объемное расширение воды, содержавшейся в нанопорах гидрогеля, являются причиной появления выступов при их замерзании. Также установлено, что материал этих выступов после заморозки – лед. При этом следов полиакриламида в выступах обнаружено не было.

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Visualization of Liquids Flows in Microfluidics and Plasma Channels in Nanosecond Spark Microdischarges by Means of Digital Microscopy

Cited by 4 publications

References 0 publications

Experimental detection of the multi-branch hysteresis of the droplet states sitting on a horizontal stretchable substrate

Experimental detection of the multi-branch hysteresis of the droplet states sitting on a horizontal stretchable substrate

Custom-made tubular Tesla valves for laboratory lessons in classroom

Формирование Выступа На Вершине Гидрогелевого Шарового Сегмента При Его Замерзании

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