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Artykuły w czasopismach na temat „Jets Fluid dynamics”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 1 sierpnia 2024

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1

NORMAN, MICHAEL L. "Fluid Dynamics of Astrophysical Jets." Annals of the New York Academy of Sciences 617, no. 1 Nonlinear Ast (December 1990): 217–33. http://dx.doi.org/10.1111/j.1749-6632.1990.tb37807.x.

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2

ESEN, OĞUL, and HASAN GÜMRAL. "LIFTS, JETS AND REDUCED DYNAMICS." International Journal of Geometric Methods in Modern Physics 08, no. 02 (March 2011): 331–44. http://dx.doi.org/10.1142/s0219887811005166.

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We show that complete cotangent lifts of vector fields, their decomposition into vertical representative and holonomic part provide a geometrical framework underlying Eulerian equations of continuum mechanics. We discuss Euler equations for ideal incompressible fluid and momentum-Vlasov equations of plasma dynamics in connection with the lifts of divergence-free and Hamiltonian vector fields, respectively. As a further application, we obtain kinetic equations of particles moving with the flow of contact vector fields both from Lie–Poisson reductions and with the techniques of present framework

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3

Beutner, Thomas, and Christopher Rumsey. "Introduction: Computational Fluid Dynamics Validation for Synthetic Jets." AIAA Journal 44, no. 2 (February 2006): 193. http://dx.doi.org/10.2514/1.22547.

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4

López-Arias, T., L. M. Gratton, G. Zendri, and S. Oss. "Using jets of air to teach fluid dynamics." Physics Education 46, no. 4 (June 29, 2011): 373–75. http://dx.doi.org/10.1088/0031-9120/46/4/f02.

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5

Ramos, J. I. "Fluid dynamics of slender, thin, annular liquid jets." International Journal for Numerical Methods in Fluids 21, no. 9 (November 15, 1995): 735–61. http://dx.doi.org/10.1002/fld.1650210904.

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6

Murzabaeb, M. T., and A. L. Yarin. "Dynamics of sprinkler jets." Fluid Dynamics 20, no. 5 (1986): 715–22. http://dx.doi.org/10.1007/bf01050084.

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7

HERNÁNDEZ C., I., F. A. ACOSTA G., A. H. CASTILLEJOS E., and J. I. MINCHACA M. "The Fluid Dynamics of Secondary Cooling Air-Mist Jets." Metallurgical and Materials Transactions B 39, no. 5 (October 2008): 746–63. http://dx.doi.org/10.1007/s11663-008-9179-x.

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8

Mitrovic, J., and A. Ricoeur. "Fluid dynamics and condensation-heating of capillary liquid jets." International Journal of Heat and Mass Transfer 38, no. 8 (May 1995): 1483–94. http://dx.doi.org/10.1016/0017-9310(94)00258-w.

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9

Miller, Steven A. E., Jérémy Veltin, Philip J. Morris, and Dennis K. McLaughlin. "Assessment of Computational Fluid Dynamics for Supersonic Shock Containing Jets." AIAA Journal 47, no. 11 (November 2009): 2738–46. http://dx.doi.org/10.2514/1.44336.

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10

Milanovic, Ivana M., and K. B. M. Q. Zaman. "Fluid Dynamics of Highly Pitched and Yawed Jets in Crossflow." AIAA Journal 42, no. 5 (May 2004): 874–82. http://dx.doi.org/10.2514/1.2924.

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11

Kong, Qian, Shiqi Yang, Qisi Wang, Zhentao Wang, Qingming Dong, and Junfeng Wang. "Dynamics of electrified jets in electrohydrodynamic atomization." Case Studies in Thermal Engineering 29 (January 2022): 101725. http://dx.doi.org/10.1016/j.csite.2021.101725.

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12

Krutka, Holly M., Robert L. Shambaugh, and Dimitrios V. Papavassiliou. "Using Computational Fluid Dynamics to Simulate Flow Fields from various Melt Blowing Dies." International Nonwovens Journal os-14, no. 1 (March 2005): 1558925005os—14. http://dx.doi.org/10.1177/1558925005os-1400101.

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This paper is an investigation of the flow fields generated by dual rectangular jets. Specifically, the jets examined are the same as the common slot dies used in the industrial melt blowing process. In this process, a molten polymer is attenuated by air discharging from dual jets. The velocity and turbulence of these flow fields determine the rate and quality of polymer fiber production. The flow field characteristics can be simulated quickly and efficiently using computational fluid dynamics (CFD). These CFD simulations require the use of an appropriate length scale to describe the flow fiel

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13

Califano, F., and A. Mangeney. "Mixed layer in a stably stratified fluid." Nonlinear Processes in Geophysics 1, no. 4 (December 31, 1994): 199–208. http://dx.doi.org/10.5194/npg-1-199-1994.

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Abstract. We present a numerical study of the generation and evolution of a mixed layer in a stably stratified layer of Boussinesq fluid. We use an external forcing in the equation of motion to model the experimental situation where the mechanical energy input is due to an oscillating grid. The results of 2D and 3D numerical simulations indicate that the basic mechanism for the entrainment is the advection of the temperature field. This advection tends to produce horizontally thin regions of small temperature vertical gradients (jets) where the hydrodynamics forces are nearly zero. At the bott

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14

Atthanayake, I. U., P. Denissenko, Y. M. Chung, and P. J. Thomas. "Formation–breakdown cycle of turbulent jets in a rotating fluid." Journal of Fluid Mechanics 868 (April 17, 2019): 666–97. http://dx.doi.org/10.1017/jfm.2019.186.

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Results of comprehensive particle image velocimetry measurements investigating the dynamics of turbulent jets in a rotating fluid are presented. It is observed that background system rotation induces a time-periodic formation–breakdown cycle of the jets. The flow dynamics associated with this process is studied in detail. It is found that the frequency of the cycle increases linearly with the background rotation rate. The data show that the onset of the breakdown phase and of the reformation phase of the cycle can be characterized in terms of a local Rossby number employing an internal velocit

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15

Nguyen, Anh V., and Geoffrey M. Evans. "Computational fluid dynamics modelling of gas jets impinging onto liquid pools." Applied Mathematical Modelling 30, no. 11 (November 2006): 1472–84. http://dx.doi.org/10.1016/j.apm.2006.03.015.

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16

Bons, Jeffrey P., Rolf Sondergaard, and Richard B. Rivir. "The Fluid Dynamics of LPT Blade Separation Control Using Pulsed Jets." Journal of Turbomachinery 124, no. 1 (February 1, 2001): 77–85. http://dx.doi.org/10.1115/1.1425392.

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The effects of pulsed vortex generator jets on a naturally separating low-pressure turbine boundary layer have been investigated experimentally. Blade Reynolds numbers in the linear turbine cascade match those for high-altitude aircraft engines and industrial turbine engines with elevated turbine inlet temperatures. The vortex generator jets (30 deg pitch and 90 deg skew angle) are pulsed over a wide range of frequency at constant amplitude and selected duty cycles. The resulting wake loss coefficient versus pulsing frequency data add to previously presented work by the authors documenting the

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17

Souza, Pedro R. C., Odenir de Almeida, and Carlos R. Ilário da Silva. "Aeroacoustic Investigation of High Subsonic Jets in Crossflow." Journal of Theoretical and Computational Acoustics 26, no. 04 (December 2018): 1850031. http://dx.doi.org/10.1142/s2591728518500317.

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The present work investigates the flow and the sound field generated by high subsonic jets in crossflow (JICF). The problem arises when a jet is exhausted perpendicularly into a moving medium. Although being characterized as a very complex flow, the JICF has a well-known fluid dynamics, but a sound field yet to be more explored. Therefore, a hybrid methodology of low computational cost aeroacoustic prediction tool is applied in this work for the complete investigation of this problem. A single jet operating at Mach number 0.75 in a crossflow regime with effective velocity ratios of 4 and 8 is

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18

Khatri, Hemant, and Pavel Berloff. "Role of Eddies in the Maintenance of Multiple Jets Embedded in Eastward and Westward Baroclinic Shears." Fluids 3, no. 4 (November 11, 2018): 91. http://dx.doi.org/10.3390/fluids3040091.

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Multiple zonal jets observed in many parts of the global ocean are often embedded in large-scale eastward and westward vertically sheared background flows. Properties of the jets and ambient eddies, as well as their dynamic interactions, are found to be different between eastward and westward shears. However, the impact of these differences on overall eddy dynamics remains poorly understood and is the main subject of this study. The roles of eddy relative vorticity and buoyancy fluxes in the maintenance of oceanic zonal jets are studied in a two-layer quasigeostrophic model. Both eastward and

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19

Xianzhi, Song, Li Gensheng, Huang Zhongwei, Zhang Laibin, Tian Shouceng, and Wang Haizhu. "Mechanism and Characteristics of Horizontal-Wellbore Cleanout by Annular Helical Flow." SPE Journal 19, no. 01 (June 25, 2013): 45–54. http://dx.doi.org/10.2118/156335-pa.

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Summary Horizontal-wellbore cleanout by rotating jets and annular helical flow has developed rapidly in past decades, in which the annular helical flow is one of the most significant factors to transport the solids in a horizontal wellbore. Because of its complexity and lack of research approaches, the mechanism and characteristics of annular helical flow by high-pressure jets were never revealed comprehensively. By the computational-fluid-dynamics (CFD) method, the flow field of annular helical flow (such as its generation, continuation, and attenuation) was first manifested. The axial veloci

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20

Greenblatt, David, and David R. Williams. "Flow Control for Unmanned Air Vehicles." Annual Review of Fluid Mechanics 54, no. 1 (January 5, 2022): 383–412. http://dx.doi.org/10.1146/annurev-fluid-032221-105053.

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The pervasiveness of unmanned air vehicles (UAVs), from insect to airplane scales, combined with active flow control maturity, has set the scene for vehicles that differ markedly from present-day configurations. Nano and micro air vehicles, with characteristic Reynolds numbers typically less than 105, rely on periodically generated leading-edge vortices for lift generation, propulsion, and maneuvering. This is most commonly achieved by mechanical flapping or pulsed plasma actuation. On larger UAVs, with Reynolds numbers greater than 105, externally driven and autonomous fluidic systems continu

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21

Xu, Peng, Agus Sasmito, and Arun Mujumdar. "A computational study of heat transfer under twin turbulent slot jets impinging on planar smooth and rough surfaces." Thermal Science 20, suppl. 1 (2016): 47–57. http://dx.doi.org/10.2298/tsci151130016x.

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The flow and heat transfer characteristics of twin turbulent slot jets impinging on planar smooth and rough surfaces are examined using a computational fluid dynamics model. The interaction between jets lowers the heat transfer performance of each jet in the zone where the wall jets collide. A single jet performs better than the equivalent twin jet. The average heat transfer under twin jets which are injected alternately so that each one of the pair of jets behaves like a single jet, is found to be better than twin jets issuing simultaneously. It is proposed that alternating jet flows in the t

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22

GRINSTEIN, FERNANDO F. "Vortex dynamics and entrainment in rectangular free jets." Journal of Fluid Mechanics 437 (June 22, 2001): 69–101. http://dx.doi.org/10.1017/s0022112001004141.

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Simulations of low-aspect-ratio, rectangular free jets are presented. The investigations focus on the entrainment and transitional vortex dynamics in compressible (subsonic) jets initialized with laminar conditions, a thin vortex sheet with slightly rounded-off corner regions, and uniform initial momentum thickness. A monotonically integrated large-eddy simulation approach based on the solution of the unsteady flow equations with high-resolution monotone algorithms is used. Inherent uncertainties in the jet entrainment measurement process are addressed using the database from laboratory experi

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23

Yakhya, Saleh, Sami Ernez, and François Morency. "Computational Fluid Dynamics Investigation of Transient Effects of Aircraft Ground Deicing Jets." Journal of Thermophysics and Heat Transfer 33, no. 1 (January 2019): 117–27. http://dx.doi.org/10.2514/1.t5428.

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24

Rumsey, C. L., T. B. Gatski, W. L. Sellers, V. N. Vasta, and S. A. Viken. "Summary of the 2004 Computational Fluid Dynamics Validation Workshop on Synthetic Jets." AIAA Journal 44, no. 2 (February 2006): 194–207. http://dx.doi.org/10.2514/1.12957.

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25

Morris, R. M., J. A. Snyman, and J. P. Meyer. "Jets in Crossflow Mixing Analysis Using Computational Fluid Dynamics and Mathematical Optimization." Journal of Propulsion and Power 23, no. 3 (May 2007): 618–28. http://dx.doi.org/10.2514/1.22136.

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26

Azim, M. A. "Isothermal free jets in high-temperature surroundings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 8 (May 16, 2011): 1913–18. http://dx.doi.org/10.1177/0954406211401488.

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Two types of isothermal free jets, named positively and negatively buoyant, have been studied numerically to discern the effect of surrounding temperatures on their flow dynamics. Turbulence closure in those jets was achieved by standard k - ε model. The governing equations were solved using Implicit θ-Scheme and Tridiagonal Matrix Algorithm. Calculations were made for the jets having constant temperature at 20 °C and by varying surrounding temperatures from 20°C to 1000°C. It is clear that negatively buoyant jets but not the positively buoyant jets are nearly invariant to the change in surrou

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27

Madaliev, Murodil, Zokhidjon Abdulkhaev, Jamshidbek Otajonov, Khasanboy Kadyrov, Inomjan Bilolov, Sharabiddin Israilov, and Nurzoda Abdullajonov. "Comparison of numerical results of turbulence models for the problem of heat transfer in turbulent molasses." E3S Web of Conferences 508 (2024): 05007. http://dx.doi.org/10.1051/e3sconf/202450805007.

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The study introduces Malikov's two-fluid methodology along with the RSM turbulence model for simulating turbulent heat transfer phenomena. It elucidates that temperature fluctuations within turbulent flows arise from temperature differentials between the respective fluids. Leveraging the two-fluid paradigm, the researchers develop a mathematical framework to characterize turbulent heat transfer dynamics. This resultant turbulence model is then applied to analyze heat propagation in turbulent flows around a flat plate and in scenarios involving submerged jets. To validate the model's efficacy,

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28

Castillo, Luis G., José M. Carrillo, and Álvaro Sordo-Ward. "Simulation of overflow nappe impingement jets." Journal of Hydroinformatics 16, no. 4 (January 18, 2014): 922–40. http://dx.doi.org/10.2166/hydro.2014.109.

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Rectangular jets constitute one of the energy dissipation methods in the overtopping of dams. The high turbulence and aeration phenomena that appear in falling jets and dissipation basins make it difficult to carry out studies based only on classical methodologies. There are studies modelling spillways with computational fluid dynamics which produces accurate results. However, the study of overflow nappe impingement jets has not been sufficiently examined. Simulations of free air–water overflow weirs are scarce, and require small mesh sizes and a high computational effort. This work seeks to a

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29

Fromm, C. M., Z. Younsi, A. Baczko, Y. Mizuno, O. Porth, M. Perucho, H. Olivares, et al. "Using evolutionary algorithms to model relativistic jets." Astronomy & Astrophysics 629 (August 22, 2019): A4. http://dx.doi.org/10.1051/0004-6361/201834724.

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Context. High-resolution very long baseline interferometry (VLBI) observations of NGC 1052 show a two sided jet with several regions of enhanced emission and a clear emission gap between the two jets. This gap shrinks with increasing frequency and vanishes around ν ∼ 43 GHz. The observed structures are due to both the macroscopic fluid dynamics interacting with the surrounding ambient medium including an obscuring torus and the radiation microphysics. In order to model the observations of NGC 1052 via state-of-the art numerical simulations both the fluid-dynamical and emission processes have t

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30

Valizadeh, Alireza, Jason P. Antenucci, and Grant Griffith. "REGULAR WAVE EFFECTS ON NEGATIVELY BUOYANT JETS." Coastal Engineering Proceedings, no. 36v (December 28, 2020): 13. http://dx.doi.org/10.9753/icce.v36v.waves.13.

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Seawater desalination is an increasingly important technology in the supply of potable water to municipal communities. Brine created by this process is typically released back to the ocean via a nearshore diffuser into a wave-exposed climate. Despite this, little work has been published on the effect of waves on negatively buoyant jets. In this paper we outline the literature on this topic and the results of a series of computational fluid dynamics (CFD) simulations that address the role of regular waves on negatively buoyant jets.Recorded Presentation from the vICCE (YouTube Link): https://yo

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31

Selimefendigil, Fatih, Hakan F. Oztop, and Mikhail A. Sheremet. "Thermoelectric Generation with Impinging Nano-Jets." Energies 14, no. 2 (January 18, 2021): 492. http://dx.doi.org/10.3390/en14020492.

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In this study, thermoelectric generation with impinging hot and cold nanofluid jets is considered with computational fluid dynamics by using the finite element method. Highly conductive CNT particles are used in the water jets. Impacts of the Reynolds number of nanojet stream combinations (between (Re1, Re2) = (250, 250) to (1000, 1000)), horizontal distance of the jet inlet from the thermoelectric device (between (r1, r2) = (−0.25, −0.25) to (1.5, 1.5)), impinging jet inlet to target surfaces (between w2 and 4w2) and solid nanoparticle volume fraction (between 0 and 2%) on the interface tempe

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32

Scott, Lewis, Antonia Borissova, Alan Burns, and Mojtaba Ghadiri. "Analysis of hold-up and grinding pressure in a spiral jet mill using CFD-DEM." EPJ Web of Conferences 249 (2021): 12004. http://dx.doi.org/10.1051/epjconf/202124912004.

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A spiral jet mill was simulated using Discrete Element Method modelling and Computational Fluid Dynamics. The particle behaviour and fluid motion were analysed as a function of hold-up and grinding pressure. Particle collision energy was predicted to be prevalent along the bed surface and in front of the grinding jets, as shown through the collision data recorded. The bed itself affects the fluid flow field, as momentum is transferred to the particles. Increasing the grinding pressure does not result in a proportional increase in the kinetic energy of the particle system, as the high pressure

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33

Voropayev, S. I., Ya D. Afanasyev, and I. A. Filippov. "Horizontal jets and vortex dipoles in a stratified fluid." Journal of Fluid Mechanics 227 (June 1991): 543–66. http://dx.doi.org/10.1017/s0022112091000241.

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When a horizontal force is applied locally to some volume of a viscous densitystratified fluid, flows with high concentration of vertically oriented vorticity (vortex dipoles) are generated. The processes of generation and evolution with time of these unsteady flows in a stratified fluid are studied. A convenient way to produce and study these flows in the laboratory is to use a submerged horizontal jet as a ‘point’ source of momentum. The main governing parameter (the ‘force’) is easily controlled in this case. Two regimes were studied: starting jets with dipolar vortex fronts (the force acts

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34

Bogy, D. B., and F. E. Talke. "Mechanics-Related Problems of Magnetic Recording Technology and Ink-Jet Printing." Applied Mechanics Reviews 39, no. 11 (November 1, 1986): 1665–77. http://dx.doi.org/10.1115/1.3149508.

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In this paper, mechanical aspects of magnetic recording technology and nonimpact printing are discussed. In the recording area, theoretical and experimental aspects of air bearing theory, head/disk dynamics, and head/disk tribology are studied. Flutter of rotating disks is investigated, the flow field between rotating disks is described, and nonrepeatable run-out of disk file spindles is studied. Furthermore, the head/disk interface for flexible media is discussed and dimensional stability of flexible substrate is examined. In the printing area, experimental and theoretical investigations usin

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35

Song, XiaoWen, and MingXiao Zhang. "Turbulent Drag Reduction Characteristics of Bionic Nonsmooth Surfaces with Jets." Applied Sciences 9, no. 23 (November 24, 2019): 5070. http://dx.doi.org/10.3390/app9235070.

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Aiming at aerodynamic drag reduction for transportation systems, a new active surface is proposed that combines a bionic nonsmooth surface with a jet. Simulations were performed in the computational fluid dynamics software STAR-CCM+ to investigate the flow characteristics and drag reduction efficiency. The SST K-Omega model was used to enclose the equations. The simulation results showed that when the active surface simultaneously reduced the skin friction and overcame the sharp increase of pressure drag caused by a common nonsmooth surface, the total net drag decreased. The maximum drag reduc

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36

Balk, A. M. "The Rossby wave extra invariant in the dynamics of 3-D fluid layers and the generation of zonal jets." Nonlinear Processes in Geophysics 21, no. 1 (January 10, 2014): 49–59. http://dx.doi.org/10.5194/npg-21-49-2014.

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Abstract. We consider an adiabatic-type (approximate) invariant that was earlier obtained for the quasi-geostrophic equation and the shallow water system; it is an extra invariant, in addition to the standard ones (energy, enstrophy, momentum), and it is based on the Rossby waves. The presence of this invariant implies the energy transfer from small-scale eddies to large-scale zonal jets. We show that this extra invariant can be extended to the dynamics of a three-dimensional (3-D) fluid layer on the beta plane. Combined with the investigation of other researchers, this 3-D extension implies e

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37

Liu, Yong, Jia Li, Yu Tian, Jian Liu, and Jie Fan. "Multi-Physics Coupled FEM Method to Simulate the Formation of Crater-Like Taylor Cone in Electrospinning of Nanofibers." Journal of Nano Research 27 (March 2014): 153–62. http://dx.doi.org/10.4028/www.scientific.net/jnanor.27.153.

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Crater-like Taylor cone electrospinning is a novel, simple, and powerful approach to mass produce nanofibers. The Taylor cone, crater-like liquid bump on the free liquid surface, in this electrospinning process plays a key role to produce multiple fluid jets which finally solidifies nanofibers. A multi-physics coupled FEM method was employed to simulate the dynamic formation process of crater-like Taylor Cone in crater-like electrospinning. A blended k−ω /k−ε model for turbulence and dynamic overset grids to resolve large amplitude motions were used to simulate two-dimensional uncompressed flo

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38

Rhines, P. B. "Jets and Orography: Idealized Experiments with Tip Jets and Lighthill Blocking." Journal of the Atmospheric Sciences 64, no. 10 (October 1, 2007): 3627–39. http://dx.doi.org/10.1175/jas4008.1.

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Abstract This paper describes qualitative features of the generation of jetlike concentrated circulations, wakes, and blocks by simple mountainlike orography, both from idealized laboratory experiments and shallow-water numerical simulations on a sphere. The experiments are unstratified with barotropic lee Rossby waves, and jets induced by mountain orography. A persistent pattern of lee jet formation and lee cyclogenesis owes its origins to arrested topographic Rossby waves above the mountain and potential vorticity (PV) advection through them. The wake jet occurs on the equatorward, eastern f

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39

Liu, C. M., A. Vaivads, Y. V. Khotyaintsev, H. S. Fu, D. B. Graham, K. Steinvall, Y. Y. Liu, and J. L. Burch. "Cross-scale Dynamics Driven by Plasma Jet Braking in Space." Astrophysical Journal 926, no. 2 (February 1, 2022): 198. http://dx.doi.org/10.3847/1538-4357/ac4979.

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Abstract Plasma jets are ubiquitous in space. In geospace, jets can be generated by magnetic reconnection. These reconnection jets, typically at fluid scale, brake in the near-Earth region, dissipate their energies, and drive plasma dynamics at kinetic scales, generating field-aligned currents that are crucial to magnetospheric dynamics. Understanding of the cross-scale dynamics is fundamentally important, but observation of coupling among phenomena at various scales is highly challenging. Here we report, using unprecedentedly high-cadence data from NASA's Magnetospheric Multiscale Mission, th

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40

Ezhova, E. V., D. A. Sergeev, A. A. Kandaurov, and Yu I. Troitskaya. "Nonsteady dynamics of turbulent axisymmetric jets in stratified fluid: Part 1. Experimental study." Izvestiya, Atmospheric and Oceanic Physics 48, no. 4 (July 2012): 409–17. http://dx.doi.org/10.1134/s0001433812040081.

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41

Moore, Eric M., Robert L. Shambaugh, and Dimitrios V. Papavassiliou. "Analysis of isothermal annular jets: Comparison of computational fluid dynamics and experimental data." Journal of Applied Polymer Science 94, no. 3 (2004): 909–22. http://dx.doi.org/10.1002/app.20963.

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42

Lotfiani, Amin, Shahram Khalilarya, and Samad Jafarmadar. "A semi-analytical model for the prediction of the behavior of turbulent coaxial gaseous jets." Thermal Science 17, no. 4 (2013): 1221–32. http://dx.doi.org/10.2298/tsci110701140l.

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In diffusion combustion systems, fuel and oxidizer (usually air) are admitted into the combustion chamber separately in the form of turbulent jets. Most often, fuel enters the furnace from a round nozzle and air is admitted through an annulus surrounding the central fuel nozzle. Momentum of the fuel and air jets is utilized for directing the flame and controlling the mixture formation which is typically the rate-limiting step of the combustion process. Hence the behavior of turbulent coaxial jets must be well understood prior to any detailed analysis of these systems. In this study, a set of r

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Untuç, Ahmet Hikmet, and Salih Ozen Unverdi. "Heat Transfer Enhancement by Mitigating the Adverse Effects of Crossflow in a Multi-Jet Impingement Cooling System in Hexagonal Configuration by Coaxial Cylindrical Protrusion—Guide Vane Pairs." Applied Sciences 13, no. 20 (October 13, 2023): 11260. http://dx.doi.org/10.3390/app132011260.

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A novel compound multi-jet impingement system for enhanced cooling of a flat surface by augmenting its area with cylindrical protrusions (CPs) equipped with coaxial guide vanes (CGVs) and reducing deflection of jets by crossflow has been developed for high-heat removal applications. The cooling performance of coaxial circular jets impinging on the top faces of CPs placed in hexagonal configuration on a flat plate is evaluated by three-dimensional (3D) computational fluid dynamics (CFD) simulations. Jets impinging on the top faces of the protrusions are directed to their lateral faces and then

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Joshi, Raj Kishor, Sanjit Debnath, and Indranil Chattopadhyay. "Shocks in Radiatively Driven Time-dependent, Relativistic Jets around Black Holes." Astrophysical Journal 933, no. 1 (July 1, 2022): 75. http://dx.doi.org/10.3847/1538-4357/ac70de.

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Abstract We study time-dependent relativistic jets under the influence of the radiation field of the accretion disk. The accretion disk consists of an inner compact corona and an outer sub-Keplerian disk. The thermodynamics of the fluid is governed by a relativistic equation of state (EOS) for multispecies fluid that enables us to study the effect of composition on jet dynamics. Jets originate from the vicinity of the central black hole, where the effect of gravity is significant and traverses large distances where only special relativistic treatment is sufficient. So we have modified the flat

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Loureiro, Juliana Braga Rodrigues, and Atila Pantaleão Silva Freire. "Erosion Characterization Of Gas-Solid Jets Impinging Onto Inclined Surfaces." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–5. http://dx.doi.org/10.55037/lxlaser.21st.194.

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Erosion caused by solid particles is an important phenomenon in many industrial applications. Wear modelling is a complex phenomenon due to the many relevant variables. In any event, the dynamics of the fluid flow and particles need to be characterized so that their interrelations are well understood and models can be advanced. Depending on their sizes, particles immersed in solid-gas flows may deviate from the fluid stream, meaning that any deployed measuring technique must take this into account. The work describes through PIV and PTV the flow and particle dynamics of a round air-jet loaded

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Wang, Zhifeng, Zhengyang Feng, Jinsen Hu, Yuning Zhang, and Yuning Zhang. "Numerical Investigations on the Jet Dynamics during Cavitation Bubble Collapsing between Dual Particles." Symmetry 16, no. 5 (April 29, 2024): 535. http://dx.doi.org/10.3390/sym16050535.

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The jet dynamics during cavitation bubble collapsing between unequal-sized dual particles are investigated utilizing a numerical model that combines the finite volume approach alongside the volume of fluid approach. The model incorporates the compressibility of the two-phase fluid and accounts for mass and heat transfer between two phases. The computational model utilizes an axisymmetric model, where the axis of symmetry is defined as the line that connects the centers of the particles and the bubble. A comprehensive analysis is presented on the influence of the particle radius and bubble–part

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Díaz-Figueroa, Elton Everardo, Gonzalo Ares de Parga, and José Juan González-Avilés. "Influence of the Magnetic Field Topology in the Evolution of Small-Scale Two-Fluid Jets in the Solar Atmosphere." Physics 5, no. 1 (February 27, 2023): 261–75. http://dx.doi.org/10.3390/physics5010020.

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In this paper, a series of numerical simulations is performed to recreate small-scale two-fluid jets using the JOANNA code, considering the magnetohydrodynamics of two fluids (ions plus electrons and neutral particles). First, the jets are excited in a uniform magnetic field by using velocity pulse perturbations located at y0= 1.3, 1.5, and 1.8 Mm, considering the base of the photosphere at y=0. Then, the excitation of the jets is repeated in a magnetic field that mimics a flux tube. Mainly, the jets excited at the upper chromosphere (y∼1.8 Mm) reach lower heights than those excited at the low

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Kranz, Michael, Tracy Hudson, Michael Whitley, and Brian English. "Integrated Localized Cooling using Piezoelectrically-Driven Synthetic Jets." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2014, DPC (January 1, 2014): 001072–106. http://dx.doi.org/10.4071/2014dpc-tp35.

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RF communication and radar systems present an extreme thermal management challenge. These systems are comprised of tightly packaged and high wattage components requiring a controlled temperature to meet performance and reliability parameters. In these systems, there is little space available for air flow or other traditional cooling methods. In addition, the heat generating components are typically microscale semiconductor devices fabricated on integrated circuit substrates buried deep within the system. Localized cooling using integrated microsystems may provide a solution to these thermal ma

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Zhang, Qiang, Yu Tamanoi, and Kotaro Sato. "Influence of secondary flow with a Coanda surface on the direction of jets." Journal of Physics: Conference Series 2252, no. 1 (April 1, 2022): 012003. http://dx.doi.org/10.1088/1742-6596/2252/1/012003.

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Abstract We propose a method for fluidic thrust vectoring by studying the effect of excited secondary Coanda flow on the direction of jets. The primary flow is the steady continuous jet, while the the secondary flow is synthetic jet or continuous flow. In this experiment, speaker is used to adjusted the frequency and velocity amplitude of synthetic jets, while a blower is used to adjust the continuous jet and suction flow.We visualize and compare the primary flow under the influence of various secondary flows. Additionally, computational fluid dynamics is used to investigate the flow character

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Zhang, Qiang, Yu Tamanoi, and Kotaro Sato. "Influence of secondary flow with a Coanda surface on the direction of jets." Journal of Physics: Conference Series 2252, no. 1 (April 1, 2022): 012003. http://dx.doi.org/10.1088/1742-6596/2252/1/012003.

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Abstract We propose a method for fluidic thrust vectoring by studying the effect of excited secondary Coanda flow on the direction of jets. The primary flow is the steady continuous jet, while the the secondary flow is synthetic jet or continuous flow. In this experiment, speaker is used to adjusted the frequency and velocity amplitude of synthetic jets, while a blower is used to adjust the continuous jet and suction flow.We visualize and compare the primary flow under the influence of various secondary flows. Additionally, computational fluid dynamics is used to investigate the flow character

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