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Zharkov YE, Zhorzholiani ST, Sergeev AA, Agafonov AV, Gorodkov AY, Bockeria LA. Experimental and Model Study of a Swirling Fluid Flow in a Converging Channel As a Simulation of Blood Flow in the Heart and Aorta. DOKL BIOCHEM BIOPHYS 2023; 513:S36-S52. [PMID: 38472664 DOI: 10.1134/s1607672924700777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 01/15/2024] [Accepted: 01/17/2024] [Indexed: 03/14/2024]
Abstract
Study of swirling flows in channels corresponding to the static approximation of flow channels of the heart and major vessels with a longitudinal-radial profile zR2 = const and a concave streamlined surface at the beginning of the longitudinal coordinate has been carried out. A comparative analysis of the flow structure in channel configurations zRN = const, where N = -1, 1, 2, 3, in the absence and presence of a concave surface was carried out. The numerical modeling was compared with the results of hydrodynamic experiments on the flow characteristics and the shape of the flow lines. The numerical model was used to determine the velocity structure, viscous friction losses, and shear stresses. Numerical modeling of steady-state flows for channels without a concave surface showed that in the channel zR2 = const there is a stable vortex flow structure with the lowest viscous friction losses. The presence of a concave surface of sufficient size significantly reduces viscous friction losses and shear stresses in both the steady state and pulsed modes.
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Affiliation(s)
- Y E Zharkov
- Bakulev National Medical Research Center for Cardiovascular Surgery, Moscow, Russia
| | - S T Zhorzholiani
- Bakulev National Medical Research Center for Cardiovascular Surgery, Moscow, Russia
| | - A A Sergeev
- Bakulev National Medical Research Center for Cardiovascular Surgery, Moscow, Russia
| | - A V Agafonov
- Bakulev National Medical Research Center for Cardiovascular Surgery, Moscow, Russia
| | - A Y Gorodkov
- Bakulev National Medical Research Center for Cardiovascular Surgery, Moscow, Russia.
| | - L A Bockeria
- Bakulev National Medical Research Center for Cardiovascular Surgery, Moscow, Russia
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Naumov IV, Gevorgiz RG, Skripkin SG, Tintulova MV, Tsoi MA, Sharifullin BR. Experimental study of the topological flow transformations in an aerial vortex bioreactor with a floating washer. Biotechnol J 2023; 18:e2200644. [PMID: 37164941 DOI: 10.1002/biot.202200644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 04/18/2023] [Accepted: 05/03/2023] [Indexed: 05/12/2023]
Abstract
BACKGROUND Research into the flow structure in an aerial vortex bioreactor is relevant for developing the methods for growing cell cultures. Determining the optimal cultivation condition for a certain process is especially important in the case when such parameters of the medium as density and viscosity significantly change with the culture growth in the bioreactor. METHODS AND RESULTS The research of the flow dynamic was carried out in an 8.5 L universal aerial vortex bioreactor, with a washer freely floating on its surface and stabilizing the motion of the working fluid. The regularities of the vortex motion of the culture medium have been determined by Particle Image Velocimetry depending on its volume and the intensity of rotation of the activator, generating vortex motion in the air. CONCLUSION The observed vortex structure and its dynamics at increasing flow swirl intensity are established to coincide with the structure of a confined vortex flow in a cylindrical container with no washer for both single and two-fluid configurations. This novel methodology of the flow optimization shows that an ascending swirling jet forms in the vicinity of the bioreactor axis, and a bubble-like vortex breakdown forms in the axial region.
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Affiliation(s)
- Igor V Naumov
- Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russian Federation
- Novosibirsk State University, Novosibirsk, Russian Federation
| | - Ruslan G Gevorgiz
- Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russian Federation
- Kovalevsky Institute of Biology of the Southern Seas RAS, Moscow, Russian Federation
| | - Sergey G Skripkin
- Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russian Federation
- Novosibirsk State University, Novosibirsk, Russian Federation
| | - Maria V Tintulova
- Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russian Federation
- Novosibirsk State University, Novosibirsk, Russian Federation
| | - Mikhail A Tsoi
- Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russian Federation
| | - Bulat R Sharifullin
- Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russian Federation
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Guido R, Rinderknecht F, Cabeza C, Martí AC, Sarasúa G. Development and decay of vortex flows in viscoelastic fluids between concentric cylinders. J Phys Condens Matter 2022; 34:154003. [PMID: 35051920 DOI: 10.1088/1361-648x/ac4d5c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
We study the development and decay of vortex in viscoelastic fluids between coaxial cylinders by means of experiments with solutions of polyacrylamide and glycerin and numerical simulations. The transient process is triggered when the inner cylinder is either abruptly started or stopped while the outer is kept fixed. The azimuthal velocity, obtained by means of digital particle velocimetry, exhibits oscillations before reaching the stationary state. The development of the vortex is characterized by means of the overshoot, i.e. the difference between the maximum and the stationary velocity. Analogously, in the decay of the vortex, the azimuthal velocity changes its direction and the relevant parameter is the undershoot defined as the maximum reversed transient velocity. To get a deeper insight into this phenomenon, the experimental results are supplemented with numerical simulations of rheological models as the Oldroyd-B and White-Metzer. The results obtained with the first model reveal the dependence of the overshoot and undershoot with the elasticity number of the fluid. Using the White-Metzer model we explain the increase of the overshoot produced by the reduction of the solvent viscosity in terms of the shear-thinning effects.
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Affiliation(s)
- Renzo Guido
- Iguá 4225, Instituto de Física, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Felipe Rinderknecht
- Iguá 4225, Instituto de Física, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Cecilia Cabeza
- Iguá 4225, Instituto de Física, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Arturo C Martí
- Iguá 4225, Instituto de Física, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Gustavo Sarasúa
- Iguá 4225, Instituto de Física, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
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Jardin T, Colonius T. On the lift-optimal aspect ratio of a revolving wing at low Reynolds number. J R Soc Interface 2019; 15:rsif.2017.0933. [PMID: 29925578 DOI: 10.1098/rsif.2017.0933] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Accepted: 05/23/2018] [Indexed: 11/12/2022] Open
Abstract
Lentink & Dickinson (2009 J. Exp. Biol.212, 2705-2719. (doi:10.1242/jeb.022269)) showed that rotational acceleration stabilized the leading-edge vortex on revolving, low aspect ratio (AR) wings and hypothesized that a Rossby number of around 3, which is achieved during each half-stroke for a variety of hovering insects, seeds and birds, represents a convergent high-lift solution across a range of scales in nature. Subsequent work has verified that, in particular, the Coriolis acceleration plays a key role in LEV stabilization. Implicit in these results is that there exists an optimal AR for wings revolving about their root, because it is otherwise unclear why, apart from possible morphological reasons, the convergent solution would not occur for an even lower Rossby number. We perform direct numerical simulations of the flow past revolving wings where we vary the AR and Rossby numbers independently by displacing the wing root from the axis of rotation. We show that the optimal lift coefficient represents a compromise between competing trends with competing time scales where the coefficient of lift increases monotonically with AR, holding Rossby number constant, but decreases monotonically with Rossby number, when holding AR constant. For wings revolving about their root, this favours wings of AR between 3 and 4.
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Affiliation(s)
- T Jardin
- Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-Supaero), Université de Toulouse, 31055 Toulouse Cedex 4, France .,Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125, USA
| | - T Colonius
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125, USA
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Lee T, Sobolev YI, Cybulski O, Grzybowski BA. Dynamic Assembly of Small Parts in Vortex-Vortex Traps Established within a Rotating Fluid. Adv Mater 2019; 31:e1902298. [PMID: 31259450 DOI: 10.1002/adma.201902298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/01/2019] [Indexed: 06/09/2023]
Abstract
Stable, purely fluidic particle traps established by vortex flows induced within a rotating fluid are described. The traps can manipulate various types of small parts, dynamically assembling them into high-symmetry clusters, cages, interlocked architectures, jammed colloidal monoliths, or colloidal formations on gas bubbles. The strength and the shape of the trapping region can be controlled by the strengths of one or both vortices and/or by the system's global angular velocity. The system exhibits a range of interesting dynamical behaviors including a Hopf-bifurcation transition between equilibrium-point trapping and the so-called limit cycle in which the particles are confined to circular orbits. Theoretical considerations indicate that these vortex-vortex traps can be further miniaturized to manipulate objects with sizes down to ≈10 µm.
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Affiliation(s)
- Taehoon Lee
- IBS Center for Soft and Living Matter, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, 689-798, Republic of Korea
- Department of Chemistry, UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, 689-798, Republic of Korea
| | - Yaroslav I Sobolev
- IBS Center for Soft and Living Matter, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, 689-798, Republic of Korea
| | - Olgierd Cybulski
- IBS Center for Soft and Living Matter, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, 689-798, Republic of Korea
| | - Bartosz A Grzybowski
- IBS Center for Soft and Living Matter, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, 689-798, Republic of Korea
- Department of Chemistry, UNIST, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan, 689-798, Republic of Korea
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