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Relevant bibliographies by topics / Free air jet

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Academic literature on the topic 'Free air jet'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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Journal articles on the topic "Free air jet"

1

Won, Im Hee, Sung Kil Kang, Jae-Yoon Sim, and Jae Koo Lee. "Ozone-Free Portable Microwave Atmospheric Air Plasma Jet." IEEE Transactions on Plasma Science 42, no. 10 (2014): 2788–89. http://dx.doi.org/10.1109/tps.2014.2320266.

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Carrillo, José M., Patricio R. Ortega, Luis G. Castillo, and Juan T. García. "Experimental Characterization of Air Entrainment in Rectangular Free Falling Jets." Water 12, no. 6 (2020): 1773. http://dx.doi.org/10.3390/w12061773.

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This experimental study presents an analysis of the air–water flow in rectangular free-falling jets. The measurements were obtained downstream of a 1.05 m wide sharp-crested weir. The properties of the air–water flow were registered in several cross-sections of the nappe. A conductivity phase detection probe was employed, sampling at 20 kHz. Three different specific flows were considered, with energy head over the crest of 0.080, 0.109 and 0.131 m to avoid scale effects. To analyze the flow properties, air–water parameters during the fall, such as the phase change spatial distribution, air–wat

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3

Kareeva, Yulia R., Vladimir N. Posokhin, Rinat G. Safiullin, and Ksenia A. Bliznyakova. "Study of air jet characteristics in air-conditioned rooms." MATEC Web of Conferences 324 (2020): 03009. http://dx.doi.org/10.1051/matecconf/202032403009.

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The research deals with supply air jets in air-conditioned rooms which have different lengths. The study was conducted according to the numerical method using the Fluent software package. Discharge conditions are equal in all cases. As a result, dependences of main kinematic and geometric jet’s characteristics (width and jet range, longitudinal velocity profiles, axial velocity, average velocity of the back flow, flow rates in the cross sections of the direct and back flows, distribution of static pressure along the length of the jet) on longitudinal constraint parameter are determined (length

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Vermeulen, P. J., P. Rainville, and V. Ramesh. "Measurements of the Entrainment Coefficient of Acoustically Pulsed Axisymmetric Free Air Jets." Journal of Engineering for Gas Turbines and Power 114, no. 2 (1992): 409–15. http://dx.doi.org/10.1115/1.2906606.

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Novel direct measurements of the entrainment coefficient in the initial zone of a pulsating air jet have been successfully accomplished. A series of pulsating air jets flowing from different nozzle orifice sizes into surrounding air were investigated for the effects of jet axial length, excitation power, and Strouhal number. The entrainment coefficient of the excited jet varied strongly with axial distance downstream of the orifice exit plane and with pulsation strength. The acoustic drive considerably increased the entrainment coefficient by up to 4.6 times at 10 diameters downstream of the n

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Muralha, António, José F. Melo, and Helena M. Ramos. "Assessment of CFD Solvers and Turbulent Models for Water Free Jets in Spillways." Fluids 5, no. 3 (2020): 104. http://dx.doi.org/10.3390/fluids5030104.

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The capability of two different OpenFOAM® solvers, namely interFoam and twoPhaseEulerFoam, in reproducing the behavior of a free water jet was investigated. Numerical simulations were performed in order to obtain the velocity and air concentration profiles along the jet. The turbulence intensity was also analyzed. The obtained results were compared with published experimental data and, in general, similar velocity and air concentration profiles were found. InterFoam solver is able to reproduce the velocity field of the free jet but has limitations in the simulation of the air concentration. Tw

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Manivannan, Ponnambalam, and Banbla Sridhar. "Characteristic study of non-circular incompressible free jet." Thermal Science 17, no. 3 (2013): 787–800. http://dx.doi.org/10.2298/tsci110208116m.

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This paper reports an experimental investigation of bulk properties of turbulent, which is three dimensional, incompressible, air jets issuing into still air surrounding from the nozzles. The jet orifices utilized included circular, hexagonal and cruciform geometries. Experimental results of pertinent mean flow properties such as axis velocity decay, half width growth, potential core and turbulence intensities are reported. Single Hotwire anemometer was used for measurements of the velocity field. The experiment for the three jets was conducted under the same nominal conditions with the exit R

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Carrillo, José M., Patricio R. Ortega, Luis G. Castillo, and Juan T. García. "Air–Water Properties in Rectangular Free-Falling Jets." Water 13, no. 11 (2021): 1593. http://dx.doi.org/10.3390/w13111593.

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This study analyzes the air–water flow properties in overflow nappe jets. Data were measured in several cross-sections of rectangular free-falling jets downstream of a sharp-crested weir, with a maximum fall distance of 2.0 m. The flow properties were obtained using a conductivity phase-detection probe. Furthermore, a back-flushing Pitot-Prandtl probe was used in order to obtain the velocity profiles. Five specific flows rates were analyzed, from 0.024 to 0.096 m3/s/m. The measurements of the air–water flow allowed us to characterize the increment of the air entrainment during the fall, affect

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Pathirana, Walisinghe. "Blueprint for Designing an Air-Free Fluid Jet Potentiser." Homoeopathic Links 27, no. 04 (2014): 245–51. http://dx.doi.org/10.1055/s-0034-1383224.

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9

Boulton-Stone, J. M., and J. R. Blake. "Gas bubbles bursting at a free surface." Journal of Fluid Mechanics 254 (September 1993): 437–66. http://dx.doi.org/10.1017/s0022112093002216.

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When a small air bubble bursts from an equilibrium position at an air/water interface, a complex motion ensues resulting in the production of a high-speed liquid jet. This free-surface motion following the burst is modelled numerically using a boundary integral method. Jet formation and liquid entrainment rates from jet breakup into drops are calculated and compared with existing experimental evidence. In order to investigate viscous effects, a boundary layer is included in the calculations by employing a time-stepping technique which allows the boundary mesh to remain orthogonal to the surfac

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ZHU, YONGGANG, HASAN N. OĞUZ, and ANDREA PROSPERETTI. "On the mechanism of air entrainment by liquid jets at a free surface." Journal of Fluid Mechanics 404 (February 10, 2000): 151–77. http://dx.doi.org/10.1017/s0022112099007090.

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The process by which a liquid jet falling into a liquid pool entrains air is studied experimentally and theoretically. It is shown that, provided the nozzle from which the jet issues is properly contoured, an undisturbed jet does not entrap air even at relatively high Reynolds numbers. When surface disturbances are generated on the jet by a rapid increase of the liquid flow rate, on the other hand, large air cavities are formed. Their collapse under the action of gravity causes the entrapment of bubbles in the liquid. This sequence of events is recorded with a CCD and a high-speed camera. A bo

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Dissertations / Theses on the topic "Free air jet"

1

Massey, Kevin C. "Flow/acoustic coupling in heated and unheated free and ducted jets." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11971.

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Yee, Tien Mun. "THREE-DIMENSIONAL FREE SURFACE NON-HYDROSTATIC MODELING OF PLUNGING WATER WITH TURBULENCE AND AIR ENTRAINED TRANSPORT." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/699.

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The advance in computational fluid dynamics in recent years has provided the opportunity for many fluid dynamic problems to be analyzed numerically. One such problem concerns the modeling of plunging water into a still water body, often encountered in pump stations. Air bubbles introduced into the system by the plunging jet can be a significant problem, especially when consumed into operating pumps. The classical approach to investigate the hydrodynamics of plunging jet in pump stations is by physical model studies. This approach is time consuming, tedious and costly. The availability of compu

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内山, 知実, Tomomi UCHIYAMA, 正章成瀬 та Masaaki NARUSE. "自由落下粒子群が形成する粒子噴流の三次元渦法解析". 日本機械学会, 2005. http://hdl.handle.net/2237/9206.

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内山, 知実, Tomomi UCHIYAMA, 佳伸北野 та Yoshinobu KITANO. "自由落下粒子群が形成する粒子噴流の数値解析". 日本機械学会, 2003. http://hdl.handle.net/2237/9212.

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Šeda, Libor. "Analýza proudění z vyústky osobního vozu s využitím termoanemometrické sondy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231972.

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In this master’s thesis there are summarized fundamental findings about air flow velocity measurements and afterwards introduced the measuring track for automobile car vents, measured object and track arrangement and all used components. Velocity field measurement method is how wire anemometry, and apart from 4 main cases measurements of free air jet, there are velocity profiles in piping measured as an input for CFD simulation. Air vent evaluation criteria are described and their assessment is done for specified cases. Further, there is a CFD simulation presented with comparison to experiment

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Broukal, Jakub. "Výpočtové modelování laboratorního hořáku programem FLUENT." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228876.

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Tato diplomová práce je zaměřena na porovnání různých turbulentních a chemických modelů na příkladu volné metanové trysky ústící do vzduchu. Nejprve je uveden teoretický úvod k modelům, následován CFD (Ansys Fluent) simulacemi plamene pomocí vybraných modelů. Jako součást práce je provedeno a vyhodnoceno experimentální měření. V závěru jsou experimentální výsledky porovnány s nasimulovanými daty.

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DeWulf, Michael D. "Computational fluid dynamics prediction of subsonic axisymmetric and two-dimensional heated free turbulent air jets." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384691.

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Thesis (M.S. in Mechanical Engineering and Mechanical Engineer) Naval Postgraduate School, Sept. 2000.<br>Thesis advisor(s): Millsaps, Knox T. Includes bibliographical references (p. 117-119). Also available online.

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Koehr, Bernard E. "An experimental study of the mechanism of air entrainment by planar liquid jets at a free surface." Available to US Hopkins community, 2002. http://wwwlib.umi.com/dissertations/dlnow/3068176.

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Martone, Joseph Arthur. "Sampling submicrometer particles suspended in near sonic and supersonic free jets of air." Thesis, 1990. http://hdl.handle.net/1957/37476.

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This experiment is concerned with sampling submicrometer particles in near sonic and supersonic flows. The study employed a high volume condensation aerosol generator to produce stearic acid particles having a geometric mean diameter of 0.8 μm and a geometric standard deviation of 1.28. The aerosol was diluted with dry air and accelerated to Mach 0.6, 0.8, 1.26, or 1.47 through a flow nozzle. Aerosol mass concentrations were determined using a small bore probe in the jet and by a large bore probe sampling isokinetically upstream of the jet nozzle. The results of both samples were compared to c

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Books on the topic "Free air jet"

1

Cusworth, Roland Alan. Turbulence structure of a premixed flame in a coaxial free air jet in the presence or absence of a base flow. Graduate Department of Aerospace Science and Engineering, University of Toronto, 1992.

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2

Martone, Joseph Arthur. Sampling submicrometer particles suspended in near sonic and supersonic free jets of air. 1990.

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3

Computational Fluid Dynamics Prediction of Subsonic Axisymmetric and Two-Dimensional Heated Free Turbulent Air Jets. Storming Media, 2000.

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Book chapters on the topic "Free air jet"

1

Longmire, Ellen K., and Steven L. Anderson. "Particle/Vortex Interactions in Free and Impinging Air Jets." In Manipulation and Control of Jets in Crossflow. Springer Vienna, 2003. http://dx.doi.org/10.1007/978-3-7091-2792-6_16.

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2

"Jet Trajectory Calculations." In Air Bubble Entrainment in Free-Surface Turbulent Shear Flows. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012168110-4/50034-5.

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3

Chanson, Hubert. "Air Entrainment in Plunging Jet Flows." In Air Bubble Entrainment in Free-Surface Turbulent Shear Flows. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012168110-4/50012-6.

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Chanson, Hubert. "Plunging Jet Flows : Presentation." In Air Bubble Entrainment in Free-Surface Turbulent Shear Flows. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012168110-4/50009-6.

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"Flame Propagation and Pressure Buildup in a Free Gas-Air Mixture Due to Jet Ignition." In Dynamics of Shock Waves, Explosions, and Detonations. American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/5.9781600865695.0474.0490.

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6

Chanson, Hubert. "Air Entrainment by Plunging Jets." In Air Bubble Entrainment in Free-Surface Turbulent Shear Flows. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012168110-4/50010-2.

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Chanson, Hubert. "Air Entrainment in High-Velocity Water Jets." In Air Bubble Entrainment in Free-Surface Turbulent Shear Flows. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012168110-4/50019-9.

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"Air Bubble Diffusion at Plunging Water Jets." In Air Bubble Entrainment in Free-Surface Turbulent Shear Flows. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012168110-4/50029-1.

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9

"Characteristics of Free Air Jets, Push-Pull Exhaust Systems, and Air Curtains." In Hemeon’s Plant & Process Ventilation, edited by D. Jeff Burton. CRC Press, 2018. http://dx.doi.org/10.1201/9780203752098-9.

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"Air Concentration Distributions in Water Jets Discharging Into the Atmosphere." In Air Bubble Entrainment in Free-Surface Turbulent Shear Flows. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012168110-4/50033-3.

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Conference papers on the topic "Free air jet"

1

Lopez, Jose M., Dana V. Danciu, Marco J. Da Silva, Uwe Hampel, and Ram Mohan. "Experiments on Air Entrainment due to Free Falling- and Wall-Jets." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30789.

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In this article, air entrainment as a result of an impinging round water jet and a wall-jet was experimentally studied by means of videometry and image processing methods and also by means of a measurement technique based on a wire-mesh sensor. Therefore, two different experimental setups were utilized. For the first setup, a series of experiments at different conditions was performed and evaluated for both round jets and wall-jets. Jet lengths ranged between 0.01 and 0.2 m and jet exit velocities between 0.9 and 3.5 m/s. Image processing algorithms were applied to extract information about je

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2

Vermeulen, P. J., P. Rainville, and V. Ramesh. "Measurements of the Entrainment Coefficient of Acoustically Pulsed Axisymmetric Free Air Jets." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-235.

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Novel direct measurements of the entrainment coefficient in the initial zone of a pulsating air jet have been successfully accomplished. A series of pulsating air jets flowing from different nozzle orifice sizes into surrounding air were investigated for the effects of jet axial length, excitation power and Strouhal number. The entrainment coefficient of the excited jet varied strongly with axial distance downstream of the orifice exit plane and with pulsation strength. The acoustic drive considerably increased the entrainment coefficient by up to 4.6 times at 10 diameters downstream of the no

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3

Gori, F., and E. Nino. "Fluid Dynamics Measurements and Flow Visualizations of a Free Slot Jet of Air." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41027.

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The paper reports flow visualizations of a free slot jet of air, obtained with the shadowgraph technique, in the Reynolds number range allowed by the experimental apparatus, i.e. from Re=1,682 to Re=22,107. The Reynolds number is based on the hydraulic diameter of the slot. The shadowgraphs have confirmed the presence of the undisturbed region of flow, which is the zone of the jet flow where velocity and turbulence are about the same as those measured on the slot exit. The undisturbed region of flow is dependent on the Reynolds number. It is higher than three times the slot height, for Re=1,68

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Law, Deify, and Agustin Valdez. "Computational Modeling and Simulations of Isothermal Plane (Linear) Air Jet Velocity Profile for Slot Diffusers." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37317.

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In the present work, computational modeling and simulations of isothermal plane (linear) air jet velocity profile for slot diffusers are performed. Plane air jets are formed by linear slots or rectangular openings with a large aspect ratio. Numerical simulations are performed using the commercial computational fluid dynamics (CFD) code ANSYS FLUENT. Three plane air jet flow simulations will be investigated such as free plane (linear) jets, attached jets, and air flow through a slot diffuser in a room setting. The purpose of simulating the free plane jet through a slot diffuser is to study the

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Gadalla, M. A., and M. A. R. Sharif. "Modeling of Free Vertical Turbulent Diffusion Flames." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0088.

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Abstract A mathematical/empirical model compatible with the jet mixing theory for predicting the flow field properties, flame envelope, temperature distribution, and flame heights around a free vertical axi-symmetric turbulent diffusion flame has been developed. The model considers the effects of buoyancy force and the relative angle between the reactant jets. The flames are issued from a burner which consists of a central air jet and an annular fuel (commercial butane) jet. The annular jet is issued either vertically or at an angle to the flame axis. Experiments were performed earlier to meas

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Portaro, Rocco, and Hoi Dick Ng. "Experimental analysis of the performance of an air-powered needle-free liquid jet injector." In 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2013. http://dx.doi.org/10.1109/embc.2013.6610296.

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Menon, Shyam K., Hansen J. Jones, and Wei Zhao. "Characterization of spray structures formed during water injection into a free supersonic air jet." In AIAA Propulsion and Energy 2019 Forum. American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-4223.

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Uchiyama, Tomomi. "Numerical Simulation of Particulate Jet Generated by Free Falling Particles." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45742.

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This paper is concerned with the numerical simulation of the particulate jet generated by solid particles falling from a slit orifice into an unbounded quiescent air. A two-dimensional vortex method, proposed for the analysis of particle-laden free turbulent flow in prior papers, is employed for the simulation. The falling particles induce complicated airflow involving eddies with a wide variety of scales. The air takes its maximum velocity at the jet centerline. The particle velocity is higher than the free falling velocity of a single particle. The effects of the diameter and density of the

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Duchemin, Laurent, and Ste´phane Zaleski. "Jet Formation in Bubbles Bursting at a Free Surface." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31142.

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We study numerically bubbles bursting at a free surface. The Navier-Stokes equations with a free surface and surface tension are solved using a marker-chain approach. Initial conditions involve a bubble connected to the outside atmosphere by a preexisting opening in a thin liquid layer. The evolution of the bubble is studied as a function of bubble radius. The results show that the jet birth may occur with or without the formation of a tiny air bubble at the base of the jet. A series of critical radiuses exist, for which a transition from a dynamics with or without bubbles exist. This singular

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10

Seitz, Sara, and Lesley M. Wright. "Thermal Characterization of a Turbulent Free Jet With Planar Laser Induced Fluorescence (PLIF)." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-92058.

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Abstract Two-color, toluene based, planar laser induced fluorescence (PLIF) is utilized to characterize the thermal structure of a turbulent, free jet. The PLIF technique has been used to measure concentration gradients for combustion applications, but its use to quantify thermal gradients is limited. To validate the method, compressed air is seeded with toluene particles. The seeded airflow is heated to temperatures varying from 300–375 K, and the heated jet exits a 1.27-cm diameter orifice into quiescent, room temperature air. The jet Reynolds number is varied from 5,000 to 15,000. As the je

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