Areas of Use of Interacting Swirl Liquid and Gas Flows

Volshanik, V. V.; Orekhov, Genrikh

doi:10.22227/1997-0935.2015.7.87-104

Cited by 12 publications

(7 citation statements)

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“…Начало исследования контрвихревых течений было положено разработкой водосбросов высоко- напорных гидроузлов [1,2]. К настоящему времени контрвихревые течения, в которых в турбулентном диапазоне существенно интенсифицируются процессы массо-, энерго-и теплопереноса, применяют в технологиях, требующих получения высокодисперсных смесей или повышения эффективности теплообмена [3][4][5][6][7][8][9][10][11][12][13][14]. Такие течения наблюдаются также в конусах отсасывающих труб гидротурбин Френсиса при неноминальных режимах их работы [15,16].…”

Section: Introductionunclassified

Dynamics of laminar flows with coaxial oppositely-rotating layers

Zuikov

2019

Vestnik MGSU

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Introduction. The work relates to the scientific foundations of hydraulic and energy construction and is devoted to the study of laminar flows with coaxial oppositely-rotating layers. In the literature, such flows are called counter-vortex. In the turbulent range, counter-vortex flows are characterized by intensive mixing of the medium, which is widely used in the technologies of mixing non-natural and multi-phase media in thermal and atomic energy, in systems of mass- and heat transfer, in chemistry and microbiology, ecology, engine and rocket production. The aim of the theoretical study is to study the physical laws of the hydrodynamics of counter-vortex flows. Research methods. The theoretical Navier-Stokes equations and continuity equation are the basis of the theoretical model of the laminar counter-vortex flow. Results. Assuming the radial velocities are much less than the azimuthal and axial velocities and taking the Oseen approximation, the solution of the Navier - Stokes equations is obtained as Fourier - Bessel series or products of Fourier - Bessel series. In particular, the following were obtained: formulas for calculating the radial-longitudinal distributions of the normalized azimuthal, axial and radial velocities in the flow under study, the velocities are presented graphically in the form of radial profiles; equations for the calculation of current lines and viscous vortex fields, which are also presented in the form of graphs, were obtained. The two-layer and four-layer counter-vortex flows are considered. The analysis of the obtained theoretical results is performed. Conclusions. On the axis at the beginning of the active zone, the formation of a return flow with significant negative velocities is characteristic. This leads to the formation of a recirculation region, the mass exchange between which and the external flow is absent. Cascades of concentric vortexes of such high intensity that are not found in streams of a different nature are generated in the active zone. Calculation formulas include exp (-λ2x/Re) exponent multiplied by Reynolds number in degree b = 0 or b = -1, therefore increasing Reynolds number when b = 0 leads to proportional transfer of arbitrary characteristic counter-vortex flow down the pipe; and at b = -1, the bias of characteristic is accompanied by a proportional decrease in its scale.

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Section: Introductionunclassified

Dynamics of laminar flows with coaxial oppositely-rotating layers

Zuikov

2019

Vestnik MGSU

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“…2 it can be seen that the values of the radial velocities are one or two orders lower than the azimuthal and axial values. And the radial velocities will be the lower, the higher is the Reynolds number, which stands in the denominator of the obtained distribution (7). It can be said that the assumption made above on the basis of the previously obtained experimental data [6,8,10] that it is possible to neglect the radial component ur in the equations of the dynamics of a viscous fluid (but not in the continuity equation, since in this case the mass balance is violated) finds analytical confirmation.…”

Section: Distributions Of Flow Velocitiesmentioning

confidence: 96%

“…In the process of these studies in the Russian-language technical and normative literature, the term "contrvihrevoe techenie" ("counter-vortex flow") have formed 1 . Later, the range of application of such flows expanded [7], since the opposite rotation of interacting layers in the turbulent range allows one to obtain a number of effects, among which one should note the intensive mixing of the medium. This effect has a wide practical application in technologies including mixing of multiphase and heterogeneous media in microbiology, chemistry, ecology, heat, power and civil engineering, engine and rocket engineering.…”

Section: Introductionmentioning

confidence: 99%

Structure of laminar flows with oppositely-rotating coaxial layers

2018

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The article is devoted to the theoretical study of laminar flows with the coaxial layers rotating in opposite directions moving along the pipe. These flows have a wide practical application potential in technologies of mixing multiphase and heterogeneous media in microbiology, chemistry, ecology, heat engineering, power engineering, civil engineering and engine and rocket science. Such flows have a complicated three-dimensional structure. The theoretical model of the test flow is based on the Navier – Stokes's equations and Fourier – Bessel's method of expansion of differential equations. The article presents the formulas and graphs showing the radial-axial distributions of tangential, axial and radial flow velocities, stream functions and viscous vortex components. The authors made the theoretical analysis of the kinematic structure of such flows.

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“…In hydrotechnical construction, counter vortex flows are used in vortex spillways to quench the energy of high-speed water flows [4], in counter-vortex aerators [5,6] to create two-phase water-air flows. A detailed classification of devices using the interaction effect of oppositely swirling flows of liquid and gas is presented in [7].…”

Section: Introductionmentioning

confidence: 99%