Fluid Dynamics最新文献_第10页

Submerging and Floating-up Vortices in the Picture of Smooth Inflow of a Free-Falling Ethanol Drop into Water 自由落体乙醇滴入水中平稳流入图像中的下沉和浮起涡

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824603772

Yu. D. Chashechkin, A. Yu. Il’inykh

{"title":"Submerging and Floating-up Vortices in the Picture of Smooth Inflow of a Free-Falling Ethanol Drop into Water","authors":"Yu. D. Chashechkin, A. Yu. Il’inykh","doi":"10.1134/S0015462824603772","DOIUrl":"10.1134/S0015462824603772","url":null,"abstract":"The comparative videorecording of the coalescence pictures of free falling drops of 0.01% water solution of potassium permanganate and 95% ethanol solution of smaller density is performed. The kinetic energy of both fluids is smaller than the potential surface energy. The drop of the solution, whose density is greater than that of the target fluid, flows smoothly into the fluid thickness, while a cavity is formed with retardation. The submerging intrusion transforms into an annular vortex, which is pushed by a growing cavity. The ethanol drop also flows into the fluid thickness but forms a floating-up intrusion, which distorts the shape of the target cavity. When the conical cavity stops to sharpen and attains a maximum depth, a small vortex, which contains the light fluid, is thrown into the fluid thickness. The dimensions of the vortex forming the secondary intrusion remain almost the same during the motion. The light vortex stops gradually and forms the secondary intrusion. The central region of the secondary intrusion floats up and transforms into a vortex ring. The dimensions of the buoyancy-driven floating-up vortex increase with time. The time dependences of the dimensions of the basic structural components are presented.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 6","pages":"1789 - 1808"},"PeriodicalIF":1.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Energy Balance of Puffing and Microexplosion of Two-Liquid Droplets 双液滴膨化与微爆炸的能量平衡

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824604613

D. V. Antonov, R. M. Fedorenko, D. N. Kovalev, P. A. Strizhak

引用次数: 0

An Exact Solution for a Time-Dependent System of Radiative-Conductive Heat Transfer Equations 一个随时间变化的辐射传导传热方程组的精确解

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824604297

V. V. Zaviyalov

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Exact Solution of the Problem of Vapor Flow in a Gap between an Evaporating Droplet of Liquid and a Hot Wall 蒸发液滴与热壁间隙中蒸汽流动问题的精确解

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824603747

A. V. Palagin

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Evolution of Pressure Waves in Liquid Containing a Porous Partition Saturated with a Bubble Fluid 含气泡流体饱和多孔隔板液体中压力波的演化

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824603735

I. K. Gimaltdinov, A. S. Rodionov, O. Yu. Valiakhmetova

引用次数: 0

The Laws of the Matter Distribution in a Colored Free-Falling Drop in a Transparent Target Fluid (Review) 透明靶流体中有色自由落体的物质分布规律（综述）

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824604315

Yu. D. Chashechkin

{"title":"The Laws of the Matter Distribution in a Colored Free-Falling Drop in a Transparent Target Fluid (Review)","authors":"Yu. D. Chashechkin","doi":"10.1134/S0015462824604315","DOIUrl":"10.1134/S0015462824604315","url":null,"abstract":"The results of the visualization of the matter transfer processes in colored free-fall drops, which mix with a transparent target fluid are analyzed. The parametrization is carried out basing on the system of fundamental equations of fluid mechanics which includes the equations of state for the density and the Gibbs potential. The contribution of different mechanisms of energy transfer is discussed; these are the macroscopic (including flows, waves, and vortices) and microscopic (dissipative and conversional) ones. The radiation transfer effect is not considered. The technique of the present-day experiments is descried, which allows to record accompanying acoustic signals together with the highly-resolving videorecording of colored flow pictures. The flow structure, dynamics, and energetics are analyzed for different density ratios of the confluent fluids and the kinetic and potential surface energies (PSE) of the drop. The conditions of the establishment of certain selected regimes, such as intrusive drop inflow, impact breakdown in fibers, and an intermediate hovering and rebound regime, are determined. A drop flowing smoothly into the fluid thickness at a small contact velocity in the intrusive regime forms a connected body. Thin trickles containing the matter of both media are formed in the contact spot in the impact mode. The fibrous wakes of the trickles form lineate and reticular structures on the fluid surface and within its thickness. In the intermediate regime the drop can hover on the fluid surface, touch it, merge partially with it, and rebound with the loss of the matter. The evolution of gas cavities and bubbles radiating acoustic packets is traced. The necessity of taking account for all the mechanisms of total energy transfer in describing hydrodynamics and acoustics of drop flows is noted.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 6","pages":"1693 - 1734"},"PeriodicalIF":1.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Sufficient Energy Estimates of Stability of Unsteady Combined Shear Flows in a Cylindrical Layer 圆柱层非定常组合剪切流稳定性的充分能量估计

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824605278

D. V. Georgievskii

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Numerical Study of Interplay between Double-diffusive Convection and Interfacial Phenomena in Vertical Bridgman Crystal Growth of CdZnTe CdZnTe垂直桥曼晶体生长中双扩散对流与界面现象相互作用的数值研究

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824603553

A. O. Gusev, I. A. Denisov, O. S. Mazhorova

引用次数: 0

Electrodynamic Mechanism of Expansion of Two-Component Plasma in a Spherically Symmetric Vacuum Gap 球对称真空间隙中双组分等离子体膨胀的电动力学机制

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S0015462824604601

A. O. Kokovin, V. Yu. Kozhevnikov, A. V. Kozyrev, N. S. Semenyuk

引用次数: 0

Axisymmetric Poiseuille Flow with Temperature-Dependent Viscosity under Pressure and Temperature Gradients 压力和温度梯度下粘度随温度变化的轴对称泊泽维尔流

IF 1 4区工程技术

Fluid Dynamics Pub Date : 2025-01-10 DOI: 10.1134/S001546282460367X

D. V. Knyazev

{"title":"Axisymmetric Poiseuille Flow with Temperature-Dependent Viscosity under Pressure and Temperature Gradients","authors":"D. V. Knyazev","doi":"10.1134/S001546282460367X","DOIUrl":"10.1134/S001546282460367X","url":null,"abstract":"The study of steady-state axisymmetric Poiseuille flow of a Newtonian fluid induced by streamwise pressure and temperature gradients in the case of the dynamic viscosity coefficient dependent on the temperature is reduced to finding solutions to a three-parameter boundary-value problem for a third-order ordinary differential equation. In the domain of the parameter space corresponding to negative axial temperature gradients, there exist two branches of solutions describing flows accompanied by heat removal from the fluid. When the branches meet, they form a boundary in the phase space beyond which no solutions to the Poiseuille-type problem exist. One of the branches can be continued into the domain of non-negative values of the streamwise temperature gradient and contains an isothermal Poiseuille solution. Along this branch, curve of the flow rate as a function of the dimensionless axial temperature gradient has a minimum in the domain of positive values of the latter. In this part of the parameter space, the heat exchange regime with the external medium depends on the relation between all three dimensionless numbers of the problem. The heat exchange regime affects the nature of flow, slowing down the flow near the rigid wall during heat transfer, and forming a more filled velocity profile when heat is absorbed by fluid.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"59 6","pages":"1741 - 1750"},"PeriodicalIF":1.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S001546282460367X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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