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Journal articles on the topic 'Vortex chamber'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 May 2022

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1

Singh, Ravi Kant, Achintya Kumar Pramanick, and Subhas Chandra Rana. "Numerical study of a double inlet chamber counter flow vortex tube with insulation." IOP Conference Series: Earth and Environmental Science 850, no. 1 (November 1, 2021): 012024. http://dx.doi.org/10.1088/1755-1315/850/1/012024.

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Abstract The present study intends to improve the performance of the Ranque-Hilsch counter flow vortex tube, analysed using computational fluid dynamics. In the axisymmetric 3-D, steady-state, compressible, and turbulent flow vortex tube, the air has been used as the working fluid. The ANSYS17.1 FLUENT software has been used with the standard º-ε turbulent model for different mass fraction of cold fluid and inlet pressure in the numerical simulation and validated with the experimental results. It is observed from the study that as the inlet chambers number increases from 1 to 2, there is a decrease of 7.8 % in the cold exit temperature of the vortex tube. However, insulating the double chamber vortex tube leads to a further reduction of 4.2% in the cold exit temperature. Therefore, it indicates that the overall decline in the cold exit temperature from one chamber non-insulated vortex tube to double chamber insulated vortex tube is 9.6%. In terms of cold exit temperature, it can be concluded that using a double inlet chamber vortex tube with insulation yields the optimum results.

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2

Jawarneh, Ali M., P. Sakaris, and Georgios H. Vatistas. "Experimental and Analytical Study of the Pressure Drop Across a Double-Outlet Vortex Chamber." Journal of Fluids Engineering 129, no. 1 (June 8, 2006): 100–105. http://dx.doi.org/10.1115/1.2375131.

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This paper presents experimental and analytical results concerning the pressure drop and the core size in vortex chambers. The new formulation is based on the conservation of mass and energy integral equations and takes into account the presence of two outlet ports. The diminishing vortex strength is introduced through the vortex decay factor. The influence of vortex chamber geometry, such as diameter ratio, aspect ratio, and Reynolds number, on the flow field have been examined and compared with the present experimental data. It is shown that the presence of the swirl velocity component makes the pressure drop across a vortex chamber significantly different than the familiar unidirectional pipe flow. When the chamber length is increased, the vortex diminishes under the action of friction, producing a weaker centrifugal force which leads to a further pressure drop. It is revealed that by increasing the Reynolds number, the cores expand resulting into a larger pressure coefficient. For a double-outlet chamber where the flow is divided into two streams, the last parameter is found to be less than that of a single-outlet.

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3

Wei, Xianggeng, Jiang Li, and Guoqiang He. "Influence of Structural Parameters on the Performance of Vortex Valve Variable-Thrust Solid Rocket Motor." International Journal of Turbo & Jet-Engines 34, no. 1 (January 1, 2017): 1–9. http://dx.doi.org/10.1515/tjj-2015-0047.

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AbstractThe vortex valve solid variable thrust motor is a new solid motor which can achieve Vehicle system trajectory optimization and motor energy management. Numerical calculation was performed to investigate the influence of vortex chamber diameter, vortex chamber shape, and vortex chamber height of the vortex valve solid variable thrust motor on modulation performance. The test results verified that the calculation results are consistent with laboratory results with a maximum error of 9.5%. The research drew the following major conclusions: the optimal modulation performance was achieved in a cylindrical vortex chamber, increasing the vortex chamber diameter improved the modulation performance of the vortex valve solid variable thrust motor, optimal modulation performance could be achieved when the height of the vortex chamber is half of the vortex chamber outlet diameter, and the hot gas control flow could result in an enhancement of modulation performance. The results can provide the basis for establishing the design method of the vortex valve solid variable thrust motor.

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4

Baz, A., and J. Gilheany. "Vortex Tube-Assisted Environmental Control of Hyperbaric Chambers." Journal of Energy Resources Technology 110, no. 4 (December 1, 1988): 230–36. http://dx.doi.org/10.1115/1.3231387.

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Model predictions of time histories of the temperature and humidity ratio within a hyperbaric chamber under conditions of compression and decompression are presented with and without vortex tube-assisted environmental control. The effects of ventilation and ascent and descent rates on the environment within the chamber and the power required by the environmental control system, with and without vortex tube assist, are also presented. Results demonstrate that the vortex tube assist system is an effective means of more precisely controlling the environment within hyperbaric chambers with substantial savings in power. The model used incorporates a complete description of the pyschrometric properties of the humid gas mixture within the chamber, plus the sensible and latent heat loads produced by the occupants and wet porch.

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5

Akhmetov, D. G., and T. D. Akhmetov. "Swirl flow in vortex chamber." Science Bulletin 6, no. 4 (2015): 109–20. http://dx.doi.org/10.17117/nv.2015.04.109.

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6

Rajesh, T. N., T. J. S. Jothi, and T. Jayachandran. "Preliminary Studies on Non-Reactive Flow Vortex Cooling." Recent Patents on Mechanical Engineering 12, no. 3 (September 26, 2019): 262–71. http://dx.doi.org/10.2174/2212797612666190510115403.

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Background: The impulse for the propulsion of a rocket engine is obtained from the combustion of propellant mixture inside the combustion chamber and as the plume exhausts through a convergent- divergent nozzle. At stoichiometric ratio, the temperature inside the combustion chamber can be as high as 3500K. Thus, effective cooling of the thrust chamber becomes an essential criterion while designing a rocket engine. Objective: A new cooling method of thrust chambers was introduced by Chiaverni, which is termed as Vortex Combustion Cold-Wall Chamber (VCCW). The patent works on cyclone separators and confined vortex flow mechanism for providing high propellant mixing with improved degree of turbulence inside the combustion chamber, providing the required notion for studies on VCCW. The flow inside a VCCW has a complex structure characterised by axial pressure losses, swirl velocities, centrifugal force, flow reversal and strong turbulence. In order to study the flow phenomenon, both the experimental and numerical investigations are carried out. Methods: In this study, non-reactive flow analysis was conducted with real propellants like gaseous oxygen and hydrogen. The test was conducted to analyse the influence of mixture ratio and injection pressure of the propellants on the chamber pressure in a vortex combustion chamber. A vortex combustor was designed in which the oxidiser injected tangentially at the aft end near the nozzle spiraled up to the top plate and formed an inner core inside the chamber. The fuel was injected radially from injectors provided near the top plate and the propellants were mixed in the inner core. This resulted in enhanced mixing and increased residence time for the fuel. More information on the flow behaviour has been obtained by numerical analysis in Fluent. The test also investigated the sensitivity of the tangential injection pressure on the chamber pressure development. Results: All the test cases showed an increase in chamber pressure with the mixture ratio and injection pressure of the propellants. The maximum chamber pressure was found to be 3.8 bar at PC1 and 2.7 bar at PC2 when oxidiser to fuel ratio was 6.87. There was a reduction in chamber pressure of 1.1 bar and 0.7 bar at PC1 and PC2, respectively, in both the cases when hydrogen was injected. A small variation in the pressure of the propellant injected tangentially made a pronounced effect on the chamber pressure and hence vortex combustion chamber was found to be very sensitive to the tangential injection pressure. Conclusion: VCCW mechanism has been to be found to be very effective for keeping the chamber surface within the permissible limit and also reducing the payload of the space vehicle.

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7

Zehad, Shahadat Hossain, Sadman Al Faiyaz, Md Redwan Islam, and Dr Ing Irfan Ahmed. "Numerical Analysis of Gravitational Vortex Chamber." Technium: Romanian Journal of Applied Sciences and Technology 3, no. 10 (November 10, 2021): 11–22. http://dx.doi.org/10.47577/technium.v3i10.4955.

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A rotating mass of fluid is known as vortex and the motion of the rotating mass of fluid is known as vortex motion. Vorticity is the circulation per unit area. In this research simulation of a vortex chamber is to be carried out in ANSYS CFD taking water as fluid domain for generating a water vortex that is capable enough to move a turbine for electricity generation. The CAD modelling of the setup was set down and simulation was done in fine mesh by taking suitable wall function in the model of a cylindrical chamber along with a rectangular channel with a contraction portion at the end of it where good amount of vortex generation was acquired by observing velocity and pressure by setting different parameters. The results shows the pressure and velocity contours with 3D velocity streamline flow and the curve of the velocity and pressure curve shows the decrease of pressure and increase of velocity from inlet to outlet that leads to a decent vortex generation.

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8

Baranov, N. F., and A. A. Zykin. "Configuration of vortex chambers and air flow velocity in the crushing chamber of a hammer crusher." Traktory i sel hozmashiny 79, no. 9 (September 15, 2012): 39–41. http://dx.doi.org/10.17816/0321-4443-69486.

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9

Pasymi, Pasymi, Y. W. Budhi, A. Irawan, and Y. Bindar. "Three dimensional cyclonic turbulent flow structures at various geometries, inlet-outlet orientations and operating conditions." Journal of Mechanical Engineering and Sciences 12, no. 4 (December 27, 2018): 4300–4328. http://dx.doi.org/10.15282/jmes.12.4.2018.23.0369.

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Flow structure inside a chamber greatly determines the process performances. Therefore, the flow structure inside a chamber are often constructed in such a way as an effort to obtain equipment performances in accordance with the expectations. This study explored flow structure inside several chamber geometries and operating conditions. Three types of chamber, namely; GTC, DTC and TJC were set as the investigated chambers. The Computational Fluid Dynamics technique, supported by some experimental data from the literature, is used as an investigation method. The RANS based models, under Ansys-Fluent software were used in this numerical investigation. Simulation results revealed that the flow structures of GTC and DTC are predominantly created by spiral and vortex patterns. The vortex stabilizer diameter in the GTC affects the vortex pattern, velocity profile and pressure drop. The flow structure of DTC presents the most complex behavior. The flow structure inside TJC, in the case of unconfined outlet boundary, is characterized by the helical and wavy jet pattern. This structure is determined by the initial tangential intensity (IIT) and the inlet aspect ratio (RIA). The structures of vortex, helical, and wavy axial flow are properly constructed and visualized in this paper. There is no a turbulence model which is always superior to the other models, consistently. The standard k-ε model exhibits the realistic and robust performances among all of investigatied cases.

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10

Matveev, Konstantin I., and Jacob Leachman. "Numerical Simulations of Cryogenic Hydrogen Cooling in Vortex Tubes with Smooth Transitions." Energies 14, no. 5 (March 5, 2021): 1429. http://dx.doi.org/10.3390/en14051429.

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Improving efficiency of hydrogen cooling in cryogenic conditions is important for the wider applications of hydrogen energy systems. The approach investigated in this study is based on a Ranque-Hilsch vortex tube (RHVT) that generates temperature separation in a working fluid. The simplicity of RHVT is also a valuable characteristic for cryogenic systems. In the present work, novel shapes of RHVT are computationally investigated with the goal to raise efficiency of the cooling process. Specifically, a smooth transition is arranged between a vortex chamber, where compressed gas is injected, and the main tube with two exit ports at the tube ends. Flow simulations have been carried out using STAR-CCM+ software with the real-gas Redlich-Kwong model for hydrogen at temperatures near 70 K. It is determined that a vortex tube with a smooth transition of moderate size manifests about 7% improvement of the cooling efficiency when compared vortex tubes that use traditional vortex chambers with stepped transitions and a no-chamber setup with direct gas injection.

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11

NAKAYAMA, Yasuki, Katsumi AOKI, Hiroaki OHTA, and Hirohiko OGINO. "Characteristics of vortex chamber oscillation device." Transactions of the Japan Society of Mechanical Engineers Series B 52, no. 474 (1986): 727–32. http://dx.doi.org/10.1299/kikaib.52.727.

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12

Vatistas, Georgios H., Ali M. Jawarneh, and Henry Hong. "Flow Characteristics in a Vortex Chamber." Canadian Journal of Chemical Engineering 83, no. 3 (May 19, 2008): 425–36. http://dx.doi.org/10.1002/cjce.5450830305.

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13

Akhmetov, D. G., and T. D. Akhmetov. "Flow structure in a vortex chamber." Journal of Applied Mechanics and Technical Physics 57, no. 5 (September 2016): 879–87. http://dx.doi.org/10.1134/s0021894416050151.

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14

NAKAYAMA, Yasuki, Katsumi AOKI, Hiroaki OHTA, and Hirohiko OGINO. "Characteristics of Vortex Chamber Oscillation Device." Bulletin of JSME 29, no. 256 (1986): 3313–18. http://dx.doi.org/10.1299/jsme1958.29.3313.

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15

Rogovyi, A., V. Korohodskyi, S. Khovanskyi, I. Hrechka, and Y. Medvediev. "Optimal design of vortex chamber pump." Journal of Physics: Conference Series 1741 (January 2021): 012018. http://dx.doi.org/10.1088/1742-6596/1741/1/012018.

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16

Draganov, B. Kh, V. G. Demchenko, and N. D. Pogorelova. "METHOD OF PROFILING OF VORTEX VALVE CHAMBER." Industrial Heat Engineering 40, no. 4 (December 14, 2018): 58–61. http://dx.doi.org/10.31472/ihe.4.2018.08.

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The basics of designing a vortex chamber of an internal combustion engine are given. The described method allows to design the surface of the vortex chamber of the inlet channel that meets modern technological requirements.

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17

Hedlund, C. R., and P. M. Ligrani. "Local Swirl Chamber Heat Transfer and Flow Structure at Different Reynolds Numbers." Journal of Turbomachinery 122, no. 2 (February 1, 1999): 375–85. http://dx.doi.org/10.1115/1.555458.

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Local flow behavior and heat transfer results are presented from two swirl chambers, which model passages used to cool the leading edges of turbine blades in gas turbine engines. Flow results are obtained in an isothermal swirl chamber. Surface Nusselt number distributions are measured in a second swirl chamber (with a constant wall heat flux boundary condition) using infrared thermography in conjunction with thermocouples, energy balances, and in situ calibration procedures. In both cases, Reynolds numbers Re based on inlet duct characteristics range from 6000 to about 20,000. Bulk helical flow is produced in each chamber by two inlets, which are tangent to the swirl chamber circumference. Important changes to local and globally averaged surface Nusselt numbers, instantaneous flow structure from flow visualizations, and distributions of static pressure, total pressure, and circumferential velocity are observed throughout the swirl chambers as the Reynolds number increases. Of particular importance are increases of local surface Nusselt numbers (as well as ones globally averaged over the entire swirl chamber surface) with increasing Reynolds number. These are tied to increased advection, as well as important changes to vortex characteristics near the concave surfaces of the swirl chambers. Higher Re also give larger axial components of velocity, and increased turning of the flow from each inlet, which gives Go¨rtler vortex pair trajectories greater skewness as they are advected downstream of each inlet. [S0889-504X(00)00502-X]

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18

Georgantas, A. I., T. Krepec, and C. K. Kwok. "Flow Pattern of Solid Particles in a Double Vortex Chamber." Transactions of the Canadian Society for Mechanical Engineering 11, no. 1 (March 1987): 5–11. http://dx.doi.org/10.1139/tcsme-1987-0002.

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An experimentally determined air flow pattern in a double vortex chamber is utilized to predict the flow pattern of inserted solid particles. The minimum (critical) particle size retained in the vortex chamber is established in relation to different operating parameters. In view of possible applications of the double vortex chamber in combustion technology, an evaluation of the performance of the system at combustion operating conditions is also made. Experimental evidence of the predicted particle flow pattern is obtained for both cold and hot running conditions.

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19

Алексеенко, C. В., С. И. Шторк, and Р. Р. Юсупов. "Влияние способа подачи воздуха на параметры прецессирующего вихревого жгута в гидродинамической вихревой камере." Письма в журнал технической физики 44, no. 5 (2018): 79. http://dx.doi.org/10.21883/pjtf.2018.05.45711.16786.

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AbstractThe effect of the method of gas-phase injection into a swirled fluid flow on parameters of a precessing vortex core is studied experimentally. Conditions of the appearance of the vortex-core precession effect were modeled in a hydrodynamic sudden expansion vortex chamber. The dependences of the vortexcore precession frequency, flow-pulsation level, and full pressure differential in the vortex chamber on the consumption gas content in the flow have been obtained. The results of measurements permit one to determine optimum conditions for the most effective control of vortex-core precession.

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20

Dremov, V. S., S. I. Shtork, and I. K. Kabardin. "Determining the parameters of vortex structures in a hydrodynamic vortex chamber." Journal of Physics: Conference Series 980 (March 2018): 012013. http://dx.doi.org/10.1088/1742-6596/980/1/012013.

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21

Koike, Fumiya, and Toshio Takayama. "Generation of Concentration Gradients by a Outer-Circumference-Driven On-Chip Mixer." Micromachines 13, no. 1 (December 31, 2021): 68. http://dx.doi.org/10.3390/mi13010068.

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The concentration control of reagents is an important factor in microfluidic devices for cell cultivation and chemical mixing, but it is difficult to realize owing to the characteristics of microfluidic devices. We developed a microfluidic device that can generate concentration gradients among multiple main chambers. Multiple main chambers are connected in parallel to the body channel via the neck channel. The main chamber is subjected to a volume change through a driving chamber that surrounds the main chamber, and agitation is performed on the basis of the inequality of flow caused by expansion or contraction. The neck channel is connected tangentially to the main chamber. When the main chamber expands or contracts, the flow in the main chamber is unequal, and a net vortex is generated. The liquid moving back and forth in the neck channel gradually absorbs the liquid in the body channel into the main chamber. As the concentration in the main chamber changes depending on the pressure applied to the driving chamber, we generated a concentration gradient by arranging chambers along the pressure gradient. This allowed for us to create an environment with different concentrations on a single microchip, which is expected to improve observation efficiency and save space.

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22

Pitsukha, E. A., E. K. Buchilko, and Yu S. Teplitskii. "Investigation of the regularities of vortical flows in a cyclone-bed chamber." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 63, no. 3 (November 1, 2018): 307–17. http://dx.doi.org/10.29235/1561-8358-2018-63-3-307-317.

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Experimental investigation of the radial distributions of tangential and longitudinal velocities, total and static pressures in the vortex zone of a cyclone-bed chamber of diameter 0.21 m has been carried out. The experiments were carried out at various regime parameters (fraction of bottom blast, total air volume flow) and geometric parameters (diameter and shape of the outlet) of the chamber, and also in the presence of a fixed or fluidized bed of granular material. The influence of nonisotherm of bottom and tangential blast on the distribution pattern of velocity and pressure in the vortex zone of the cyclone-bed chamber is investigated. There was determined the influence of bottom blast temperature on the longitudinal velocity of air in the central part of the vortex zone chamber. It is shown that the diameter of the outlet has a significant effect on the pressure in the chamber. The longitudinal velocity in the central part of the chamber is practically independent of the shape of the outlet. The presence of the fluidized bed has an effect on the hydrodynamics of the cyclone-bed chamber vortex zone. In the presence of the fluidized bed there has been a violation of the self-similarity of hydrodynamic dimensionless parameters distribution in the vortex zone. The obtained experimental data were summarized within the framework of the similarity theory with the use of a dimensionless quantity characterizing the hydrodynamics of an inhomogeneous fluidized bed – the Froude number (Fr). The use of the Froude number makes it possible to take into account the effect of the fluidized bed hydrodynamics on the features of air velocity and pressure distributions in the vortex zone, and also takes into account the influence of such an important factor as the fraction of bottom blast.

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23

Wu, Ming-Hsun, Yanxing Wang, Richard A. Yetter, and Vigor Yang. "Liquid Monopropellant Combustion in Mesoscale Vortex Chamber." Journal of Propulsion and Power 25, no. 3 (May 2009): 829–32. http://dx.doi.org/10.2514/1.40662.

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24

., Gheisi Ali Reza, and Keshavarzi Ali Reza . "Riverine Flow Sediment Exclusion Using Vortex Chamber." Journal of Fisheries and Aquatic Science 1, no. 2 (April 15, 2006): 142–56. http://dx.doi.org/10.3923/jfas.2006.142.156.

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25

Duarte, Carlos Antonio Ribeiro, Francisco José de Souza, and Vinicius Fagundes dos Santos. "Mitigating elbow erosion with a vortex chamber." Powder Technology 288 (January 2016): 6–25. http://dx.doi.org/10.1016/j.powtec.2015.10.032.

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26

YOKOO, Kazuyuki, Shigeru MATSUO, Yuhi MATSUNO, Toshiaki SETOGUCHI, and Heuy-Dong KIM. "620 Flow Characteristic in a Vortex Chamber." Proceedings of Conference of Kyushu Branch 2014.67 (2014): _620–1_—_620–2_. http://dx.doi.org/10.1299/jsmekyushu.2014.67._620-1_.

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27

Athar, Mohammad, U. C. Kothyari, and R. J. Garde. "STUDIES ON VORTEX CHAMBER TYPE SEDIMENT EXTRACTOR." ISH Journal of Hydraulic Engineering 8, no. 2 (January 2002): 1–16. http://dx.doi.org/10.1080/09715010.2002.10514711.

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28

Shtym, Anatolii N., and Konstantin A. Shtym. "SPECIFIC FEATURES OF CYCLONE-VORTEX CHAMBER AERODYNAMICS." JP Journal of Heat and Mass Transfer 15, no. 2 (May 1, 2018): 257–80. http://dx.doi.org/10.17654/hm015020257.

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29

NAKAYAMA, Yasuki, Makoto OKI, and Katsumi AOKI. "Characteristics Analysis of Vortex Chamber Oscillation Device." Journal of the Visualization Society of Japan 14, Supplement2 (1994): 137–40. http://dx.doi.org/10.3154/jvs.14.supplement2_137.

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30

Rogovyi, A. "Energy performances of the vortex chamber supercharger." Energy 163 (November 2018): 52–60. http://dx.doi.org/10.1016/j.energy.2018.08.075.

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31

Zaslavskii, B. I., and B. V. Yur'ev. "Flow structure in a flat vortex chamber." Journal of Applied Mechanics and Technical Physics 39, no. 1 (January 1998): 73–77. http://dx.doi.org/10.1007/bf02468000.

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32

Skripkin, Sergey, Sergey Dremov, Sergey Shtork, and Ivan Kabardin. "Experimental Investigation Of Couple Precessing Vortex Ropes In A Hydraulic Vortex." Siberian Journal of Physics 11, no. 4 (December 1, 2016): 17–24. http://dx.doi.org/10.54362/1818-7919-2016-11-4-17-24.

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The work is devoted to the experimental study of the interaction of the precessing vortex pair in the hydrodynamic vortex chamber. Swirling flow was created by a 12 tangentially directed rectangular nozzles. Design swirl number was varied in the range 0÷6.6 based on the geometry of the swirl device. The Reynolds number was varied in the range of 6 000÷52 000. Preliminary visual experiments has been conducted with changing output boundary conditions for controlling parameters of the vortex structure. It was found that stable mode with a double precessing structure is realized at full open outlet. Setting of diaphragm on the outlet of vortex chamber allows us to suppress the precession motion and significantly stabilize the flow. Further experiments included the quantitative measurement of the velocity distributions carried out using a laser Doppler anemometry (LDA).

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33

Ghafourian, A., M. H. Saidi, S. Jahangirian, and M. Abarham. "Effect of Vortex Flow on Heat Transfer to Combustion Chamber Wall." Journal of Engineering for Gas Turbines and Power 129, no. 2 (July 28, 2006): 622–24. http://dx.doi.org/10.1115/1.2431386.

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A new experimental facility was designed, fabricated, and tested to model and study the effect of bidirectional swirl flow on the rate of heat transfer to combustion chamber walls. Reduction of this heat transfer can result in time and cost of design and fabrication methods of combustion chambers. The experimental study was performed using propane and air with oxygen as fuel and oxidizer, respectively. For similar flow rates, in cases where bidirectional flow was present, wall temperature reductions of up to 70% were observed. In cases where only some of the oxidizer was injected from the chamber end to generate the bidirectional swirl flow, the lowest wall temperature existed. This can be due to better mixing of fuel and oxidizer and absence of hot spots in the combustion core.

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34

Legler, Marko, Lajos Koy, Norbert Kummerfeld, and Michael Fehr. "Color Flow Doppler Echocardiography in Healthy Racing Pigeons (Columba livia f. domestica) and the Evidence of Physiological Blood Flow Vortex Formations." Veterinary Sciences 7, no. 2 (May 4, 2020): 60. http://dx.doi.org/10.3390/vetsci7020060.

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In avian medicine, Doppler sonographic techniques are used to visualize and estimate blood flow in the heart. In the literature there is a lack of standardized studies of the use of color Doppler flow on healthy avian species. For this purpose, we examined blood flow in the heart in the four-chamber view of clinically healthy awake racing pigeons (n = 43) by color flow Doppler sonography. With this technique the diastolic and systolic blood flow in the heart chambers and the heart valve regions were well visualized. However, the pulse repetition frequency must be adapted to the specific blood flow velocities of the heart region to be measured to reduce aliasing in higher velocities and to visualize blood flow of lower velocities. With the help of color Doppler imaging in the four-chamber view, typical physiological atrial and ventricular blood flow vortex formations were visualized in the avian heart for the first time. In the left ventricle an asymmetric vortex ring in the passive and active ventricular filling, in the right ventricle a great counter-clockwise blood vortex in the active ventricular filling, in the left atrium a vortex clockwise, and in the right atrium counter-clockwise were observed. The knowledge of these physiological blood flow vortices is important to identify pathological blood flow.

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35

Shtork, S. I., E. S. Gesheva, P. A. Kuibin, V. L. Okulov, and S. V. Alekseenko. "Parametric Description of the Stationary Helical Vortex in a Hydrodynamic Vortex Chamber." Journal of Applied Mechanics and Technical Physics 61, no. 3 (May 2020): 359–67. http://dx.doi.org/10.1134/s0021894420030062.

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36

Shtork, S. I., E. S. Gesheva, P. A. Kuibin, V. L. Okulov, and S. V. Alekseenko. "Parametric Description of the stationary Helical Vortex in a Hydrodynamic Vortex Chamber." Прикладная механика и техническая физика 61, no. 3 (2020): 52–62. http://dx.doi.org/10.15372/pmtf20200306.

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37

Li, Hong-Wei, Yin-Feng Gao, Chang-He Du, and Wen-Peng Hong. "Analysis of vortex cooling fluid-structure interaction under different vortex chamber curvature." International Journal of Thermal Sciences 170 (December 2021): 107154. http://dx.doi.org/10.1016/j.ijthermalsci.2021.107154.

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38

Yusupov, Roman, Sergey Shtork, and Sergey Alekseenko. "Study Of Strongly Swirling Gas-Liquid Flows In A Hydrodynamic Vortex Chamber." Siberian Journal of Physics 11, no. 1 (March 1, 2016): 45–55. http://dx.doi.org/10.54362/1818-7919-2016-11-1-45-55.

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The work is devoted to experimental study of one-phase and two-phase swirling flow in a horizontal vortex chamber with a tangential swirler. Special attention is paid to an emergence of unsteady vortex structures. Formation of a precessing vortex core (PVC) in the nozzle has been detected in the case of one-phase flow. Linear dependence of the PVC precession frequency and quadratic dependence of the full pressure drop in the vortex chamber on the fluid flow rate were confirmed experimentally. In the case of two-phase flow a high-speed visualization allowed to reveal the presence of the secondary vortex structures in cylindrical region behind the zone of sudden expansion. Adding a gas phase into the flow leads to a sharp decline of the precession frequency and full pressure drop decrease in the vortex chamber. The frequency smoothly decreases with further increase of gas content and pressure drop changes insignificantly: slightly increases or decreases depending on the water flow rate. At the same time there is a coherent change of the flow’s integral characteristics at changing the flow rates of liquid and gas.

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T.N., Rajesh, T. J. Sarvoththama Jothi, and Jayachandran T. "Cold flow studies in a vortex thrust chamber." Aircraft Engineering and Aerospace Technology 91, no. 1 (January 7, 2018): 69–77. http://dx.doi.org/10.1108/aeat-07-2017-0167.

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Purpose The purpose of this paper is to estimate the chamber pressure and flow behaviour in a vortex thrust chamber (VTC) during the cold flow with hydrogen and oxygen as propellants. Design/methodology/approach Experiments are carried out in a VTC with a different mixture ratio of hydrogen and oxygen. The pressures developed inside the VTC are measured. Numerical simulations are carried out to understand the flow patterns of fuel and oxidizer inside the VTC. Findings The chamber pressure is influenced by the type of injection of propellant and mixture ratio. Tangential injection of propellant is the key parameter for an increase of the chamber pressure of the VTC. Research limitations/implications The pressure measurements are carried out in cold flow conditions without combustion happening in the VTC. Practical implications The practical implication is that when the combustion in the VTC ceases, the thrust generated due to the propellants in cold flow conditions can be assessed. Originality/value The VTC with the tangential injection of propellant generates higher chamber pressure.

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Anokhina, Elizaveta, Dmitriy Dekterev, Sergey Shtork, and Sergey Alekseenko. "Investigation of Stationary Vortex Structures in the Model Combustion Chamber." Siberian Journal of Physics 7, no. 2 (June 1, 2012): 56–65. http://dx.doi.org/10.54362/1818-7919-2012-7-2-56-65.

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This work focuses on experimental and numerical study of stationary vortex structures in a model of vortex combustion chamber of the tangential type. The experiments included the visualization of vortex structures in the work area using a laser light source and a digital high-definition cameras. The calculations were performed using a commercial package STAR-CCM +. From known turbulence models have been chosen the most suitable for the problem under investigation. In the calculations we obtained results that agree well with experimental data, which confirms the adequacy of employed numerical model

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Yan, Linlin, Zhuanyong Zou, Longdi Cheng, Guo Wei, and Peijun Tang. "Numerical simulation of flow field in the twisting chamber of Murata vortex spinning based on the hollow spindle with different structures." Textile Research Journal 89, no. 4 (January 18, 2018): 645–56. http://dx.doi.org/10.1177/0040517517753637.

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The novel hollow spindle with spiral guide grooves is introduced into the manufacture of Murata vortex spun yarn for the sake of enhancing the vortex yarn’s strength. By means of numerical simulation, the airflow characteristics in the conventional twisting chamber and novel twisting chamber of Murata vortex spinning are obtained and compared in order to explain yarn formation for adoption of the novel hollow spindle. The airflow distribution near the spiral guide grooves is analyzed, and the influence of airflow changes caused by the groove structure on the movement of the free end fibers and the yarn strength is analyzed. The results show that the spiral guide grooves will influence the pressure and velocity distribution in the twisting chamber, especially near the areas of the guide grooves. The guide grooves can guide the swirling airflow moving down the conical cavity of the twisting chamber, resulting in increases of the tangential, axial, and radial velocities of airflow in the conical cavity. And it is expected to produce fiber migration in the yarn cross-section and the self-twist effect of wrapped fibers. These phenomena will strengthen the wrapping and twisting effect of the free end fibers and inter-fiber cohesive force of vortex spun yarn in the process of yarn formation, and finally improve the strength of vortex spun yarn due to adopting the novel hollow spindle.

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42

Ao, Xuefei, Xiaoling Wang, Bin Qiao, Ruijin Li, and Ruirui Sun. "Large eddy simulation of the turbulent multiphase flow on sandstone wastewater of hydropower stations in a vortex-type grit chamber." Canadian Journal of Civil Engineering 42, no. 8 (August 2015): 510–20. http://dx.doi.org/10.1139/cjce-2015-0063.

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Vortex-type grit chambers are commonly used for the treatment of high-turbidity sandstone wastewater in hydropower stations. Current researches on vortex-type grit chambers mainly focus on the optimization of the engineering operation parameters. Although there have been many studies on sandstone wastewater simulations in stirred tanks or hydrocyclones predicted by Reynolds-averaged Navier–Stokes, there are few reports on the large eddy simulation (LES) based prediction of the multiphase flows in a vortex-type grit chamber. The rigid-lid approximation is commonly used for free surface movement. The LES can reveal more detailed pulsation features. The volume of fluid (VOF) method can describe the interfacial turbulence characteristics for free surface movement. Thus, the VOF method was used as a surface tracking technique along with LES–Lagrangian model to study the characteristics of gas–liquid–solid multiphase flows. The flow field distributions were analyzed and the micro movement regularities of particles were discussed.

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Merzliakov, Iurii, Ivan Pavlenko, Marek Ochowiak, Vitalii Ivanov, and Praveen Agarwal. "Flow Modeling in a Vortex Chamber of a Liquid–Steam Jet Apparatus." Processes 10, no. 5 (May 16, 2022): 984. http://dx.doi.org/10.3390/pr10050984.

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The article investigated the flow of boiling streams through a nozzle with an oblique cut. Due to this flow organization, deviation from the nozzle axis at the vortex chamber inlet occurred. The study of flow modeling in the inlet section was carried out. The flow design and the calculation scheme of the vortex liquid–steam jet apparatus were proposed. Analytical expressions between the main operating parameters were obtained according to the developed mathematical model. A recommended oblique-cut angle for the active-flow nozzle was evaluated considering the transition through the first critical section based on the tangential velocity flow model. Validation of the mathematical model in the inlet section of the vortex chamber was provided based on the comparison with available experimental data. Flow visualization in the inlet section of the vortex chamber was obtained. The assumption of uneven flow distribution was confirmed experimentally. Overall, the boiling liquid flow was implemented in the active flow nozzle. The obtained scientific and practical results help to determine geometric parameters and physical characteristics of the vortex-type liquid–steam jet apparatus at the design stage. The obtained results were implemented to modernize vacuum units based on vortex type liquid–steam jet apparatuses.

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Vatistas, Georgios H., and Peter Sakaris. "Pressure Drop Across a Double-Outlet Vortex Chamber." Journal of Propulsion and Power 17, no. 3 (May 2001): 711–16. http://dx.doi.org/10.2514/2.5800.

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Vatistas, G. H., S. Lin, and C. K. Kwok. "Theoretical and experimental studies on vortex chamber flows." AIAA Journal 24, no. 4 (April 1986): 635–42. http://dx.doi.org/10.2514/3.9319.

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Сёмин, Дмитрий Александрович, Андрей Сергеевич Роговой, Артем Николаевич Левашов, and Ярослав Николаевич Левашов. "VERIFICATION OF FLOW IN THE VORTEX CHAMBER DEVICES." Journal of Mechanical Engineering the National Technical University of Ukraine "Kyiv Polytechnic Institute" 2, no. 77 (November 17, 2016): 71–78. http://dx.doi.org/10.20535/2305-9001.2016.77.74796.

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Rogovyi, Andrii. "VERIFICATION OF FLUID FLOW CALCULATIONS IN VORTEX CHAMBER." Automobile Transport, no. 39 (December 23, 2016): 39. http://dx.doi.org/10.30977/at.2219-8342.2016.39.0.39.

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Matsuo, Shigeru, Yuhi Matsuno, Yusuke Fukushima, Mohammad Mamun, Tokitada Hashimoto, Toshiaki Setoguchi, and Heuy Dong Kim. "Experimental Study on Temperature Separation in Vortex Chamber." Procedia Engineering 105 (2015): 464–71. http://dx.doi.org/10.1016/j.proeng.2015.05.073.

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Li, Yunjie, and Qizhong Guo. "Angular Velocity Formula for Turbulent Vortex Chamber Flows." Journal of Hydraulic Engineering 138, no. 5 (May 2012): 467–70. http://dx.doi.org/10.1061/(asce)hy.1943-7900.0000547.

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Voronin, D. V. "Gas self-ignition in a plane vortex chamber." Combustion, Explosion, and Shock Waves 53, no. 5 (September 2017): 510–16. http://dx.doi.org/10.1134/s0010508217050033.

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