Fine Structure of the Substance Distribution Pat-tern of a Free – Falling Drop on the Surface and in the Thickness of the Target Fluid in the Impact Mode of Merging


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High-speed video recording was used have been used to trace the evolution of the matter trans-fer pattern of a free-falling drop in a target fluid at rest in the impact mode of coalescence, when the kinetic energy (KE) of the drop exceeds its available potential surface energy (APSE). The combined use of transparent and colored fluids enables simultaneously traces the deformation of the free surface and the evolution of the matter transfer pattern in the thickness and on the surface of the target fluid. In the impact mode, a drop merging with a fluid at rest breaks up into individual fibers that form linear and mesh structures on the surface of the cav-ity and crown. Selected frames in lateral and frontal projections illustrate the main forms of a rapidly evolving pattern of matter distribution, composed of individual fibers. Given schemes of flow in intrusive and impact modes present the domains of rapid internal energy transforma-tion where the free surface of coalescing fluids is eliminated. The influence of energy trans-formation processes on the formation of the fine structure of flows, the main components of which, ligaments, are described by singular solutions of the system of fundamental equations, is discussed.

drop, cavity, crown, matter transfer, fibers, energy.

DOI: http://doi.org/10.33257/PhChGD.24.2.1043


Volume 24, issue 2, 2023 year


Тонкая структура картины распределения вещества свободно падающей капли на поверхности и в толще принимающей жидкости в импактном режиме слияния

Эволюция картины переноса вещества свободно падающей капли в покоящейся принимающей жид-кости в импактном режиме слияния, когда кинетическая энергия (КИ) капли превышает ее доступ-ную потенциальную поверхностную энергию (ДППЭ) изучена методами высокоскоростной видео-регистрации. Совместное применение прозрачных и окрашенных жидкостей позволяет одновременно прослеживать деформацию свободной поверхности и эволюцию картины переноса вещества в толще и на поверхности принимающей жидкости. В импактном режиме сливающаяся с покоящейся жидкостью капля распадается на отдельные волокна, образующие линейчатые и сетча-тые структуры на поверхности каверны и венца. Выборки из видеограмм в боковой и фронтальной проекциях иллюстрируют основные формы быстро эволюционирующей картины распределения вещества, составленной из отдельных волокон. Приводятся схемы течения в интрузивном и импакт-ном режимах, построенные с учетом локализации областей быстрой трансформации внутренней энергии при уничтожении свободной поверхности сливающихся жидкостей. Обсуждается влияние процессов трансформации энергии на формирование тонкой структуры течений, основные компо-ненты которой – лигаменты – описываются сингулярными решениями системы фундаментальных уравнений.

капля, каверна, венец, перенос вещества, волокна, энергия

DOI: http://doi.org/10.33257/PhChGD.24.2.1043


Volume 24, issue 2, 2023 year



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