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Articoli di riviste sul tema "Swirling"

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Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 9 febbraio 2022

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1

Iguchi, Manabu, Daisuke Iguchi, Yasushi Sasaki e Shinichiro Yokoya. "FUNDAMENTAL CHARACTERISTICS OF SWIRLING JETS IN CYLINDRICAL VESSEL(Swirling Flow and Separation)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 691–95. http://dx.doi.org/10.1299/jsmeicjwsf.2005.691.

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2

Iguchi, Manabu, Moriyoshi Shitara, Daisuke Iguchi, Yasushi Sasaki e Shinichiro Yokoya. "PRACTICAL APPLICATIONS OF SWIRLING JETS TO MIXING PROCESSES(Swirling Flow and Separation)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 697–701. http://dx.doi.org/10.1299/jsmeicjwsf.2005.697.

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3

Brecher, Mark E., e Shauna N. Hay. "Platelet swirling". Transfusion 44, n. 5 (26 aprile 2004): 627. http://dx.doi.org/10.1111/j.1537-2995.2004.03428.x.

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4

Huang, Congcong. "Swirling swimmer". Nature Nanotechnology 14, n. 7 (luglio 2019): 638. http://dx.doi.org/10.1038/s41565-019-0509-8.

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5

Watts, Abhishek, e Sandeep K. Gupta. "Swirling Fat". Journal of Pediatric Gastroenterology and Nutrition 63, n. 6 (dicembre 2016): e204. http://dx.doi.org/10.1097/mpg.0000000000000745.

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6

Mantoura, Samia. "Cyclonic swirling". Nature Climate Change 1, n. 707 (27 giugno 2007): 18. http://dx.doi.org/10.1038/climate.2007.17.

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7

Musser, George. "Swirling Dust". Scientific American 286, n. 1 (gennaio 2002): 23. http://dx.doi.org/10.1038/scientificamerican0102-23b.

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8

Zeng, Jie, Zhi Yan Hou e Hao Zeng Jiang. "The Numerical Simulation of Swirling Airflow Field for Different Swirling Airflow Head in Swirling Airflow Finishing". Applied Mechanics and Materials 678 (ottobre 2014): 582–86. http://dx.doi.org/10.4028/www.scientific.net/amm.678.582.

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The key of swirling airflow finishing is how to generate the swirling airflow. In the paper, three swirling airflow head are discussed according the manners of tangential inflow. By means of FLUENT, the general software of CFD, the swirling airflow field from different airflow head is simulated. The simulation results are shown by the flow line graphs, tangential velocity, radial distribution graphs, etc. All we have studied is as the basis for the determination of the application scope of each swirling airflow head.

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9

Zhang, Jian, Qun Zheng, Guoqiang Yue e Yuting Jiang. "Investigation on flow field and heat transfer characteristics of film cooling with different swirling directions for coolant flow". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 235, n. 6 (2 marzo 2021): 1394–405. http://dx.doi.org/10.1177/0957650921997633.

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In this paper, a hexagonal prism inlet chamber is used to form a swirling flow for the film cooling, and three kinds of compound angle of film hole ( γ = 10°, 20°, 30°) with clockwise swirling or counterclockwise swirling are used for numerical simulation studies. The influence of different compound angles of film hole and the swirling directions for the film cooling effectiveness are obtained. The results show that the film cooling effectiveness and spanwise cooling coverage range of the clockwise swirling or counterclockwise swirling flow both are low when the compound angle of film hole is 10°. With the increasing compound angle of film hole, the kidney shaped vortex of film hole exit gradually weakens until it disappears, which reduces the entrainment effect by the coolant jet. So that the spanwise coverage range of two swirling modes is obviously improved. When the compound angle of film hole is 30° compared to 10°, the average spanwise film cooling effectiveness of clockwise swirling and counterclockwise swirling are increased by about 133.75 and 212.6%, respectively. The average spanwise film cooling effectiveness on the downstream of film hole for counterclockwise swirling is increased by about 140% compared with clockwise swirling.

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10

Laszlo, Fuchs. "PS01 SWIRLING PREMIXED FLAME STABILIZATION". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013): _PS01–1_—_PS01–1_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._ps01-1_.

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11

Gui, Nan. "Numerical Study of Vortex Evolution and Correlation between Twin Swirling Flows". Advanced Materials Research 516-517 (maggio 2012): 976–79. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.976.

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Swirling flows are widely used in energy engineering, such as swirling combustor, cyclone separator in pulverized coal burners. The vortex evolution and correlation between twin swirling flows are investigated via direct numerical simulation. Three typical swirl flows with different swirl number are simulated. The structure of vortex evolution, velocity correlation between the twin flows are illustrated and analyzed in detail. The results show the phase-locked correlation of flow velocity between the twin swirling jets which would be useful and helpful for improving the understanding of aerodynamics of multi-swirling systems.

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12

Krain, H. "Swirling Impeller Flow". Journal of Turbomachinery 110, n. 1 (1 gennaio 1988): 122–28. http://dx.doi.org/10.1115/1.3262157.

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The results of extensive laser measurements carried out in the blade passages of a newly designed backswept impeller are presented and discussed. Noticeable distortions of the throughflow patterns and a distinct swirling flow character were found inside the rotor. The measurement results and a simple theoretical approach suggest that the distorted throughflow patterns and the secondary flows are caused by a vortex flow. Although the relative flow has been significantly decelerated a comparatively smooth velocity profile has been identified at the rotor discharge that differed widely from the well-known jet/wake-type flow pattern.

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13

Ramos, J. I. "Incompressible swirling flows". Engineering Computations 3, n. 1 (gennaio 1986): 53–63. http://dx.doi.org/10.1108/eb023641.

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14

Carriveau, E. C., R. E. Baddour e G. A. Kopp. "The entrainment envelope of dye-core vortices at submerged hydraulic intakes". Canadian Journal of Civil Engineering 29, n. 3 (1 giugno 2002): 400–408. http://dx.doi.org/10.1139/l02-015.

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Each winter in Canada, operational difficulties are encountered at various water works resulting from intake blockages caused by frazil ice entrainment. In a lake setting, frazil is a surface phenomenon, the strong downward current produced by a swirling flow, with an intake vortex present, provides a mechanism by which frazil is transported from the water surface to the submerged intake below. Laboratory experiments were conducted to study the entrainment envelope associated with swirling and non-swirling flows into submerged water intakes. Three-dimensional velocity measurements were made with an acoustic Doppler velocimeter. The results clearly show that the entrainment envelope for swirling flow is several times larger than that for non-swirling flow. This paper details, for a given set of conditions, the differences in the non-swirling and swirling flow entrainment envelopes and emphasizes the potential difficulties with frazil ice that vortices can cause at intakes.Key words: vortex, dye-core vortex, submerged hydraulic intake, entrainment envelope, three-dimensional velocity measurements, acoustic Doppler velocimeter.

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15

Zhang, Dong Su, e Li Hong Liu. "A Study on Speed of Fluid in Swirling Abrasive Jet Nozzle and Drilling Hole Performance". Advanced Materials Research 291-294 (luglio 2011): 3434–39. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.3434.

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By placing the whirling element in the nozzle body, swirling abrasive jet has been produced. The speed function of spiral groove and swirling contraction segment in inner of nozzle are analyzed. And the formulas of speed function are obtained. It is seen that movement of fluid in the spiral groove is regarded as spiral one-dimension axial symmetry, movement of fluid in the swirling contraction as spiral two-dimension axial symmetry. The swirling abrasive jet system has been established. The production method and the drilling test system of the swirling abrasive jet are introduced. The drilling mechanism of the swirling abrasive jet is analyzed. Through experiment, the effects of the whirling element structure and the jet parameters on drilling performance are studied. The results indicated that in the case of nozzle non-rotation, under the working pressure of 10 MPa, swirling abrasive jet can drill a deep hole on coal block of which Polodyakonov coefficient f is about 4, and that the diameter of the hole is 20~30 times the size of the nozzle exit diameter. So the swirling abrasive jet has a good drilling performance.

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16

Ibrahim, E. A., e T. R. McKinney. "Injection characteristics of non-swirling and swirling annular liquid sheets". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 220, n. 2 (1 febbraio 2006): 203–14. http://dx.doi.org/10.1243/09544062c02505.

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A simplified mathematical model, based on body-fitted coordinates, is formulated to study the evolution of non-swirling and swirling liquid sheets emanated from an annular nozzle in a quiescent surrounding medium. The model provides predictions of sheet trajectory, thickness, and velocity at various liquid mass flowrates and liquid-swirler angles. It is found that a non-swirling annular sheet converges towards its centreline and assumes a bell shape as it moves downstream from the nozzle. The bell radius and length are more pronounced at higher liquid mass flowrates. Both the thickness and the stream-wise velocity of the non-swirling annular sheet are reduced with an increase in mass flowrate. The introduction of swirl results in the formation of a diverging hollow-cone sheet. The hollow-cone divergence from its centreline is enhanced by an increase in liquid mass flowrate or liquid-swirler angle. The hollow-cone sheet radius, curvature, and stream-wise velocity increase, whereas its thickness is diminished as a result of increasing the mass flowrate or liquid-swirler angle. The tangential velocity is greater at higher mass flowrates or smaller liquid-swirler angles. The present results are compared with previous studies and conclusions are drawn.

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17

Zhen, H. S., C. W. Leung e C. S. Cheung. "Emission of impinging swirling and non-swirling inverse diffusion flames". Applied Energy 88, n. 5 (maggio 2011): 1629–34. http://dx.doi.org/10.1016/j.apenergy.2010.11.036.

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18

Ahmed, Zahir U., Yasir M. Al-Abdeli e Ferdinando G. Guzzomi. "Impingement pressure characteristics of swirling and non-swirling turbulent jets". Experimental Thermal and Fluid Science 68 (novembre 2015): 722–32. http://dx.doi.org/10.1016/j.expthermflusci.2015.07.017.

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19

Schmidt, Heinrich, Martin Depner e Michael Kabesch. "Medial Position and Counterclockwise Rotation of the Parietal Scalp Hair-Whorl as a Possible Indicator for Non-Right-Handedness". Scientific World JOURNAL 8 (2008): 848–54. http://dx.doi.org/10.1100/tsw.2008.113.

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The objective of our study was to assess the association between position and swirling direction of the parietal whorl (PW) and handedness. In 519 patients of a pediatric practice, PWs were located and the swirling direction determined. Of those patients, handedness could be specified in 217. The right-sided PW (n = 347; 70.8%) and the clockwise (CW) swirling type (n = 411; 83.9%) of all participants were predominant in children with one PW. Non-right-handedness (NRH) was found in 40 (18.4%). Medial position of the whorl per se increases the chance for NRH, indifferent of the swirling direction. In patients with counterclockwise (CCW) swirling, the chance of NRH increased 3.5-fold for the right-sided, 5.4-fold for the left-sided, and 12.9-fold for the medial-positioned whorl. We conclude that NRH is associated with the position (medial!) and the swirling direction (CCW!) of the PW.

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20

Gao, Huanhuan, Zaiguo Fu, Zhuoxiong Zeng, Jiang Liu e Peifen Weng. "Effects of Swirling Strength of the Premixed Gas Flow on Pollutant Emission in a Heavy-Duty Gas Turbine". E3S Web of Conferences 118 (2019): 04038. http://dx.doi.org/10.1051/e3sconf/201911804038.

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The combustion process and pollutant emission of an annular combustion chamber for a heavy-duty gas turbine were investigated by numerical method. The realizable k-ε model and finite rate/eddy dissipation model were adopted for calculations of turbulence and combustion. The effects of different swirling numbers of the double-swirler inlet on the temperature distribution and the thermal NOx formation in the combustion chamber were analyzed. The results show that the change of the swirling number of the outer swirling flow has a greater influence on the generation of the thermal NOx when compared with that of the inner swirling flow. The maximum average temperature of the central cross section of the combustor does not exceed 1760K. The average mass fraction of the generated thermal NOx at the exit decreases with the increasing outer swirling number. When the outer swirling number is less than 0.8, the generation of the thermal NOx is severe at the side wall of the combustion chamber.

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21

Ahmed, Zahir U., Yasir M. Al-Abdeli e Ferdinando G. Guzzomi. "Heat transfer characteristics of swirling and non-swirling impinging turbulent jets". International Journal of Heat and Mass Transfer 102 (novembre 2016): 991–1003. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.06.037.

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22

Gomez, L., R. Mohan e O. Shoham. "Swirling Gas–Liquid Two-Phase Flow—Experiment and Modeling Part II: Turbulent Quantities and Core Stability". Journal of Fluids Engineering 126, n. 6 (1 novembre 2004): 943–59. http://dx.doi.org/10.1115/1.1849254.

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In Part I of this two-part paper on swirling gas–liquid two-phase flow, correlations have been developed for the continuous liquid-phase velocity field under swirling conditions, such as that occurring in the lower part of the Gas–Liquid Cylindrical Cyclone (GLCC©1) compact separator. The developed correlations, including the axial, tangential, and radial velocity distributions, are applicable for swirling flow in both cyclones and pipe flow. The first objective of this paper is to extend the study of Part I by developing correlations for the turbulent quantities of the continuous liquid phase, including the turbulent kinetic energy and its dissipation rate and Reynolds shear stresses. The second objective is to study experimentally and theoretically two-phase swirling flow gas-core characteristics and stability. The first objective has been met utilizing local LDV measurements acquired for swirling flow. The developed turbulent quantities correlations have been tested against data from other studies, showing good agreement. For the second objective, experimental data have been acquired under swirling two-phase flow conditions. A model for the prediction of the gas-core diameter and stability in swirling flow field has been developed, based on the turbulent kinetic energy behavior predicted by the developed correlations. Good agreement is observed between the model predictions and the data.

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23

Yang, Jing, Qingjuan Hu, Zhengwei Wang, Jinghuan Ding e Xianyu Jiang. "Effects of inlet cavitation on swirling flow in draft-tube cone". Engineering Computations 35, n. 4 (11 giugno 2018): 1694–705. http://dx.doi.org/10.1108/ec-08-2017-0313.

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Purpose For Francis turbine, the vortex flow in the draft tube plays an important role in the safe and efficient operating of hydraulic turbine. The swirling flow produced at the blade trailing edge at off-design conditions has been proved to be the fundamental reason of the vortex flow. Exploring the swirling flow variations in the non-cavitation flow and cavitation flow field is an effective way to explain the mechanism of the complex unsteady flow in the draft tube. Design/methodology/approach The swirling flow in different cavitation evolution stages of varying flow rates was studied. The swirl number, which denotes the strength of the swirling flow, was chosen to systematically analyze the swirling flow changes with the cavitation evolutions. The Zwart–Gerber–Blemari cavitation model and SST turbulence model were used to simulate the two-phase cavitating flow. The finite volume method was used to discrete the equations in the unsteady flow field simulation. The Frozen Rotor Stator scheme was used to transfer the data between the rotor-stator interfaces. The inlet total pressure was set to inlet boundary condition and static pressure was set to outlet boundary condition. Findings The results prove that the mutual influences exist between the swirling flow and cavitation. The swirling flow was not only affected by the load but also significantly changed with the cavitation development, because the circumferential velocity decrease and axial velocity increase presented with the cavitation evolution. At the high load conditions, the system stability may improve with the decreasing swirling flow strength. Research limitations/implications Further experimental and simulation studies still need to verify and estimate the reasonability of the swirling flow seen as the cavitation inception signal. Originality/value One interesting finding is that the swirl number began to change as the inception cavitation appeared. This is meaningful for the cavitation controlling in the Francis turbine.

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24

Gomez, L., R. Mohan e O. Shoham. "Swirling Gas–Liquid Two-Phase Flow—Experiment and Modeling Part I: Swirling Flow Field". Journal of Fluids Engineering 126, n. 6 (1 novembre 2004): 935–42. http://dx.doi.org/10.1115/1.1849253.

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Compact cyclonic separators are based on swirling flow, whereby the phases are separated due to the centrifugal forces generated by the flow. This phenomenon is common in several compact separators used by the oil, process, and aerospace industries. The objective of this paper is to study experimentally the hydrodynamics of the continuous liquid phase under swirling two-phase flow, such as that occurring in the lower part of the Gas–Liquid Cylindrical Cyclone (GLCC©1) compact separator and develop a model to characterize it. Local LDV measurements for a swirling flow field have been analyzed and utilized to develop cyclone and pipe swirling flow field prediction correlations. The developed correlations, including the axial, tangential, and radial velocity distributions, have been tested and validated against data from other studies, showing good agreement. The velocity field correlations can be used to analyze swirling two-phase flow in cyclonic separators and pipes. In part II of this two-part paper, correlations are developed for the turbulent quantities, and core characteristics and stability for swirling two-phase flow.

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25

Abricka, M., I. Barmina, R. Valdmanis e M. Zake. "Experimental and Numerical Study of Swirling Flows and Flame Dynamics". Latvian Journal of Physics and Technical Sciences 51, n. 4 (1 agosto 2014): 25–40. http://dx.doi.org/10.2478/lpts-2014-0021.

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Abstract The effect of swirling air on the flow dynamics was investigated for the cold non-reacting flows and the flame arising at thermo-chemical conversion of biomass pellets downstream of a cylindrical channel. Under experimental and numerical investigation was the swirling flow dynamics with the primary axial air supply below a biomass layer and swirling air supply above it. The results indicate that for cold flows the swirling air jet outflow from tangential nozzles leads to the formation of a complex flow dynamics which is influenced both by upstream and downstream air swirl propagation near the channel walls, with correlating swirl-enhanced formation of the upstream and downstream axial flows close to the flow centreline depending on the swirling air supply rate. These axial flows can be completely balanced at their stagnation within the axial recirculation zone. It is shown that at equal boundary conditions for the swirling flame and the cold flows the swirling flow dynamics is influenced by the upstream air swirl-enhanced mixing of the reactants below the air swirl nozzles. This determines the formation of a downstream reaction zone with correlating development of the flow velocity, temperature and composition profiles in the downstream flame regions with improved combustion stability. The low swirl intensity in these regions prevents the formation of a recirculation zone

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26

ZHAN, FAN, ZENGSHENG CHEN e XIAOYAN DENG. "SWIRLING FLOW CAN SUPPRESS MONOCYTES ADHESION IN END-TO-END ARTERIAL ANASTOMOSIS". Journal of Mechanics in Medicine and Biology 14, n. 05 (agosto 2014): 1450080. http://dx.doi.org/10.1142/s0219519414500808.

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To test the hypothesis that the monocytes adhesion would be suppressed by intentionally inducing swirling flow in end-to-end arterial anastomosis to inhibit the flow disturbance, the comparing experimental and numerical investigation under both normal flow condition and swirling flow condition were executed, in which the sudden expanded tube and U-937 cells were used. The numerical results reveal that, comparing to normal flow, the swirling flow could reduce the size of flow disturbed zones and enhance the wall shear stress (WSS) in the closed downstream of sudden expanded tube. The experimental results show that there are disturbed flow zones in the sudden expanded tube, where the adhesion number of U-937 cells is larger than other zones. More importantly, comparing to the normal flow, the swirling flow could reduce the adhesion of U-937 cells, in which the adhesion number become smaller with the increasing of the swirling intensity. Therefore, the present study suggests that intentionally introducing swirling flow in end-to-end arterial anastomosis may be a solution to solve the problem of intimal hyperplasia (IH) by suppressing the flow disturbance and restraining the adhesion of monocytes to keep the favorably unimpeded flow.

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27

Rowhani, Amir, e Sadegh Tabejamaat. "Experimental study of the effects of swirl and air dilution on biogas non-premixed flame stability". Thermal Science 19, n. 6 (2015): 2161–69. http://dx.doi.org/10.2298/tsci130112157r.

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An experimental investigation of the stability limits of biogas in a swirling non-premixed burner has been carried out. A mixture of 60% methane (CH4) and 40% carbon dioxide (CO2) was used to reach the typical biogas composition. Vane swirlers with 30?, 45? and 60? angles were used to make the swirling air. The biogas stability limits and flame behavior under swirling conditions were tested. Besides, effects of air dilution with nitrogen (N2) and CO2 on biogas stability limits were investigated. The results show that using swirl can enhance the flame stability limits approximately four or five times comparing to non-swirling air stream. Adding N2/CO2 to the air had negative effects on the flame stability but no changes were observed in the flame structure. The maximum air dilution was also obtained when 27% and 15% N2 was added to the swirling air under strong and weak swirl, respectively.

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Ge, Bing, Shu Sheng Zang e Pei Qing Guo. "Experimental Study on Flow Structure of Non-Premixed Swirl Burner Flows Using PIV". Advanced Materials Research 347-353 (ottobre 2011): 2587–92. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.2587.

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This paper focuses on investigating the characteristic modes and structures in non-premixed swirling methane/air flames. Using the Particle Image Velocimetry (PIV) technique, the experiment measured the velocity distributions of the swirling flame. Cold flow conditions have been included to provide a picture of the flow field and to demonstrate the modifications induced by combustion. The characteristic lengths, velocity vectors, streamlines, and velocity distributions are presented and discussed. The experiment shows that a large spatial separation at the exit between the central and swirling annular jets can expedite the formation of a recirculation zone. Complex flow structures are found in the recirculation zone. Moreover, the differences between cold swirling flow field and combustion swirling flow are analyzed at length. The data from this experiment is helpful for optimization of the non-premixed burner design, and can be established as benchmarks for the development and validation of combustion numerical simulations.

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29

Shtern, Vladimir, e Fazle Hussain. "Hysteresis in swirling jets". Journal of Fluid Mechanics 309 (25 febbraio 1996): 1–44. http://dx.doi.org/10.1017/s0022112096001541.

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This paper explains hysteretic transitions in swirling jets and models external flows of vortex suction devices. Toward this goal, the steady rotationally symmetric motion of a viscous incompressible fluid above an infinite conical stream surface of a half-angle θc is studied. The flows analysed are generalizations of Long's vortex. They correspond to the conically similar solutions of the Navier-Stokes equations and are characterized by circulation Γc given at the surface and axial flow force J1. Asymptotic analysis and numerical calculations show that four (for θc ≤ 90°) or five (for θc > 90°) solutions exist in some range of Γc and J1.The solution branches form hysteresis loops which are related to jump transitions between various flow regimes. Four kinds of jump are found: (i) vortex breakdown which transforms a near-axis jet into a two-cell flow with a reverse flow near the axis and an annular jet fanning out along conical surface θ = θs < θc (ii) vortex consolidation causing a reversal of (i); (iii) jump flow separation from surface θ = θc and (iv) jump attachment of the swirling jet to the surface. As Γc and/or J1 decrease, the hysteresis loops disappear through a cusp catastrophe. The physical reasons for the solution non-uniqueness are revealed and the results are discussed in the context of vortex breakdown theories. Vortex breakdown is viewed as a fold catastrophe. Two new striking effects are found: (i) there is a pressure peak of O(Γ2c) inside the annular swirling jet; and (ii) a consolidated swirling jet forms with a reversed (‘anti-rocket’) flow force.

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Scherer, Michael A., Karsten Kötter, Mario Markus, Eric Goles e Ingo Rehberg. "Swirling granular solidlike clusters". Physical Review E 61, n. 4 (1 aprile 2000): 4069–77. http://dx.doi.org/10.1103/physreve.61.4069.

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Hart, Juliet E. "Navigating Autism's Swirling Waters". Phi Delta Kappan 94, n. 4 (dicembre 2012): 24–27. http://dx.doi.org/10.1177/003172171209400408.

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Zandbergen, P. J., e D. Dijkstra. "Von Karman Swirling Flows". Annual Review of Fluid Mechanics 19, n. 1 (gennaio 1987): 465–91. http://dx.doi.org/10.1146/annurev.fl.19.010187.002341.

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KURODA, CHIAKI, KOHEI OGAWA e ICHIRO INOUE. "Mixing in swirling jet." Journal of Chemical Engineering of Japan 18, n. 5 (1985): 439–45. http://dx.doi.org/10.1252/jcej.18.439.

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Dutton, J. C. "Swirling supersonic nozzle flow". Journal of Propulsion and Power 3, n. 4 (luglio 1987): 342–49. http://dx.doi.org/10.2514/3.22996.

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Peterson, Ivars. "Swirling Seas, Crystal Balls". Science News 170, n. 17 (21 ottobre 2006): 266. http://dx.doi.org/10.2307/4017499.

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Filip, P., V. Kolář e A. G. Curev. "Complex Swirling Radial Jets". ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 65, n. 9 (1985): 441–46. http://dx.doi.org/10.1002/zamm.19850650917.

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Graham, Dustin M. "New probes SWIRling around". Lab Animal 46, n. 6 (giugno 2017): 229. http://dx.doi.org/10.1038/laban.1290.

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Moore, Guy S. M. "Solution: swirling tea leaves". Physics Education 25, n. 1 (1 gennaio 1990): 59. http://dx.doi.org/10.1088/0031-9120/25/1/515.

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39

Halsey, D. M. "Flowmeters in swirling flows". Journal of Physics E: Scientific Instruments 20, n. 10 (ottobre 1987): 1294. http://dx.doi.org/10.1088/0022-3735/20/10/537.

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40

Halsey, D. M. "Flowmeters in swirling flows". Journal of Physics E: Scientific Instruments 20, n. 8 (agosto 1987): 1036–40. http://dx.doi.org/10.1088/0022-3735/20/8/016.

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41

Candel, Sébastien, Daniel Durox, Thierry Schuller, Jean-François Bourgouin e Jonas P. Moeck. "Dynamics of Swirling Flames". Annual Review of Fluid Mechanics 46, n. 1 (3 gennaio 2014): 147–73. http://dx.doi.org/10.1146/annurev-fluid-010313-141300.

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42

Masson, Vianney, James R. Mathews, Stéphane Moreau, Hélène Posson e Edward J. Brambley. "The impedance boundary condition for acoustics in swirling ducted flow". Journal of Fluid Mechanics 849 (21 giugno 2018): 645–75. http://dx.doi.org/10.1017/jfm.2018.429.

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Abstract (sommario):

The acoustics of a straight annular lined duct containing a swirling mean flow is considered. The classical Ingard–Myers impedance boundary condition is shown not to be correct for swirling flow. By considering behaviour within the thin boundary layers at the duct walls, the correct impedance boundary condition for an infinitely thin boundary layer with swirl is derived, which reduces to the Ingard–Myers condition when the swirl is set to zero. The correct boundary condition contains a spring-like term due to centrifugal acceleration at the walls, and consequently has a different sign at the inner (hub) and outer (tip) walls. Examples are given for mean flows relevant to the interstage region of aeroengines. Surface waves in swirling flows are also considered, and are shown to obey a more complicated dispersion relation than for non-swirling flows. The stability of the surface waves is also investigated, and as in the non-swirling case, one unstable surface wave per wall is found.

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43

Yan, Jie, Nan Gui, Gongnan Xie e Jinsen Gao. "Direct Numerical Simulation and Visualization of Biswirling Jets". Advances in Mechanical Engineering 6 (1 gennaio 2014): 193731. http://dx.doi.org/10.1155/2014/193731.

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Two parallel swirling/rotating jets with a distance between them are termed biswirling jets here, which have important and complicated vortex structures different from the single swirling jet due to the negligible vortex-vortex interactions. The visualization of vortex-vortex interaction between the biswirling jets is accomplished by using direct numerical simulation. The evolution of vortex structures of the biswirling jets is found rather complicated. The turbulent kinetic energy and turbulence dissipation in the central convergence region are augmented locally and rather strongly. The modulation of turbulent kinetic energy by jet-jet interaction upon different scales of vortices is dominated by the swirling levels and the distance between the jets. The turbulent kinetic energy upon intermediate and small scale vortices in bijets with not very high swirling level and at a very close distance is smaller than that in single swirling jets, whereas the opposite is true under a far distance, and so forth.

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44

Ikhlaq, Muhammad, Yasir M. Al-Abdeli e Mehdi Khiadani. "Transient heat transfer characteristics of swirling and non-swirling turbulent impinging jets". Experimental Thermal and Fluid Science 109 (dicembre 2019): 109917. http://dx.doi.org/10.1016/j.expthermflusci.2019.109917.

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45

Jin, Yan, Chen Ye, Xiao Luo, Hui Yuan e Changgui Cheng. "The Model Analysis of Inclusion Moving in the Swirl Flow Zone Sourcing from the Inner-Swirl-Type Turbulence Controller in Tundish". High Temperature Materials and Processes 36, n. 5 (24 maggio 2017): 541–50. http://dx.doi.org/10.1515/htmp-2016-0135.

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AbstractIn order to improve the inclusion removal property of the tundish, the mathematic model for simulation of the flow field sourced from inner-swirl-type turbulence controller (ISTTC) was developed, in which there were six blades arranged with an eccentric angle (θ) counterclockwise. Based on the mathematical and water model, the effect of inclusion removal in the swirling flow field formed by ISTTC was analyzed. It was found that ISTTC had got the better effect of inhibiting turbulence in tundish than traditional turbulence inhibitor (TI). As the blades eccentric angle (θ) of ISTTC increasing, the intensity of swirling flow above it increased. The maximum rotate speed of fluid in swirling flow band driven by ISTTC (θ=45°) was equal to 25 rmp. Based on the force analysis of inclusion in swirling flow sourced from ISTTC, the removal effect of medium size inclusion by ISTTC was attributed to the centripetal force (Fct) of swirling flow, but removal effect of ISTTC to small size inclusion was more depend on its better turbulence depression behavior.

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46

McClusky, Heather L., Mary V. Holloway, Donald E. Beasley e Michael E. Conner. "Development of Swirling Flow in a Rod Bundle Subchannel". Journal of Fluids Engineering 124, n. 3 (19 agosto 2002): 747–55. http://dx.doi.org/10.1115/1.1478066.

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Experimental measurements of the axial development of swirling flow in a rod bundle subchannel are presented. Swirling flow was introduced in the subchannel from a split vane pair located on the downstream edge of the support grid. Particle image velocimetry using an optical borescope yielded full-field lateral velocity data. Lateral flow fields and axial vorticity fields at axial locations ranging from 4.2 to 25.5 hydraulic diameters downstream of the support grid were examined for a Reynolds number of 2.8×104. The lateral velocity fields show that the swirling flow was initially centered in the subchannel. As the flow developed in the axial direction, the swirling flow migrated away from the center of the subchannel. Radial distributions of azimuthal velocity and circulation are presented relative to the centroid of vorticity, and are compared to that of a Lamb-Oseen vortex. The angular momentum decreased as the flow developed in the axial direction. The spatial decay rate of the angular momentum is compared to that of decaying, swirling flow in a pipe.

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47

Talygin, Eugene, e Alexander Gorodkov. "Obtaining Expressions for Time-Dependent Functions That Describe the Unsteady Properties of Swirling Jets of Viscous Fluid". Mathematics 9, n. 16 (5 agosto 2021): 1860. http://dx.doi.org/10.3390/math9161860.

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Previously, it has been shown that the dynamic geometric configuration of the flow channel of the left heart and aorta corresponds to the direction of the streamlines of swirling flow, which can be described using the exact solution of the Navier–Stokes and continuity equations for the class of centripetal swirling viscous fluid flows. In this paper, analytical expressions were obtained. They describe the functions C0(t) and Γ0(t), included in the solutions, for the velocity components of such a flow. These expressions make it possible to relate the values of these functions to dynamic changes in the geometry of the flow channel in which the swirling flow evolves. The obtained expressions allow the reconstruction of the dynamic velocity field of an unsteady potential swirling flow in a flow channel of arbitrary geometry. The proposed approach can be used as a theoretical method for correct numerical modeling of the blood flow in the heart chambers and large arteries, as well as for developing a mathematical model of blood circulation, considering the swirling structure of the blood flow.

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48

Chi, Ai, Cui Zhihua, Feng Fuping, Xu Yifan, Cui Zhiheng e Cui Zhixian. "Study on Mechanism of Shear Swirling Flow Vibration Cementing Improving Displacement Efficiency in Horizontal Well". Open Fuels & Energy Science Journal 8, n. 1 (31 marzo 2015): 58–62. http://dx.doi.org/10.2174/1876973x01508010058.

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When horizontal wells cementing, drilling fluid is easy to be held up at the narrow clearance due to casing eccentricity. At the same time, the density difference makes the lighter drilling fluid gather in the upper portion of borehole. Drilling fluid is hard to be displaced cleanly. Shear swirling flow vibration cementing technique is a new effective cementing technique, which can improve the cementing quality in several ways. On the one hand, shear swirling flow vibration cementing technique makes the annular fluid swirling flow. The circumferential velocity increases a circumferential shear stress for borehole wall, making it easy to carry drilling fluid near the wall and scour mud cake on the wall. Especially for the displacement at narrow clearance caused by the casing eccentricity in horizontal well, the effect will be more obvious. On the other hand, shear swirling flow vibration cementing technique makes the casing string periodically eccentric revolution. It changes the conventional pressure distribution and forms pressure difference on the annular cross section. The pressure at wide clearance is greater than that at narrow clearance, which is advantageous for the fluid flowing from wide clearance to narrow clearance and makes drilling fluid at the narrow clearance displaced effectively. In the paper, it analyzed the mechanism of shear swirling flow vibration cementing improving displacement efficiency from swirling flow and vibration two angles.

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49

Yin, Hong. "Numerical simulation of swirling flow effect on the first stage vane film cooling distribution". International Journal of Modeling, Simulation, and Scientific Computing 07, n. 03 (23 agosto 2016): 1650031. http://dx.doi.org/10.1142/s1793962316500318.

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In advanced gas turbine technology, lean premixed combustion is an effective strategy to reduce peak temperature and thus, NO[Formula: see text] emissions. The swirler is adopted to establish recirculation flow zone, enhancing mixing and stabilizing the flame. Therefore, the swirling flow is dominant in the combustor flow field and has impact on the vane. This paper mainly investigates the swirling flow effect on the turbine first stage vane cooling system by conducting a group of numerical simulations. Firstly, the numerical methods of turbulence modeling using RANS and LES are compared. The computational model of one single swirl flow field is considered. Both the RANS and LES results give reasonable recirculation zone shape. When comparing the velocity distribution, the RANS results generally match the experimental data but fail to at some local area. The LES modeling gives better results and more detailed unsteady flow field. In the second step, the RANS modeling is incorporated to investigate the vane film cooling performance under the swirling inflow boundary condition. According to the numerical results, the leading edge film cooling is largely altered by the swirling flow, especially for the swirl core-leading edge aligned case. Compared to the pressure side, the suction side film cooling is more sensitive to the swirling flow. Locally, the film cooling jet is lifted and turned by the strong swirling flow.

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50

Yakymechko, Ya Ya, e Ya М. Femiak. "The Research of the Swirling Flow of the Power Fluid during its Passing through the Hydrodynamic Cavitator". Prospecting and Development of Oil and Gas Fields, n. 1(74) (31 marzo 2020): 53–71. http://dx.doi.org/10.31471/1993-9973-2020-1(74)-53-71.

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The article presents the theoretical research of the use of swirling flows with reverse jets and with developed precessing vortex core in cavitators and other devices. While describing the motion of the vortex core in the free swirling jet of the fluid it is necessary to take into account that according to the experimental data the vortex core can swirl along the length of the jet and moves around the jet axis in the zone between the area of reverse flows and the boundary outer layer. In this case, it is the vortex core which is under the influence of the basic swirling flow. Herewith, it is necessary to take into account that due to commensurate sizes of the vortex core and the jet, the impact on the core will be different owing to non-uniform distribution of speeds in the jet itself. On the basis of the known formulas, the authors have deduced the improved theoretical dependence of the degree of flow swirl on the flow rate, the vortex core vibration frequency and structural parameters under the conditions of the consistency of swirling flow itself. The theoretical dependence shows that the degree of flow swirl is directly proportional to the precessing vortex core vibration frequency and inversely proportional to the square of mass flow rate. Thus, ensuring the consistency of the swirling flow with varying flow-rate requires the corresponding change of the swirl degree or the influence on the frequency of vibrations of the precessing vortex core. On the basis of the deduced theoretical dependences, the authors have developed and implemented in the computer programs the following calculations: the dependence of the coefficient of the flow swirl on the vortex core vibration frequency; the simulation of the precession of the vortex core in the swirling flow; the research of speed fluctuation in the swirling flow; speed fluctuation during the interaction of swirling jets.

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