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Artykuły w czasopismach na temat „Jet-induced”

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Data publikacji: 6 września 2023

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1

SHIMIZU, Fumio, Kazuhiro TANAKA i Kimishiro TOKUDA. "EXPERIMENTAL STUDY OF SIPHON PHENOMENON INDUCED BY A WATER JET(Water Jet)". Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 333–36. http://dx.doi.org/10.1299/jsmeicjwsf.2005.333.

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2

Harris, David T., Debbie Sakiestewa, Dominic Titone, Raymond F. Robledo, R. Scott Young i Mark Witten. "Jet fuel-induced immunotoxicity". Toxicology and Industrial Health 16, nr 7-8 (sierpień 2000): 261–65. http://dx.doi.org/10.1177/074823370001600702.

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3

van Breugel, Wil, Chris Fragile, Peter Anninos i Stephen Murray. "Jet-Induced Star Formation". Symposium - International Astronomical Union 217 (2004): 472–79. http://dx.doi.org/10.1017/s0074180900198225.

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Jets from radio galaxies can have dramatic effects on the medium through which they propagate. We review observational evidence for jet-induced star formation in low (‘FR-I’) and high (‘FR-II’) luminosity radio galaxies, at low and high redshifts respectively. We then discuss numerical simulations which are aimed to explain a jet-induced starburst (‘Minkowski's Object’) in the nearby FR-I type radio galaxy NGC 541. We conclude that jets can induce star formation in moderately dense (10 cm−3), warm (104 K) gas; that this may be more common in the dense environments of forming, active galaxies; and that this may provide a mechanism for ‘positive’ feedback from AGN in the galaxy formation process.

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4

Williams, Teresa C., Jeffrey P. Kanne i Tasneem A. Lalani. "Jacuzzi jet-induced pneumoperitoneum". Emergency Radiology 10, nr 5 (1.04.2004): 259–61. http://dx.doi.org/10.1007/s10140-004-0330-y.

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5

Razumovskii, N. A. "Induced capillary jet breakdown". Journal of Engineering Physics 60, nr 4 (kwiecień 1991): 419–22. http://dx.doi.org/10.1007/bf00872143.

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6

Milhano, Guilherme, Urs Achim Wiedemann i Korinna Christine Zapp. "Sensitivity of jet substructure to jet-induced medium response". Physics Letters B 779 (kwiecień 2018): 409–13. http://dx.doi.org/10.1016/j.physletb.2018.01.029.

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7

Berk, Tim, i Bharathram Ganapathisubramani. "Effects of vortex-induced velocity on the development of a synthetic jet issuing into a turbulent boundary layer". Journal of Fluid Mechanics 870 (14.05.2019): 651–79. http://dx.doi.org/10.1017/jfm.2019.279.

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A synthetic jet issuing into a cross-flow influences the local velocity of the cross-flow. At the jet exit the jet is oriented in the wall-normal direction while the cross-flow is oriented in the streamwise direction, leading to a momentum transfer between the jet and the cross-flow. Streamwise momentum transferred from the cross-flow to the jet accelerates the pulses created by the jet. This momentum transfer continuous up to some point downstream where these pulses have the same velocity as the surrounding flow and are no longer blocking the cross-flow. The momentum transfer from the cross-flow to the jet leads to a momentum deficit in the cross-flow far downstream of the viscous near field of the jet. In the literature this momentum-flux deficit is often attributed to viscous blockage or to up-wash of low-momentum fluid. The present paper proposes and quantifies a third source of momentum deficit: a velocity induced opposite to the cross-flow by the vortical structures created by the synthetic jet. These vortical structures are reconstructed from measured data and their induced velocity is calculated using the Biot–Savart law. The three-dimensional three-component induced velocity fields show great similarity to the measured velocity fields, suggesting that this induced velocity is the main contributor to the velocity field around the synthetic jet and viscous effects have only a small influence. The momentum-flux deficit induced by the vortical structures is compared to the measured momentum-flux deficit, showing that the main part of this deficit is caused by the induced velocity. Variations with Strouhal number (frequency of the jet) and velocity ratio (velocity of the jet) are observed and discussed. An inviscid-flow model is developed, which represents the downstream evolution of the jet in cross-flow. Using the measured data as an input, this model is able to predict the deformation, (wall-normal) evolution and qualitative velocity field of the jet. The present study presents evidence that the velocity induced by the vortical structures forming a synthetic jet plays an important role in the development of and the velocity field around the jet.

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8

Mendoza, S., i M. S. Longair. "Deflection of jets induced by jet-cloud and jet-galaxy interactions". Monthly Notices of the Royal Astronomical Society 324, nr 1 (1.06.2001): 149–55. http://dx.doi.org/10.1046/j.1365-8711.2001.04271.x.

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9

Hong, Jian-Hao, Yee-Meng Chiew, Shih-Chun Hsieh, Nian-Sheng Cheng i Po-Hung Yeh. "Propeller Jet–Induced Suspended-Sediment Concentration". Journal of Hydraulic Engineering 142, nr 4 (kwiecień 2016): 04015064. http://dx.doi.org/10.1061/(asce)hy.1943-7900.0001103.

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10

Nakagawa, Atsuhiro, Takayuki Hirano, Makoto Komatsu, Hiroshi Uenohara, Yasuko Yoshida, Reizo Shirane, Kazuyoshi Takayama i Takashi Yoshimoto. "402 Laser-induced liquid jet knife". Proceedings of the Fluids engineering conference 2001 (2001): 42. http://dx.doi.org/10.1299/jsmefed.2001.42.

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11

Butt, Yousaf M., Thomas J. Maccarone i Nikos Prantzos. "Jet‐induced Nucleosynthesis in Misaligned Microquasars". Astrophysical Journal 587, nr 2 (20.04.2003): 748–53. http://dx.doi.org/10.1086/368301.

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12

Huang, Yang, Lijun Lu, Zhiran Yi, Guosheng Hu, Yueqi Zhai, Jingquan Liu, Wenming Zhang i Bin Yang. "Aeroacoustics-driven jet-stream wind energy harvester induced by jet-edge-resonator". Nano Energy 89 (listopad 2021): 106441. http://dx.doi.org/10.1016/j.nanoen.2021.106441.

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13

Maletić, Dejan, Dean Popović, Nevena Puač, Zoran Lj Petrović i Slobodan Milošević. "Comparison of laser induced breakdown spectroscopy and fast ICCD imaging for spatial and time resolved measurements of atmospheric pressure helium plasma jet". Plasma Sources Science and Technology 31, nr 2 (1.02.2022): 025011. http://dx.doi.org/10.1088/1361-6595/ac4ddd.

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Abstract In this paper we compared the fast Intensified Charge Coupled Device (ICCD) imaging with the newly developed diagnostic method that utilizes laser induced breakdown in plasma jet. Our helium plasma jet was powered by an 80 kHz high-voltage sine wave and propagated into the ambient air. Pulsed laser beam 1064 nm (4 ns pulse duration and 5 Hz repetition rate) was focused with the lens into the plasma jet at energy below breakdown threshold in helium. Laser pulses and the jet powering signal were synchronized. Laser induced plasma is highly dependent on the concentration of seed electrons and other charged particles in the plasma jet channel. We compared the radial profiles of the plasma jet obtained with these two methods. For laser induced breakdown it was ±0.5 mm and for ICCD measurement it was ±1.75 mm, while the ionization wave velocities obtained with these two methods were 15 km s−1 and 20 km s−1 respectively. Electrical characteristics of the plasma jet were also presented and one can see a large hysteresis effect when the applied power to the plasma jet was reducing. We show that the laser induced breakdown spectroscopy can be used as a complementary diagnostics technique with ICCD measurements.

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14

Zhang, Yaou, Qiang Gao, Xiangjun Yang, Qian Zheng i Wansheng Zhao. "Research on Electrostatic Field-Induced Discharge Energy in Conventional Micro EDM". Materials 16, nr 11 (25.05.2023): 3963. http://dx.doi.org/10.3390/ma16113963.

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The electrostatic field-induced electrolyte jet (E-Jet) electric discharge machining (EDM) is a newly developed micro machining method. However, the strong coupling of the electrolyte jet liquid electrode and the electrostatic induced energy prohibited it from utilization in conventional EDM process. In this study, the method with two discharge devices connecting in serials is proposed to decouple pulse energy from the E-Jet EDM process. By automatic breakdown between the E-Jet tip and the auxiliary electrode in the first device, the pulsed discharge between the solid electrode and the solid workpiece in the second device can be generated. With this method, the induced charges on the E-Jet tip can indirectly regulate the discharge between the solid electrodes, giving a new pulse discharge energy generation method for traditional micro EDM. The pulsed variation of current and voltage generated during the discharge process in conventional EDM process verified the feasibility of this decoupling approach. The influence of the distance between the jet tip and the electrode, as well as the gap between the solid electrode and the work-piece, on the pulsed energy, demonstrates that the gap servo control method is applicable. Experiments with single points and grooves indicate the machining ability of this new energy generation method.

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15

Cai, Shuxiang, Yalin Sun, Zhen Wang, Wenguang Yang, Xiangyu Li i Haibo Yu. "Mechanisms, influencing factors, and applications of electrohydrodynamic jet printing". Nanotechnology Reviews 10, nr 1 (1.01.2021): 1046–78. http://dx.doi.org/10.1515/ntrev-2021-0073.

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Abstract E-jet printing is a micro- and nano-manufacturing technique that utilizes electric field-induced fluid jet printing for achieving better control and resolution than traditional jet printing processes. In addition to high printing resolution, E-jet printing has advantages in some aspects such as wide material applicability, which has been successfully applied in numerous applications that include sensors, transistors, tissue engineering scaffolds, and photonic devices. This article reviews the electrohydrodynamic jet (E-jet) printing technology, which mainly relies on the principle of electrohydrodynamic-induced fluid movement. At the same time, the process of jet formation and droplet deposition is described. The parameters, nozzle design, and ink characteristics of the jet printing process are summarized. Then, a number of concrete applications based on E-jet printing processes are described in this article. Finally, the future development of this technology has been prospected.

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16

LUO, ZHEN-BING, i ZHI-XUN XIA. "THE MECHANISM OF JET VECTORING USING SYNTHETIC JET ACTUATORS". Modern Physics Letters B 19, nr 28n29 (20.12.2005): 1619–22. http://dx.doi.org/10.1142/s0217984905010050.

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The control mechanism of jet vectoring using synthetic jet actuators is investigated. The final deflection angle of the primary jet is a result of the primary jet controlled by synthetic jets at three different regions. The lower static pressure near the primary jet exit induced by the synthetic jet, the entrainment and absorption of the primary jet fluid by the synthetic jet during the blowing and the suction stroke, the coupling and interaction between the vortices of synthetic jet and the shear layer of the primary jet are the main control mechanisms for the synthetic jet actuator vectoring a primary jet. The main factors influencing jet vectoring are analyzed and summarized, and a preparatory model for jet vectoring using synthetic jet actuator is presented.

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17

Luo, Shi-Jie, Yao-Feng Liu i Yu-Wei Liu. "Visualization of asymmetric separation induced by lateral jet interaction on a slender body in supersonic flow". International Journal of Modern Physics B 34, nr 14n16 (20.04.2020): 2040081. http://dx.doi.org/10.1142/s0217979220400810.

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The lateral jet interaction on a slender body in supersonic flow was investigated by numerical simulation. The spatial and surface flow characteristics induced by jet interaction were shown. As a result, when the lateral jet is not in the longitudinal symmetry plane, the jet interaction causes asymmetric separation flow of surface and space, and destroys the pressure distributions of the slender body. With different angle of attack and circumferential positions of jet, the flow characteristic of the after body for jet in asymmetry plane changes greatly. The results with and without jet interaction also show that the far-field interaction played a major role in the lateral jet interaction.

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18

Chen, Yiyang, Hao Ding, Ziwen Wang, Jianxin Li i Jiahuan Cui. "Experimental PIV investigation of the PZT fans array coupling effect at high Reynolds numbers". Journal of Physics: Conference Series 2108, nr 1 (1.11.2021): 012010. http://dx.doi.org/10.1088/1742-6596/2108/1/012010.

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Abstract Piezoelectric fan arrays are being increasingly emphasized for heat dissipation in small-sized electronic devices. In this study, PIV experiments were conducted to investigate the flow fields induced by piezoelectric fan arrays with different vibration modes and pitches at high Reynolds numbers (324< Re <509) in a stationary air environment. As a result, when the PZT fan array is vibrating in-phase, the saddle points in the time averaged flow field are formed and separated gradually as the pitch increases, the remnant vortex and the induced vortex interact to form a jet with a periodic oscillation in the direction. Jet velocity reaches a maximum at P = 3A. In counter-phase vibration, saddle points are separated from one region under large pitches, the interaction of counter-rotating induced vortices forms a vertical upward jet. The morphology of induced and remnant vortices with different vibration modes and array pitches are responsible for the jet formation and flow field pattern. The interaction of counter-rotating vortices in counter-phase vibration leads the jet intensity higher than in-phase vibration induced jet, the optimal setting of the PZT fan under this study is determined as P = 2.5A with counter-phase vibration. The experimental results provide validation for the simulation study and give guidance to the application

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19

Lee, H., i Y. B. Chang. "Flow-Induced Vibration of Rod Arrays in a Jet Flow". Journal of Pressure Vessel Technology 112, nr 1 (1.02.1990): 46–49. http://dx.doi.org/10.1115/1.2928585.

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Flow-induced vibration of rod arrays in a jet flow was studied experimentally. The rod arrays tested were on square layout with a pitch-to-diameter ratio of 1.32. The rods were found to vibrate with large whirling trajectories when the jet velocity exceeds a critical value. The effects of axial flow velocity and stand-off distance of the rod array from jet exit were also investigated. A design guide for rod arrays subjected to a jet flow is proposed.

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20

SAEKI, SOUICHI, HARUKI MADARAME i KOJI OKAMOTO. "Self-induced sloshing excited by a horizontally injected plane jet". Journal of Fluid Mechanics 448 (26.11.2001): 81–114. http://dx.doi.org/10.1017/s0022112001004153.

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A self-induced free-surface oscillation termed ‘self-induced sloshing’ was observed in a rectangular tank with a submerged and horizontally injected water jet. Self-induced sloshing is excited by the flow itself without any external force. Its behaviour was examined by experiment. The dominant frequency was found to be close to the first or second eigenvalue of fluid in a tank. The conditions of sloshing excitation were obtained for four tank geometries. They were called the ‘sloshing condition’, and defined in terms of inlet velocity and water level. Sloshing conditions were found to be strongly dependent on inlet velocity and tank geometry. A two-dimensional numerical simulation code was developed to simulate self-induced sloshing. The code was based on the boundary-fitted coordinate (BFC) method with height function. The numerical results were qualitatively verified by the experimental results, and were found to correlate well in terms of flow pattern, free-surface shape and sloshing conditions. In this study, sloshing growth was evaluated quantitatively using the simulation results. Oscillation energy supplied for the sloshing motion during a sloshing period (Econ) was calculated from simulation results. Sloshing growth was found to be strongly related to the sign and magnitude of Econ. The distribution of Econ showed that jet flow had a strong correlation with the sloshing growth. It was clarified that sloshing growth was primarily dependent on the spatial phase state of jet fluctuation. A governing parameter of self-induced sloshing, the modified Strouhal number Sts, was proposed on the basis of numerical evaluations of oscillation energy. The value of Sts suggests that one or two large vortices generated by jet fluctuations exist between the inlet and outlet during a sloshing period. When Sts is approximately either 1 (first stage) or 2 (second stage), self-induced sloshing occurs consistently in all experimental cases. The dependence of sloshing on inlet velocity, water level and tank geometry was revealed using Sts. For several tank geometries, a sloshing mode shift or jet mode (stage) transition was found to occur due to changes in inlet jet velocity. The combination of sloshing mode and jet stage can determine the state of the self-induced sloshing. As a result of this study, we propose a new excitation mechanism of self-induced sloshing, represented by a simple feedback loop closed by sloshing motion and jet fluctuation. The overall physical oscillation mechanism of self-induced sloshing was clarified using this feedback loop.

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21

Matsumoto, Jin, i Youhei Masada. "Propagation, cocoon formation, and resultant destabilization of relativistic jets". Monthly Notices of the Royal Astronomical Society 490, nr 3 (23.10.2019): 4271–80. http://dx.doi.org/10.1093/mnras/stz2821.

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ABSTRACT A cocoon is a by-product of a propagating jet that results from shock heating at the jet head. Herein, considering simultaneous cocoon formation, we study the stability of relativistic jets propagating through the uniform ambient medium. Using a simple analytic argument, we demonstrate that independent from the jet launching condition, the effective inertia of the jet is larger than that of the cocoon when the fully relativistic jet oscillates radially owing to the pressure mismatch between jet and cocoon. In such situations, it is expected that the onset condition for the oscillation-induced Rayleigh–Taylor instability is satisfied at the jet interface, resulting in the destabilization of the relativistic jet during its propagation. We have quantitatively verified and confirmed our prior expectation by performing relativistic hydrodynamic simulations in three dimensions. The possible occurrences of the Richtmyer–Meshkov instability, oscillation-induced centrifugal instability, and Kelvin–Helmholtz instability are also discussed.

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22

Wen, Wei, i Xiaoru Zhang. "Laser Beam Quality of Airy Beam in the Jet Engine Exhaust Induced Turbulence". Atmosphere 14, nr 9 (31.08.2023): 1374. http://dx.doi.org/10.3390/atmos14091374.

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Theoretical predictions of laser beam interactions with jet-engine-exhaust-induced turbulence are of importance for optimization of various optical systems, including LIDARs and airborne laser measurement systems. This paper is based on the extended Huygens–Fresnel diffraction integral and the Wigner distribution function, combined with the recently proposed power spectral density function of atmospheric turbulence induced by jet engine exhaust, to derive the formula for the quality factor of a partially coherent Airy beam in turbulent media induced by jet engine exhaust. Numerical calculations based on the analytical formula show that the smaller the structure constant and outer scale of the atmospheric turbulence induced by jet engine exhaust, the smaller the quality factor of a partially coherent Airy beam, indicating better laser beam quality. At the same time, the larger the generalized parameter and inner scale of the jet-engine-exhaust-induced turbulence and the longer the wavelength of the laser beam, the smaller the corresponding quality factor. The numerical results also show that reducing the coherence length of a partially coherent Airy beam and increasing its characteristic width are beneficial for reducing the quality factor in the atmospheric turbulence induced by jet engines. However, the numerical results show that increasing the coherence length of a partially coherent Airy beam and reducing its characteristic width are beneficial for reducing the quality factor in vacuum. This situation demonstrates significant differences between the interaction mechanisms of an Airy beam in vacuum and in the jet-engine-exhaust-induced turbulence. The results of our discussion contribute to clarifying the mechanism of interaction between an Airy laser beam and random media, as well as the application of a curved Airy laser beam in practical situations.

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23

Song, Xiaozong, Shundong Ge, Yanjiang Niu i Dengwei Yan. "Effect of external electric field on ultraviolet-induced nanoparticle colloid jet machining". Nanotechnology 33, nr 21 (4.03.2022): 215302. http://dx.doi.org/10.1088/1361-6528/ac55d0.

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Abstract Electric field enhanced ultraviolet (UV)-induced nanoparticle colloid jet machining is proposed to improve the material removal efficiency of UV-induced nanoparticle colloid jet machining by applying an external electric field. The influences of TiO2 nanoparticle concentration, applied electric field voltage and pH value for the photocatalytic activity of the polishing slurry was investigated by orthogonal experiments. Terephthalic acid (TPA) was used as a fluorescent molecular probe to reflect the relative concentration of hydroxyl radical groups (·OH) in polishing slurry, which directly affects the material removal rate in the UV-induced nanoparticle colloid jet machining process. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and x-ray photoelectron spectroscopy (XPS) were employed to inspect the interaction variations between the TiO2 nanoparticles and the SiC workpiece surface. The SEM and XPS results exhibit that the external electric field can enhance the adsorption of TiO2 nanoparticles on the SiC workpiece surface, which can create more interfacial reaction active centers in the polishing process. The FT-IR spectra results indicate that TiO2 nanoparticles were chemically bonded to the SiC surface by oxygen-bridging atoms in Ti–O–Si bonds. The results of fixed-point polishing experiment show that due to the enhancement effect of external electric field on the photocatalytic activity of the polishing slurry, the material removal efficiency of electric field enhanced UV-induced nanoparticle colloid jet machining is 15% higher than that of UV-induced nanoparticle colloid jet machining, and is 28% higher than that of pure nanoparticle colloid jet machining. Atomic force microscope micromorphology show that an ultra-smooth SiC workpieces with surface roughness of Rms 0.84 nm (Ra 0.474 nm) has been obtained by electric field enhanced UV-induced nanoparticle colloid jet machining.

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24

Vasheghani Farahani, S., i S. M. Hejazi. "Coronal Jet Collimation by Nonlinear Induced Flows". Astrophysical Journal 844, nr 2 (2.08.2017): 148. http://dx.doi.org/10.3847/1538-4357/aa7da5.

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V., Kotlovich. "Induced velocities outside the ideal propeller jet". Transactions of the Krylov State Research Centre 3, nr 397 (6.08.2021): 33–44. http://dx.doi.org/10.24937/2542-2324-2021-3-397-33-44.

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Object and purpose of research. The paper is devoted to the analysis of induced flow velocities outside the ideal propeller jet. The purpose is to widen capabilities of estimations. Materials and methods. Analysis of data on this issue has shown that complicated and quite labor-consuming methods are used for these purposes. It is attempted to devise a calculation scheme based on direct determination of induced velocities from discrete sinks simulating the ideal propeller. For this purpose an algorithm and software is developed for PC implementation. Testing of the computer program allowed us to define conditions ensuring the accuracy of calculations, it confirmed practically full agreement with the data obtained by other authors and possibility for widening the range of its application. Main results. Systematic calculations of induced velocities outside the ideal propeller jet were done allowing us to determine the flow velocity at any point of a wide area for engineering purposes. Conclusion. Longitudinal and radial component velocities induced by ideal propeller outside its jet were calculated based on directly assessed influence of the system of sinks distributed over the propeller disk on the ideal fluid flow. The algorithm for calculations was developed, the software was written and tested. Systematic calculations of induced velocities were done, which could be used for practical estimations.

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NAKAGAWA, Astuhiro, Takayuki HIRANO, Makoto KOMATSU, Hiroshi UENOHARA, Yasuko YOSHIDA, Reizo SHIRANE, Kazuyoshi TAKAYAMA i Takashi YOSHIMOTO. "1B51 Ho: YAG laser-induced liquid jet". Proceedings of the JSME Bioengineering Conference and Seminar 2001.12 (2001): 75–76. http://dx.doi.org/10.1299/jsmebs.2001.12.0_75.

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Mould, Jeremy R., Alex Ridgewell, John S. Gallagher III, Michael S. Bessell, Stefan Keller, Daniela Calzetti, John T. Clarke i in. "Jet‐induced Star Formation in Centaurus A". Astrophysical Journal 536, nr 1 (10.06.2000): 266–76. http://dx.doi.org/10.1086/308927.

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BABA, Masanori, Haruki MADARAME i Koji OKAMOTO. "Self-Induced Sloshing Caused by Plunging Jet." Transactions of the Japan Society of Mechanical Engineers Series B 65, nr 635 (1999): 2278–85. http://dx.doi.org/10.1299/kikaib.65.2278.

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Mirabel, I. F., S. Chaty, L. F. Rodríguez i M. Sauvage. "Jet-induced star formation by a microquasar". Proceedings of the International Astronomical Union 10, S313 (wrzesień 2014): 370–73. http://dx.doi.org/10.1017/s1743921315002501.

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AbstractTheoretical and observational work show that jets from AGN can trigger star formation. However, in the Milky Way the first -and so far- only clear case of relativistic jets inducing star formation has been found in the surroundings of the microquasar GRS 1915+105. Here we summarize the multiwavelength observations of two compact star formation IRAS sources axisymmetrically located and aligned with the position angle of the sub-arcsec relativistic jets from the stellar black hole binary GRS 1915+105 (Mirabel & Rodríguez 1994). The observations of these two star forming regions at centimeter (Mirabel & Rodríguez 1998), millimeter and infrared (Chaty et al. 2001) wavelengths had suggested -despite the large uncertainties in the distances a decade ago- that the jets from GRS 1915+105 are triggering along the radio jet axis the formation of massive stars in a radio lobe of bow shock structure. Recently, Reid et al. (2014) found that the jet source and the IRAS sources are at the same distance, enhancing the evidence for the physical association between the jets from GRS 1915+105 and star formation in the IRAS sources. We conclude that as jets from AGN, jets from microquasars can trigger the formation of massive stars, but at distances of a few tens of parsecs. Although star formation induced by microquasar jets may not be statistically significant in the Milky Way, jets from stellar black holes may have been important to trigger star formation during the re-ionization epoch of the universe (Mirabel et al. 2011). Because of the relative proximity of GRS 1915+105 and the associated star forming regions, they may serve as a nearby laboratory to gain insight into the physics of jet-trigger star formation elsewhere in the universe.

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30

Tywoniuk, Konrad, i Yacine Mehtar-Tani. "Measuring medium-induced gluons via jet grooming". Nuclear Physics A 967 (listopad 2017): 520–23. http://dx.doi.org/10.1016/j.nuclphysa.2017.05.067.

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Lee, Joseph H. W., i C. W. Li. "Experimental Measurements of Multiple‐Jet Induced Flow". Journal of Engineering Mechanics 111, nr 8 (sierpień 1985): 1087–92. http://dx.doi.org/10.1061/(asce)0733-9399(1985)111:8(1087).

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Tan, Remziye İlayda, i Yalçın Yüksel. "Seabed scour induced by a propeller jet". Ocean Engineering 160 (lipiec 2018): 132–42. http://dx.doi.org/10.1016/j.oceaneng.2018.04.076.

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Ottinger, Ch, A. F. Vilesov i T. Winkler. "Laser-induced phosphorescence of jet-cooled pyrimidine". Chemical Physics Letters 208, nr 3-4 (czerwiec 1993): 299–306. http://dx.doi.org/10.1016/0009-2614(93)89079-w.

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Khokhlov, A. M., P. A. Höflich, E. S. Oran, J. C. Wheeler, L. Wang i A. Yu Chtchelkanova. "Jet-induced Explosions of Core Collapse Supernovae". Astrophysical Journal 524, nr 2 (20.10.1999): L107—L110. http://dx.doi.org/10.1086/312305.

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Klein, P., i A. M. Treguier. "Inertial Resonance Induced by an Oceanic Jet". Journal of Physical Oceanography 23, nr 9 (wrzesień 1993): 1897–915. http://dx.doi.org/10.1175/1520-0485(1993)023<1897:iribao>2.0.co;2.

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Pan, Jiaying, Yu He, Tao Li, Haiqiao Wei, Lei Wang i Gequn Shu. "Effect of Temperature Conditions on Flame Evolutions of Turbulent Jet Ignition". Energies 14, nr 8 (16.04.2021): 2226. http://dx.doi.org/10.3390/en14082226.

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Turbulent jet ignition technology can significantly improve lean combustion stability and suppress engine knocking. However, the narrow jet channel between the pre-chamber and the main chamber leads to some difficulties in heat exchange, which significantly affects combustion performance and mechanical component lifetime. To clarify the effect of temperature conditions on combustion evolutions of turbulent jet ignition, direct numerical simulations with detailed chemical kinetics were employed under engine-relevant conditions. The flame propagation in the pre-chamber and the early-stage turbulent jet ignition in the main chamber were investigated. The results show that depending on temperature conditions, two types of flame configuration can be identified in the main chamber, i.e., the normal turbulent jet flame propagation and the spherical flame propagation, and the latter is closely associated with pressure wave disturbance. Under low-temperature conditions, the cold jet stoichiometric mixtures and the vortexes induced by the jet flow determine the early-stage flame development in the main chamber. Under intermediate temperature conditions, pre-flame heat release and leading pressure waves are induced in the jet channel, which can be regarded as a transition of different combustion modes. Whereas under high-temperature conditions, irregular auto-ignition events start to occur, and spherical flame fronts are induced in the main chamber, behaving faster flame propagation.

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37

Iida, Masao, Haruki Madarame, Koji Okamoto i Masashi Fukaya. "Jet-Flutter: Self-Induced Oscillation of Upward Plane Jet Impinging on Free Surface." Transactions of the Japan Society of Mechanical Engineers Series B 61, nr 582 (1995): 517–23. http://dx.doi.org/10.1299/kikaib.61.517.

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Soyama, Hitoshi. "Introduction of Compressive Residual Stress Using a Cavitating Jet in Air". Journal of Engineering Materials and Technology 126, nr 1 (1.01.2004): 123–28. http://dx.doi.org/10.1115/1.1631434.

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Cavitation impact from a cavitation jet, which is formed from bubbles induced by a high-speed water jet in water, can be used for surface modification in a similar manner to shot peening. A cavitating jet is normally produced by injecting a high-speed water jet into a water-filled chamber. It is possible to make a cavitating jet in air by injecting a high-speed water jet into a concentric low-speed water jet that surrounds the high-speed jet. In order to demonstrate this, a high-speed water jet with a concentric low-speed water jet was impacted onto an aluminum specimen to observe the pattern of erosion. The mass loss of the specimen was weighed to measure the capability of the jet, since a more powerful jet produces a larger mass loss. It was shown that the combination of high- and concentric low-speed water jets produced a typical erosion pattern such as that obtained using a cavitating jet in a water-filled chamber. When the injection pressure of the concentric low-speed water jet was optimized, the capability of the cavitating jet in air was much greater than that of a cavitating jet in a water-filled chamber. It was demonstrated that an optimized cavitating jet in air introduced more compressive residual stress in the surface of tool steel alloy than that from a cavitating jet in a water-filled chamber. In addition, this stress was larger than that induced by shot peening. The peened surface was also less rough compared with shot peening.

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Madadnia, J., Dinesh K. Shanmugam, Thai Nguyen i Jun Wang. "A Study of Cavitation Induced Surface Erosion in Abrasive Waterjet Cutting Systems". Advanced Materials Research 53-54 (lipiec 2008): 357–62. http://dx.doi.org/10.4028/www.scientific.net/amr.53-54.357.

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Current jet cutting systems experience severe nozzle erosion and associated maintenance and downtime costs. An experimental investigation was conducted to qualitatively and quantitatively analyse the generation of cavitation in a high pressure water jet cutting system, and to characterise cavitation induced accelerated surface erosion by slurries. The analysis of surface morphology indicates that the shearing induced by cavitation played a major role in the erosion process. The results promise a feasible solution to reduce nozzle wear, and to enhance material removal in the jet cutting process.

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40

Hearn, CJ, JR Hunter, J. Imberger i Senden D. Van. "Tidally induced jet in Koombana Bay, Western Australia". Marine and Freshwater Research 36, nr 4 (1985): 453. http://dx.doi.org/10.1071/mf9850453.

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A study is made of a coastal tidal jet, based on a field program together with numerical and analytical modelling of the tidal discharge and jet dynamics. A new criterion is demonstrated for bottom attachment of low-aspect-ratio buoyant jets. The slightly buoyant jet is attached to the seabed over the initial 2 km of its trajectory, which lies in shallow coastal waters of less than 10 m depth. The jet is about 200 m in width and so its ratio of depth to half-width (aspect ratio) is much lower than for previously reported bottom-attached jets. The longitudinal retardation of the axial speed of the jet is due to bottom friction and entrainment. The jet widens only slowly with distance along its trajectory because entrainment is limited to its sides and is compensated by bathymetric deepening. The jet attaches to the coastline by turning, without loss of speed, to move parallel to the shore. The coastal attachment width is found to be a simple function of the ratio of the jet discharge velocity to the speed of the prevailing alongshore current.

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Zhang, Dongdong, Peng Cui, Jianguo Tan, Xiao Yao, Yao Liu i Jie Song. "Characteristics of enhanced mixing induced by plate jet actuation in supersonic flow". Physics of Fluids 34, nr 4 (kwiecień 2022): 046112. http://dx.doi.org/10.1063/5.0086492.

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The fast and efficient mixing of fuel and oxidizers under supersonic conditions is of great importance for improving the performance of scramjet engines. The mixing process in the inner flow of a scramjet combustor is heavily inhibited by compressibility effects. In this paper, the novel strategy of plate jet actuation is proposed, and its effects on mixing augmentation are analyzed by employing numerical programs developed in-house. The fine vortex structures induced by the plate jet actuation are well captured, and the dynamic behaviors of newly observed T-shaped structures are analyzed in detail. It is found that in plate jet actuation flow, Kelvin–Helmholtz (K–H) vortices induced by K–H instability coexist with T-shaped structures induced by jet actuation instability. The interaction of adjacent T-shaped structures leads to the distortion and breakup of large-scale structures, which can obviously improve the interfaces of upper and lower streams. The distribution of the turbulence intensity along the streamwise direction suggests that with the introduction of plate jet actuation, more intense fluctuations occur in the flow. The growth process of mixing layer thickness indicates that with plate jet actuation, a sharp increase in mixing thickness can be achieved in the near flow field. The results of structural topology analysis show that upper plate jet actuation can produce structures with larger sizes, and the distortion and penetration process of these structures can entrain more upper and lower streams into the mixing region. It is suggested that the present proposed strategy is a good candidate for mixing enhancement with the application of scramjet combustors.

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Gnanamoorthy, R., i A. Sahaya Grinspan. "Surface Modification of Steel Using Liquid Jet Peening (Fatigue Performance)". Materials Science Forum 539-543 (marzec 2007): 1140–45. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.1140.

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Oil jet peening is a surface modification process developed for the introduction of compressive residual stresses. In this process, a high-pressure oil jet impinges on the surface to be peened. Specimens made of AISI 1040 steel were peened at oil pressure of 50 MPa. Residual stresses induced on the oil jet peened specimen was in the order of -200 MPa. Standoff distance influenced the residual stress induced and also the erosion and surface roughness. Fully reversed cantilever bending tests conducted on the peened and unpeened conditions revealed the improved performance of the oil jet peened specimens.

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Suzuki, Akihiro, i Keiichi Maeda. "Chemical Stratification in a Long Gamma-Ray Burst Cocoon and Early-time Spectral Signatures of Supernovae Associated with Gamma-Ray Bursts". Astrophysical Journal 925, nr 2 (1.02.2022): 148. http://dx.doi.org/10.3847/1538-4357/ac3d8d.

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Abstract We present the results of 3D hydrodynamic simulations of a gamma-ray burst (GRB) jet emanating from a massive star with a particular focus on the formation of high-velocity quasi-spherical ejecta and the jet-induced chemical mixing. Recent early-time optical observations of supernovae associated with GRBs (e.g., GRB 171205A/SN 2017iuk) indicate a considerable amount of heavy metals in the high-velocity outer layers of the ejecta. Using our jet simulations, we show that the density and chemical structure of the outer ejecta implied by observations can be naturally reproduced by a powerful jet penetrating the progenitor star. We consider three representative jet models with a stripped massive star, a standard jet, a weak jet, and a jet choked by an extended circumstellar medium, to clarify the differences in the dynamical evolution and the chemical properties of the ejected materials. The standard jet successfully penetrates the progenitor star and creates a quasi-spherical ejecta component (cocoon). The jet-induced mixing significantly contaminates the cocoon with heavy elements that have been otherwise embedded in the inner layer of the ejecta. The weak and choked jet models fail to produce an ultrarelativistic jet but produce a quasi-spherical cocoon with different chemical properties. We discuss the impact of the different jet−star interactions on the expected early-time electromagnetic signatures of long GRBs and how to probe the jet dynamics from observations.

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MELIANI, ZAKARIA, RONY KEPPENS i CHRISTOPHE SAUTY. "TWO-COMPONENT JETS AND THE FANAROFF–RILEY DICHOTOMY". International Journal of Modern Physics D 19, nr 06 (czerwiec 2010): 867–72. http://dx.doi.org/10.1142/s0218271810017056.

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Transversely stratified jets are observed in many classes of astrophysical objects, ranging from young stellar objects, μ-quasars, to active galactic nuclei and even in gamma-ray bursts. Theoretical arguments support this transverse stratification of jets with two components induced by intrinsic features of the central engine (accretion disk + black hole). In fact, according to the observations and theoretical models, a typical jet has an inner fast low density jet, surrounded by a slower, denser, extended jet. We elaborate on this model and investigate for the first time this two-component jet evolution with very high resolution in 3D. We demonstrate that two-component jets with a high kinetic energy flux contribution from the inner jet are subject to the development of a relativistically enhanced, rotation-induced Rayleigh–Taylor type non-axisymmetric instability. This instability induces–strong mixing between both components, decelerating the inner jet and leading to overall jet decollimation. This novel scenario of sudden jet deceleration and decollimation can explain the radio source Fanaroff–Riley dichotomy as a consequence of the efficiency of the central engine in launching the inner jet component versus the outer jet component. We infer that the FRII/FRI transition, interpreted in our two-component jet scenario, occurs when the relative kinetic energy flux of the inner to the outer jet exceeds a critical ratio.

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Cai, Chengzheng, Keda Ren, Jiangfeng Liu i Shuang Liu. "Numerical simulation on downhole flow and temperature fields during drilling with nitrogen jet". Thermal Science 23, Suppl. 3 (2019): 711–17. http://dx.doi.org/10.2298/tsci180610085c.

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In petroleum engineering, nitrogen drilling is an important technology for building wellbores between surfaces and reservoirs. To uncover the downhole flow field and the change rules of rock temperature during drilling with nitrogen jet, we constructed a CFD model by coupling the property equations of nitrogen. The flow fields of nitrogen jet and rock temperature distribution at different times were simulated. Results showed that the high speed nitrogen jet can be efficiently generated because of the nozzle acceleration and the impingement effect can be induced during drilling. The temperature of the nitrogen jet decreased due to the Joule-Thomson effect. This phenomenon suggested that the nitrogen jet induced additional thermal cracks on the bottomhole rock, which was very beneficial for the improvement of rock-breaking efficiency.

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Yang, S. H., S. Y. Jaw i K. C. Yeh. "Cinematographic Analysis of Counter Jet Formation in a Single Cavitation Bubble Collapse Flow". Journal of Mechanics 27, nr 2 (czerwiec 2011): 253–66. http://dx.doi.org/10.1017/jmech.2011.29.

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ABSTRACTThis study utilized a U-shape platform device to generate a single cavitation bubble for the detail analysis of the flow field characteristics and the cause of the counter jet during the process of bubble collapse induced by pressure wave. A series of bubble collapse flows induced by pressure waves of different strengths are investigated by positioning the cavitation bubble at different stand-off distances to the solid boundary. It is found that the Kelvin-Helmholtz vortices are formed when the liquid jet induced by the pressure wave penetrates the bubble surface. If the bubble center to the solid boundary is within one to three times the bubble's radius, a stagnation ring will form on the boundary when impacted by the penetrated jet. The liquid inside the stagnation ring is squeezed toward the center of the ring to form a counter jet after the bubble collapses. At the critical position, where the bubble center from the solid boundary is about three times the bubble's radius, the bubble collapse flows will vary. Depending on the strengths of the pressure waves applied, either just the Kelvin-Helmholtz vortices form around the penetrated jet or the penetrated jet impacts the boundary directly to generate the stagnation ring and the counter jet flow. This phenomenon used the particle image velocimetry method can be clearly revealed the flow field variation of the counter jet. If the bubble surface is in contact with the solid boundary, the liquid jet can only splash radially without producing the stagnation ring and the counter jet. The complex phenomenon of cavitation bubble collapse flows are clearly manifested in this study.

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47

Lai, Adrian C. H., i Joseph H. W. Lee. "Dynamic interaction of multiple buoyant jets". Journal of Fluid Mechanics 708 (10.08.2012): 539–75. http://dx.doi.org/10.1017/jfm.2012.332.

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AbstractAn array of closely spaced round buoyant jets interact dynamically due to the pressure field induced by jet entrainment. Mutual jet attraction can result in a significant change in jet trajectories. Jet merging also leads to overlapping of the passive scalar fields associated with the individual jets, resulting in mixing characteristics that are drastically different from those of an independent free jet. A general semi-analytical model for the dynamic interaction of multiple buoyant jets in stagnant ambient conditions is proposed. The external irrotational flow field induced by the buoyant jets is computed by a distribution of point sinks with strength equal to the entrainment per unit length along the unknown jet trajectories and accounting for boundary effects. The buoyant jet trajectories are then determined by an iterative solution of an integral buoyant jet model by tracking the changes in the external entrainment flow and dynamic pressure fields. The velocity and concentration fields of the jet group are obtained by momentum or kinetic energy superposition for merged jets and plumes, respectively. The modelling approach is supported by numerical solution of the Reynolds-averaged Navier–Stokes equations. The model shows that jet merging and mixing can be significantly affected by jet interactions. Model predictions of the multiple jet trajectories, merging height, as well as the centreline velocity and concentration of the buoyant jet group are in good agreement with experimental data for: (i) a clustered momentum jet group; (ii) a turbulent plume pair; and (iii) a rosette buoyant jet group. Dynamic interactions between a jet group are shown to decrease with the addition of an ambient cross-flow.

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Poh, Teoh Yaw, i Ing Hieng Wong. "A field trial of jet-grouting in marine clay". Canadian Geotechnical Journal 38, nr 2 (1.04.2001): 338–48. http://dx.doi.org/10.1139/t00-093.

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The basement excavation of the Singapore Post Center involved extensive jet-grouting to improve the soft marine clay present within the excavation. The treated soil mass, with much improved strength and deformation characteristics, was intended to act as an internal strut below the bottom of the excavation level, reducing movements caused by the basement excavation. This paper presents the performance of a well-instrumented field jet-grouting trial during the construction of the building basement. Results of monitoring suggest that the jet-grouting trial caused the retaining diaphragm walls and the adjacent soils immediately behind and at some distance away from the walls to move away from the jet-grouted area. The maximum free field lateral soil movements in the excavation side of the jet-grouted mass were much larger than the corresponding lateral movements behind the wall. The results suggest that the diaphragm wall provided considerable restraint, thereby reducing the lateral movements of the soil behind the wall induced by the jet-grouting. Bending moments were induced in the diaphragm walls due to the jet-grouting work. The jet-grouting also caused some increase in the lateral earth pressure and the piezometric levels.Key words: jet-grouting, ground improvement, diaphragm wall, ground movements.

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KOSO, Toru, Yuji KUMA i Noriyoshi ABE. "Self-Induced Oscillation of a Water Jet Issued from a Flip-Flop Jet Nozzle". Proceedings of Conference of Kyushu Branch 2004.57 (2004): 303–4. http://dx.doi.org/10.1299/jsmekyushu.2004.57.303.

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Zhao, Peng, Minxi Zhang i Guoliang Yu. "Flume Experiments on the Oscillating Wall Jet Induced by the Swing Oblique Impingement Jet". Journal of Physics: Conference Series 1300 (sierpień 2019): 012020. http://dx.doi.org/10.1088/1742-6596/1300/1/012020.

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