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Zeitschriftenartikel zum Thema „Ring-jet structure“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

Zuletzt aktualisiert am 31. Juli 2025

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1

Chen, Fengyang, Ping Lu, Dongqin Li, et al. "The Mixing Character within Oxidation Reactor in Titanium Dioxide Production by Chloride Process." Advances in Engineering Technology Research 1, no. 2 (2022): 48. http://dx.doi.org/10.56028/aetr.1.2.48.

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Chloride process is cost effective and environmental benefit, and the TiCl4 oxidation is the most important stage in this process. The structure of the jet ring has an obviously effect on the mixing of TiCl4 and O2 in the oxidation reactor, which is the key equipment in the production of titanium pigment. In this paper, the gas mixing condition with five jet rings of different structure was simulated and analyzed by computational fluid dynamics (CFD) simulation. The radial concentration distribution of TiCl4 and the non-uniformity of the mixture with different jet rings were obtained. The resu

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Chen, Fengyang, Ping Lu, Dongqin Li, et al. "The Mixing Character within Oxidation Reactor in Titanium Dioxide Production by Chloride Process." Advances in Engineering Technology Research 2, no. 1 (2022): 48. http://dx.doi.org/10.56028/aetr.2.1.48.

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Chloride process is cost effective and environmental benefit, and the TiCl4 oxidation is the most important stage in this process. The structure of the jet ring has an obviously effect on the mixing of TiCl4 and O2 in the oxidation reactor, which is the key equipment in the production of titanium pigment. In this paper, the gas mixing condition with five jet rings of different structure was simulated and analyzed by computational fluid dynamics (CFD) simulation. The radial concentration distribution of TiCl4 and the non-uniformity of the mixture with different jet rings were obtained. The resu

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ŠAJN GORJANC and DOMINIKA GLAŽAR. "The influence of air-jet and vortex yarn on functionality of woven fabric." Industria Textila 69, no. 02 (2018): 87–95. http://dx.doi.org/10.35530/it.069.02.1412.

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The basic intention of the research is to analyse the influence of air-jet and vortex yarn structure on woven fabric functionality. With the research, the air-jet and vortex yarn from the mixture of 65 % PES / 35 % CO fibres and fineness 20 tex were analysed. For comparison, the conventional ring-spun yarn was chosen from the mixture of 65 % PES/35 % CO fibres and fineness 20 tex. The woven fabric in the twill weave T1/3Z was produced from the air-jet, vortex and ring-spun yarn in the weft direction with two different weft densities (20 and 30 yarns per cm). In the first part of the study, the

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Lu, Ru-Sen, Keiichi Asada, Thomas P. Krichbaum, et al. "A ring-like accretion structure in M87 connecting its black hole and jet." Nature 616, no. 7958 (2023): 686–90. http://dx.doi.org/10.1038/s41586-023-05843-w.

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AbstractThe nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation1,2. Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like structure, which was interpreted as gravitationally lensed emission around a central black hole3. Here we report images of M87 obtained in 2018, at a wavelength of 3.5 mm, showing that the compact radio core is spatially resolved. High-resolution imaging shows a ring-like structure of $${8.4}_{-1.1}^{+0.5}$$ 8.4 − 1.1 + 0.5 Schwarzschild radii in diameter, approximately 50% larger than

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HÜSEYİN GAZ, TÜRKSOY, AKKAYA TUĞBA, VURUŞKAN DENİZ, and ÜSTÜNTAĞ SÜMEYYE. "A comparative analysis of air-jet yarn properties with the properties of ring spun yarns." Industria Textila 69, no. 01 (2018): 11–16. http://dx.doi.org/10.35530/it.069.01.1419.

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Ring spinning is the most common method used among the short staple fibers spinning methods. Due to limitations of the production speed in the ring spinning, new spinning methods become more popular with each passing day. Air-jet spinning systems gathered attention with their market share in the new spinning methods. In this study, the properties of the air-jet yarns were comparatively analyzed with the properties of the equivalent Ring yarns, for both single and ply-twisted forms. It was found that the Rieter and Murata air-jet yarns do not show significant differences in terms of physical pr

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Suzuki, Bunji, Hiroshi Kurihara, and Jun-ichi Watanabe. "Detection of C2 Jets of Comet Austin 1989c1." Publications of the Astronomical Society of Japan 42, no. 6 (1991): L93—L97. https://doi.org/10.1093/pasj/42.6.l93.

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Abstract A CCD imaging observation of Comet Austin 1989c1 was carried out with a 60-cm telescope. By applying a ring masking technique to C2 images, we have found jet structures extending to about 30,000 km. Two morphological types of the jet structures were detected: one is a spiral type found in Comet P/Halley; the other is a straight structure in the anti-solar direction. This is the first case of gaseous-jet detection of a new comet in the Oort sense.

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Miyoshi, Makoto, Yoshiaki Kato, and Junichiro Makino. "The Jet and Resolved Features of the Central Supermassive Black Hole of M87 Observed with the Event Horizon Telescope (EHT)." Astrophysical Journal 933, no. 1 (2022): 36. http://dx.doi.org/10.3847/1538-4357/ac6ddb.

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Abstract We report the result of our independent image reconstruction of the M87 from the public data of the Event Horizon Telescope Collaborators (EHTC). Our result is different from the image published by the EHTC. Our analysis shows that (a) the structure at 230 GHz is consistent with those of lower-frequency very long baseline interferometry observations, (b) the jet structure is evident at 230 GHz extending from the core to a few milliarcsecond, although the intensity rapidly decreases along the axis, and (c) the “unresolved core” is resolved into three bright features presumably showing

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VERNET, A., G. A. KOPP, J. A. FERRÉ, and FRANCESC GIRALT. "Three-dimensional structure and momentum transfer in a turbulent cylinder wake." Journal of Fluid Mechanics 394 (September 10, 1999): 303–37. http://dx.doi.org/10.1017/s0022112099005807.

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Simultaneous velocity and temperature measurements were made with rakes of sensors that sliced a slightly heated turbulent wake in the spanwise direction, at different lateral positions 150 diameters downstream of the cylinder. A pattern recognition analysis of hotter-to-colder transitions was performed on temperature data measured at the mean velocity half-width. The velocity data from the different ‘slices’ was then conditionally averaged based on the identified temperature events. This procedure yielded the topology of the average three-dimensional large-scale structure which was visualized

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Longmire, Ellen K., and John K. Eaton. "Structure of a particle-laden round jet." Journal of Fluid Mechanics 236 (March 1992): 217–57. http://dx.doi.org/10.1017/s002211209200140x.

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The interaction of solid particles with the temporal features of a turbulent flow has direct relevance to problems in particle and spray combustion and the processing of particulate solids. The object of the present study was to examine the behaviour of particles in a jet dominated by vortex ring structures. An axisymmetric air jet laden with 55 μm glass particles was forced axially with an acoustic speaker to organize the vortex ring structures rolling up in the free shear layer downstream of the nozzle exit. Visualization studies of forced and unforced flow with Reynolds number of the order

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NOUMI, Yuhei, and Hiroaki HASEGAWA. "Visualization of vortex ring structure in a synthetic jet." Proceedings of the Fluids engineering conference 2018 (2018): OS5–25. http://dx.doi.org/10.1299/jsmefed.2018.os5-25.

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11

Forsting, Thomas, Hannes C. Gottschalk, Beppo Hartwig, Michel Mons, and Martin A. Suhm. "Correcting the record: the dimers and trimers of trans-N-methylacetamide." Physical Chemistry Chemical Physics 19, no. 17 (2017): 10727–37. http://dx.doi.org/10.1039/c6cp07989j.

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12

Miyoshi, Makoto, Yoshiaki Kato, Junichiro Makino, and Masato Tsuboi. "The Jet and Resolved Features of the Central Supermassive Black Hole of M87 Observed with EHT in 2017—Comparison with the GMVA 86 GHz Results." Astrophysical Journal Letters 963, no. 1 (2024): L18. http://dx.doi.org/10.3847/2041-8213/ad250e.

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Abstract M87 is the best target for studying black hole accretion and jet formation. Reanalysis of the Event Horizon Telescope (EHT) public data at 230 GHz shows a core–knots structure at the center and jet features. We here compare this with the new results of GMVA at 86 GHz showing a spatially resolved central core. There are similarities and differences between the two. At 86 GHz, “two bright regions” are seen on the ring in the core. The “core–knot–west knot” triple structure in the 230 GHz image shows apparent appearance of two peaks similar to the “two bright regions” when convolved with

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Alston, Peter V. "Effect of Yarn Spinning System on Pill Resistance of Polyester/Cotton Knit Fabrics." Textile Research Journal 62, no. 2 (1992): 105–8. http://dx.doi.org/10.1177/004051759206200208.

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We have determined the effect of ring, rotor, and air-jet spinning on the pill resistance of jersey and interlock fabrics. The jersey fabrics contained the same polyester type, while the interlock fabrics contained the preferred polyester for each spinning system. In each of the constructions, the air-jet spun fabrics were significantly more pill resistant than ring and rotor spun fabrics. Kinetic studies of the rates of pill formation and wear-off indicate that this difference is due to the much slower formation rate of the air-jet spun fabric. Analysis of pill character suggests that the tig

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Tsai, Feng Chin, and Rong Fung Huang. "Topological Flow Structures of Annular Swirling Jets." Journal of Mechanics 17, no. 3 (2001): 131–38. http://dx.doi.org/10.1017/s1727719100004494.

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AbstractThe effects of blockage and swirl on the macro flow structures of the annular jet past a circular disc are experimentally studied through the time-averaged streamline patterns. In the blockage-effect regime, the flows present multiple modes, single bubble, dual rings, vortex breakdown, and triple rings, in different regimes of blockage ratio and swirl number. The topological models of the flow structures are proposed and discussed according to the measured flow fields to manifest the complex flow structures. The single bubble is a closed recirculation bubble with a stagnation point on

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Britzen, S., M. Zajaček, L. Č. Popović, et al. "A ring accelerator? Unusual jet dynamics in the IceCube candidate PKS 1502+106." Monthly Notices of the Royal Astronomical Society 503, no. 3 (2021): 3145–78. http://dx.doi.org/10.1093/mnras/stab589.

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ABSTRACT On 2019/07/30.86853 ut, IceCube detected a high-energy astrophysical neutrino candidate. The Flat Spectrum Radio Quasar PKS 1502+106 is located within the 50 per cent uncertainty region of the event. Our analysis of 15 GHz Very Long Baseline Array (VLBA) and astrometric 8 GHz VLBA data, in a time span prior and after the IceCube event, reveals evidence for a radio ring structure that develops with time. Several arc-structures evolve perpendicular to the jet ridge line. We find evidence for precession of a curved jet based on kinematic modelling and a periodicity analysis. An outflowin

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Prasetya, Rubby, Akira Sou, Junichi Oki, et al. "Three-dimensional flow structure and string cavitation in a fuel injector and their effects on discharged liquid jet." International Journal of Engine Research 22, no. 1 (2019): 243–56. http://dx.doi.org/10.1177/1468087419835697.

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Two kinds of cavitation may occur in mini-sac type diesel injectors. The first is geometrical cavitation, which can usually be seen as a film-like structure in the nozzle. The second is the filament-like string cavitation. Both types of cavitation are known to affect fuel spray characteristics, although the effects of geometrical cavitation and that of string cavitation have not been individually clarified. Moreover, the mechanism behind string cavitation occurrence is still unclear. String cavitation usually occurs at low needle lift, which might indicate the existence of a vortex ring flow i

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Zhou, Jianhan. "Research on the interaction mechanism of multiple vortices in biological wake flow field." Journal of Physics: Conference Series 2634, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1742-6596/2634/1/012026.

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Abstract The vortex-ring interaction of synchronous jets has been paid more attention by predecessors, while the research of asynchronous jets (i.e. there is a time difference between the start of jets) of parallel dual nozzles has been studied less. Therefore, the interaction between vortex rings and the vortex structure evolution of the dual-nozzle asynchronous jets with different time differences (Δt) is studied in this paper. Numerical results obtained can be divided into four intervals: 1. Synchronous jets (Δt = 0); 2. Critical interval (Δt < 0.1t, where t is the jet time), having simi

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PARK, CHEOL WOO. "INVESTIGATION ON FLOW STRUCTURE BEHIND A RING BY IMPLEMENTING OPTICAL PARTICLE CHARACTERIZATIONS." International Journal of Modern Physics B 20, no. 25n27 (2006): 4511–16. http://dx.doi.org/10.1142/s0217979206041604.

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The flow structure behind circular and elliptical type rings embedded in a cross-flow was investigated experimentally using a particle image velocimetry (PIV), implementing optical particle characterizations. The experiments were performed in a circulating water channel with a test section of 0.2m height × 0.3m width × 1.2m length. The Reynolds number based on the ring hoop cord length is about Re =1200. The velocity fields near the ring hoop were measured using the two-frame cross-correlation PIV method. As a result, the flow near the sharp-edged end of ring hoop ascends fast and showed a con

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Gizani, N. A. B., and J. P. Leahy. "The Environment of Hercules A." Symposium - International Astronomical Union 175 (1996): 351–52. http://dx.doi.org/10.1017/s0074180900081079.

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The bright radio galaxy Hercules A (z = 0.154), has power P178MHz = 8 × 1026 W Hz–1sr–1 and although this puts it well above the FR break, its structure is intermediate between Fanaroff and Riley classes I and II. With a linear size of 334 kpc (for H0 = 100 kms–1Mpc–1), Hercules A possesses an unusual jet-dominated morphology and no compact hotspots. The western jet shows partial or full ring-like features that form a linear sequence heading from the core to the lobes and follow an inner jet.

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YAMADA, Naomi, Fujio AKAGI, Youichi ANDO, and Sumio YAMAGUCHI. "Vortex Ring Structure induced by Pulsatile Jet flow in a Pipe." Proceedings of Conference of Kyushu Branch 2004.57 (2004): 225–26. http://dx.doi.org/10.1299/jsmekyushu.2004.57.225.

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Srinivasan, J., A. K. Sengupta, and V. K. Kothari. "Air-Jet Texturing of Spun Cotton Yarns for Improved Comfort." Textile Research Journal 62, no. 1 (1992): 40–43. http://dx.doi.org/10.1177/004051759206200106.

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We have studied air-jet texturing of spun yarns with different structural configurations. After texturing, the yarns have improved bulk and reduced modulus and flexural rigidity, rendering them more suitable for improved comfort applications. Increased bulk after texturing is accompanied by reduced strength. We have observed that after air-jet texturing, certain structures such as carded ring spun yarns and Siro spun yarns possess a higher level of bulk compared to other structures. Rotor spun yarns have lower bulk after texturing because of their tripartite structure, twist angle variations,

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Weclas, M., and J. Cypris. "Characterization of the distribution-nozzle operation for mixture homogenization by a late-diesel-injection strategy." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 226, no. 4 (2011): 529–46. http://dx.doi.org/10.1177/0954407011420499.

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In order to realize a homogeneous combustion process it is necessary to decouple this combustion process from fuel injection. This homogeneous combustion process requires the charge to be homogeneous prior to simultaneous volumetric ignition. This kind of ignition is a self-ignition process requiring control of the ignition timing. A late-injection strategy as used in a conventional diesel engine permits control of the ignition timing; however, the time available for mixture formation and the homogenization process is very limited. The present paper deals with a distribution-nozzle concept whi

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Ni, Yongyan, Zhongyong Pan, Zhenjie Huang, and Weimin Liu. "Vortex characteristics downstream a fan and its effect on the heat transfer of the temperature inversion under late spring coldness." Advances in Mechanical Engineering 9, no. 7 (2017): 168781401770435. http://dx.doi.org/10.1177/1687814017704353.

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Tea plant in East China usually suffers from frost damage due to sudden low temperature under late spring coldness. A fan is a frost protection device that can blow the warmer air aloft to the tea canopy level under radiative frost meteorological event with temperature inversions. In this study, the flow fields and the temperature distribution downstream a fan were numerically simulated. It is found that the flow structure downstream the fan is divided into two flow regimes: one is the jet flow that blows the warmer air aloft downward and the other one is vortex ring that enhances turbulence a

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Crawley, Michael, Lior Gefen, Ching-Wen Kuo, Mo Samimy, and Roberto Camussi. "Vortex dynamics and sound emission in excited high-speed jets." Journal of Fluid Mechanics 839 (January 29, 2018): 313–47. http://dx.doi.org/10.1017/jfm.2017.906.

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This work aims to study the dynamics of and noise generated by large-scale structures in a Mach 0.9 turbulent jet of Reynolds number $6.2\times 10^{5}$ using plasma-based excitation of shear layer instabilities. The excitation frequency is varied to produce individual or periodic coherent ring vortices in the shear layer. First, two-point cross-correlations are used between the acoustic near field and far field in order to identify the dominant noise source region. The large-scale structure interactions are then investigated by stochastically estimating time-resolved velocity fields using time

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ISHII, R., H. FUJIMOTO, N. HATTA, and Y. UMEDA. "Experimental and numerical analysis of circular pulse jets." Journal of Fluid Mechanics 392 (August 10, 1999): 129–53. http://dx.doi.org/10.1017/s0022112099005303.

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Unsteady circular jets are treated experimentally and numerically. The time evolution of circular pulse jets is investigated systematically for a wide range of jet strength, with the focus on the jet evolution, in particular the formation processes of Mach disks in the middle stage and of shock-cell structures in the later stage. It is shown that unsteady second shocks are realized for all sonic underexpanded jets and they either breed conical shocks for lower pressure ratios or truncated cones (Mach disk and reflected shock) for higher pressure ratios. The vortex ring produced near the nozzle

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York, Carly A., Ian K. Bartol, Paul S. Krueger, and Joseph T. Thompson. "Squids use multiple escape jet patterns throughout ontogeny." Biology Open 9, no. 11 (2020): bio054585. http://dx.doi.org/10.1242/bio.054585.

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ABSTRACTThroughout their lives, squids are both predators and prey for a multitude of animals, many of which are at the top of ocean food webs, making them an integral component of the trophic structure of marine ecosystems. The escape jet, which is produced by the rapid expulsion of water from the mantle cavity through a funnel, is central to a cephalopod's ability to avoid predation throughout its life. Although squid undergo morphological and behavioral changes and experience remarkably different Reynolds number regimes throughout their development, little is known about the dynamics and pr

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HASHIMOTO, Yuta, Tsutomu ISHIDO, and Hiroaki HASEGAWA. "Effect of Pitch Angle of a Synthetic Jet on Vortex Ring Structure." Proceedings of Conference of Kanto Branch 2017.23 (2017): 318. http://dx.doi.org/10.1299/jsmekanto.2017.23.318.

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Li, Chun Qi, Li Jun Yan, Yang Wang, and Jing Tang. "Simulation on the Effects of Misaligned Coupling on the Output Intensity Distribution in Water-Jet Guided Laser." Advanced Materials Research 211-212 (February 2011): 400–405. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.400.

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Water-jet guided laser machining is a kind of material processing technology using water optical waveguide which is formed by coupling a high energy laser beam into variable-length water jet. In order to design the coupling unit and form the effective energy-jet, the research on the distribution of output intensity is beneficial to understand the structure of the coupling unit and improve the coupling efficiency of laser energy. This paper lists the different coupling misalignments in the coupling unit when laser couplings into water-jet. In this paper, the distribution of energy output intens

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Hsiao, Chao-Tsung, A. Jayaprakash, A. Kapahi, J. K. Choi, and Georges L. Chahine. "Modelling of material pitting from cavitation bubble collapse." Journal of Fluid Mechanics 755 (August 14, 2014): 142–75. http://dx.doi.org/10.1017/jfm.2014.394.

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AbstractMaterial pitting from cavitation bubble collapse is investigated numerically including two-way fluid–structure interaction (FSI). A hybrid numerical approach which links an incompressible boundary element method (BEM) solver and a compressible finite difference flow solver is applied to capture non-spherical bubble dynamics efficiently and accurately. The flow codes solve the fluid dynamics while intimately coupling the solution with a finite element structure code to enable simulation of the full FSI. During bubble collapse high impulsive pressures result from the impact of the bubble

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Volodin, L. Y. "Three-color pyrometry study of radiation and gas dynamic processes in a heterogeneous plasma-vortex ring." Journal of Physics: Conference Series 2270, no. 1 (2022): 012058. http://dx.doi.org/10.1088/1742-6596/2270/1/012058.

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Abstract The paper presents the results of a study of a heterogeneous plasma vortex ring using the three-color image pyrometry technique. The vortex ring is formed during deceleration of a supersonic pulsed aluminum plasma jet in atmospheric air. A technique for calibrating a digital camera and a post-processing process for images are proposed that makes it possible to visualize the internal structure of the vortex. As a result of the study, the effect of vortex separation of condensed and gas flow components was experimentally demonstrated.

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Britzen, S., M. Böttcher, E. Kun, et al. "The nuclear jet and core of TXS 0506+056 could be gravitationally lensed." Astronomy & Astrophysics 695 (March 2025): A103. https://doi.org/10.1051/0004-6361/202452530.

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Aims. TXS 0506+056 was the first active galactic nucleus to be identified as a convincing counterpart of an extremely high-energy neutrino, IceCube-170922A. Prior to this, IceCube data revealed evidence of enhanced neutrino activity in 2014–2015 from the direction of the same source. Renewed neutrino activity from TXS 0506+056 was confirmed by Baikal-GVD on April 18, 2021, and another IceCube detection on September 18, 2022. We revisited this blazar to study its evolution in light of the new high-energy data. Methods. We reanalyzed VLBA data observed at 8 GHz between 2010 and 2019, as well as

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NAKAGAWA, Hiroyuki, Yamato OKADA, Masato AKIMOTO, and Motoaki KIMURA. "Investigation of Vortex Ring Structure in Jet Diffusion Using Active and Passive Control." Proceedings of the Fluids engineering conference 2020 (2020): OS03–24. http://dx.doi.org/10.1299/jsmefed.2020.os03-24.

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NOUMI, Yuhei, Yuya YAMASHITA, and Hiroaki HASEGAWA. "Effect of orifice depth on vortex ring structure generated by a synthetic jet." Proceedings of Conference of Kanto Branch 2019.25 (2019): 19B05. http://dx.doi.org/10.1299/jsmekanto.2019.25.19b05.

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Schubert, Andreas, Philipp Steinert, Torsten Schmidt, and Matthias Hackert-Oschätzchen. "Manufacturing of Tribologically Optimized Surfaces for Powertrain Applications." Key Engineering Materials 523-524 (November 2012): 799–804. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.799.

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Among the major interests in powertrain development are the reduction of frictional losses and service life extension from improved wear resistance. Surface finishing and deterministic microstructuring have been shown to be effective methods in improving the tribological properties of sliding contacts such as bearings and cylinder liners. This is due to their acting as micro pressure-chambers and as wear debris traps. In this work, tribometric ring-on-disc tests were performed in order to evaluate the influence of surface structure − namely, the microstructure geometry and layout − on the fric

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Hirotani, Kouichi, Hsien 賢. Shang 尚, Ruben Krasnopolsky, and Kenichi Nishikawa. "R-JET: A Postprocessing Code for Radiative Transport in Relativistic Jets." Astrophysical Journal 984, no. 1 (2025): 16. https://doi.org/10.3847/1538-4357/adbaf2.

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Abstract We describe a postprocessing radiative transport code for computing the spectra, the core shift, and the surface-brightness distribution of special relativistic jets with arbitrary optical thickness. The jet consists of an electron–positron pair plasma and an electron–proton normal plasma. Electrons and positrons are relativistic and composed of thermal and nonthermal components, while protons are nonrelativistic and nonradiating. The fraction of a pair plasma, as well as the fraction of a nonthermal component, can be arbitrarily chosen. Only the synchrotron process is considered for

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Zhong, Ya Hong, Jian Hui Ma, and Ming Jie Xing. "Fiber Configuration of Air Jet Vortex Spinning Yarns." Advanced Materials Research 834-836 (October 2013): 1784–88. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1784.

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In this paper, the spinning process of air jet vortex spinning was described. The structure of air jet vortex spun yarn was studied by means of blending tracer fibers in spinning. Then the yarns were viewed with the optical microscope and SEM etc. The result shows that air jet vortex spun yarn comprises two parts. The outer layer, composed of twisted fibers, presents helical form. And the inner layer contains about 30% fibers untwisted or slackly twisted. The distance between twisted fiber groups is very short, so the borderline isnt obvious. There is a certain angle between core fibers in par

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Grover, Ronald O., Xiaofeng Yang, Scott Parrish, et al. "CFD simulations of electric motor end ring cooling for improved thermal management." Science and Technology for Energy Transition 77 (2022): 17. http://dx.doi.org/10.2516/stet/2022015.

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Proper thermal management of an electric motor for vehicle applications extends its operating range. One cooling approach is to impinge Automatic Transmission Fluid (ATF) onto the rotor end ring. Increased ATF coverage correlates to enhanced heat transfer. Computational Fluid Dynamics (CFD) analytical tools provide a mechanism to assess motor thermal management prior to hardware fabrication. The complexity of the fluid flow (e.g., jet atomization, interface tracking, wall impingement) and heat transfer makes these simulations challenging. Computational costs are high when solving these flows o

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PENG, GAOZHU, NORMAN J. ZABUSKY, and SHUANG ZHANG. "Jet and vortex flows in a shock/ hemispherical-bubble-on-wall configuration." Laser and Particle Beams 21, no. 3 (2003): 449–53. http://dx.doi.org/10.1017/s0263034603213252.

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We suggest an easily obtained laboratory configuration to observe jet and vortex flows for the Richtmyer–Meshkov (accelerated inhomogeneous flow) environment. A hemispherical bubble in air with density ratio of 5 is placed against an ideally reflecting wall and struck by a planar shock. This also models a spherical bubble struck symmetrically by two identical approaching shocks, that is, a “reshock” configuration. For all Mach numbers (M = 1.2, 1.5, and 2.0), our axisymmetric simulations show that the heavy hemispherical bubble expands axially away from the wall as a jet, and a weaker vortex r

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Zhang, Zhenyu, Yehui Hou, Zezhou Hu, Minyong Guo, and Bin Chen. "Polarized images of charged particles in vortical motions around a magnetized Kerr black hole." Journal of Cosmology and Astroparticle Physics 2024, no. 03 (2024): 013. http://dx.doi.org/10.1088/1475-7516/2024/03/013.

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Abstract In this work, we study the images of a Kerr black hole (BH) immersed in uniform magnetic fields, illuminated by the synchrotron radiation of charged particles in the jet. We particularly focus on the spontaneously vortical motions (SVMs) of charged particles in the jet region and investigate the polarized images of electromagnetic radiations from the trajectories along SVMs. We notice that there is a critical value ω_c for charged particle released at a given initial position and subjected an outward force, and once |qB_0/m|=|ω_B|>|ω_c| charged particles can move along SVMs in the

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CITRINITI, J. H., and W. K. GEORGE. "Reconstruction of the global velocity field in the axisymmetric mixing layer utilizing the proper orthogonal decomposition." Journal of Fluid Mechanics 418 (September 10, 2000): 137–66. http://dx.doi.org/10.1017/s0022112000001087.

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Experimental data are presented from 138 synchronized channels of hot-wire anemometry in an investigation of the large-scale, or coherent, structures in a high Reynolds number fully developed, turbulent axisymmetric shear layer. The dynamics of the structures are obtained from instantaneous realizations of the streamwise velocity field in a single plane, x/D = 3, downstream of a round jet nozzle. The Proper Orthogonal Decomposition (POD) technique is applied to an ensemble of these realizations to determine optimal representations of the velocity field, in a mean-square sense, in terms of an o

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López, Juan Carlos, Alberto Macario, Andrés Verde, Alfonso Pérez-Encabo, and Susana Blanco. "Decoding the Structure of Non-Proteinogenic Amino Acids: The Rotational Spectrum of Jet-Cooled Laser-Ablated Thioproline." Molecules 26, no. 24 (2021): 7585. http://dx.doi.org/10.3390/molecules26247585.

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The broadband rotational spectrum of jet-cooled laser-ablated thioproline was recorded. Two conformers of this system were observed and identified with the help of DFT and ab initio computations by comparison of the observed and calculated rotational constants and 14N quadrupole coupling constants as well as the predicted energies compared to the observed relative populations. These conformers showed a mixed bent/twisted arrangement of the five-membered ring similar to that of the related compound thiazolidine with the N–H bond in axial configuration. The most stable form had the COOH group in

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Yang, H., and Y. Zhou. "Axisymmetric jet manipulated using two unsteady minijets." Journal of Fluid Mechanics 808 (November 2, 2016): 362–96. http://dx.doi.org/10.1017/jfm.2016.634.

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The manipulation of a turbulent axisymmetric jet is experimentally investigated based on two unsteady radial minijets. The Reynolds number is 8000. The mass flow rate ratio$C_{m}$of the two minijets to that of the main jet and the ratio$f_{e}/f_{0}^{\prime }$of the excitation frequency$f_{e}$to the preferred-mode frequency$f_{0}^{\prime }$in the natural jet are examined. The decay rate$K$of the jet centreline mean velocity exhibits a strong dependence on$C_{m}$and$f_{e}/f_{0}^{\prime }$and is classified into three distinct categories in terms of required$C_{m}$, achievable enhancement in$K$and

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CHOUTAPALLI, I., A. KROTHAPALLI, and J. H. ARAKERI. "An experimental study of an axisymmetric turbulent pulsed air jet." Journal of Fluid Mechanics 631 (July 17, 2009): 23–63. http://dx.doi.org/10.1017/s0022112009007009.

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An experimental study is carried out to elucidate the structure of a high Reynolds number (~105) turbulent pulsed jet. Particle image velocimetry measurements showed that the near flow field is dominated by a series of vortex rings with jet-like flows in between. The data show that the vortex rings convect at nearly constant speed of 0.6Uj(Uj: mean jet exit velocity) and the spacing between the rings assumes a value of about 0.6/St(St: Strouhal number=fd/Uj, wherefis the pulsing frequency anddis the nozzle exit diameter). With increasing Strouhal number, the rings are closely spaced and the fl

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Zhao, Peng, and Rongxun Piao. "Lattice Boltzmann Method Modeling of the Evolution of Coherent Vortices and Periodic Flow in a Continuous Casting Mold." Metals 12, no. 4 (2022): 572. http://dx.doi.org/10.3390/met12040572.

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Transient phenomena and vortex structures throughout the mold are simulated using a lattice Boltzmann method (LBM) coupled with large eddy simulation (LES) using a free surface model under steady operating conditions. The accuracy of the LBM-LES model has been verified by comparing the simulated velocities with published experimental values. The current work focuses on the evolution of the vortex structure in internal flow inside the submerged entry nozzle (SEN) jet flow and the turbulent flow near the wall of the mold. The results show various types of vortex structures with different directi

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YOSHIDA, Fumiya, Taichi USUZAWA, and Takahiro KIWATA. "S0510402 LES of a Flow Structure for Round Jet with Divergent and Convergent Deflecting Ring." Proceedings of Mechanical Engineering Congress, Japan 2014 (2014): _S0510402——_S0510402—. http://dx.doi.org/10.1299/jsmemecj.2014._s0510402-.

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KOJIMA, Tadatomo, Mari SHIMAZUE, Yoshihiro MATSUOKA, and Jun KUSUI. "Jet Noise Containing Discrete Frequency. 2nd Report. Effect of Structure and Behavior of Vortex Ring." Transactions of the Japan Society of Mechanical Engineers Series B 62, no. 594 (1996): 637–44. http://dx.doi.org/10.1299/kikaib.62.637.

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Rogina-Car, Beti, Zenun Skenderi, and Zlatko Vrljičak. "Thermophysiological wear comfort of viscose and tencel socks." Koža & obuća 68, no. 4 (2020): 22–29. http://dx.doi.org/10.34187/ko.68.4.3.

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Men’s socks were designed and manufactured in multiple plated single jersey structure using 20 tex viscose and Tencel yarn, 156 and 220 dtex multifilament PA 6.6 yarn and 25 tex cotton yarn. Sock mass and sock thickness were determined, the height of the sock leg, the length of the sock foot and half of the leg circumference and half of the foot circumference were measured. Thermophysiological sock wear comfort was determined by measuring thermal resistance on the thermal foot manikin. The results revealed that the sock samples containing the ring spun yarn in the structure had higher thermal

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Sardanashvily, G., and W. Wachowski. "Differential Calculus onN-Graded Manifolds." Journal of Mathematics 2017 (2017): 1–19. http://dx.doi.org/10.1155/2017/8271562.

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The differential calculus, including formalism of linear differential operators and the Chevalley–Eilenberg differential calculus, overN-graded commutative rings and onN-graded manifolds is developed. This is a straightforward generalization of the conventional differential calculus over commutative rings and also is the case of the differential calculus over Grassmann algebras and onZ2-graded manifolds. We follow the notion of anN-graded manifold as a local-ringed space whose body is a smooth manifoldZ. A key point is that the graded derivation module of the structure ring of graded functions

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Cheng, Chin-Hsiang, Yi-Shen Chen, Hsin-Yu Tsai, Yu-Ling Liang, David T. W. Lin, and Yitung Chen. "Development of a Flexible Metamaterial Film with High EM Wave Absorptivity by Numerical and Experimental Methods." Materials 15, no. 12 (2022): 4133. http://dx.doi.org/10.3390/ma15124133.

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The present study is intended to develop and test a cost-effective and efficient printing method for fabricating flexible metamaterial film with high electromagnetic wave absorptivity. The film can be easily applied to the surfaces with curved aspects. Firstly, numerical parametric study of the absorption characteristics of the film is performed for the range of frequency varying from 2.0 to 9.0 GHz based on commercial software package. Secondly, the flexible metamaterial films are fabricated, and experiments are conducted. The flexible metamaterial film consists of a flexible dielectric film

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Blanco, Mónica W., Martín A. Guerrero, Luis F. Miranda, Eric Lagadec, and Olga Suárez. "VISIR-VLT images of the water maser: Emitting planetary nebula K3-35." Proceedings of the International Astronomical Union 7, S283 (2011): 312–13. http://dx.doi.org/10.1017/s1743921312011180.

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AbstractK3-35 is an extremely young bipolar planetary nebula that contains a precessing bipolar jet and a small (radius 80 AU) water maser equatorial ring. We have obtained VISIR-VLT images of K3-35 in the PAH1 (λ=8.6 μm), [S iv] (λ=10.6 μm), and SiC (λ=11.85 μm) filters to analize the mid-IR morphology and the temperature structure of its dust emission. The images show the innermost nebular regions undetected at optical wavelegths and the precessing bipolar jets. The temperature map shows variations in the temperature in the equatorial zone and in regions associated to its jets.

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