Bibliografie tematiche / Confined plunging liquid jet

Letteratura scientifica selezionata sul tema "Confined plunging liquid jet"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 26 gennaio 2023

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Articoli di riviste sul tema "Confined plunging liquid jet"

Atkinson, B?W, G?J Jameson, A?V Nguyen e G?M Evans. "Increasing gas-liquid contacting using a confined plunging liquid jet". Journal of Chemical Technology & Biotechnology 78, n. 2-3 (2003): 269–75. http://dx.doi.org/10.1002/jctb.768.

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Jakubowski, Craig A., Bruce W. Atkinson, Peter Dennis e Geoffrey M. Evans. "Ozone Mass Transfer in a Confined Plunging Liquid Jet Contactor". Ozone: Science & Engineering 25, n. 1 (febbraio 2003): 1–12. http://dx.doi.org/10.1080/713610646.

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Evans, G. M., e P. M. Machniewski. "Mass transfer in a confined plunging liquid jet bubble column". Chemical Engineering Science 54, n. 21 (novembre 1999): 4981–90. http://dx.doi.org/10.1016/s0009-2509(99)00221-3.

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S. Al-Anzi, Bader. "Effect of Primary Variables on A Confined Plunging Liquid Jet Reactor". Water 12, n. 3 (10 marzo 2020): 764. http://dx.doi.org/10.3390/w12030764.

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The effects of operating conditions including a novel downcomer geometry on the gas/air entrainment rate, Qa, were investigated for a local vertical confined plunging liquid jet reactor (CPLJR) as an alternative aeration process that is of interest to Kuwait and can be used in various applications, such as in wastewater treatment as an aerobic activated sludge process, fermentation, brine dispenser, and gas–liquid reactions. Operating conditions, such as various downcomer diameters (Dc = 45−145 mm), jet lengths (Lj = 200–500 mm), nozzle diameters (dn = 3.5–15 mm), and contraction angles (Ɵ =20–80°), were investigated. A newly designed downcomer with various mesh openings/pores (Dm = 0.25ʺ (6.35 mm)–1ʺ (25.4 mm)) was also investigated in the current study. The air entrainment results showed that these were the primary parameters for the measured air entrainment rate in confined systems. The highest gas entrainment rates were achieved when the ratio of the downcomer diameter (Dc) to the nozzle diameter (dn) was greater than approximately 5, as long as the liquid superficial velocity was sufficient to carry bubbles downward. Furthermore, a downcomer with mesh openings (Dm) less or equal to 0.5ʺ (12.7 mm) provided a higher entrainment rate than that of conventional downcomer (without a mesh).

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Evans, G. M., A. K. Biń e P. M. Machniewski. "Performance of confined plunging liquid jet bubble column as a gas–liquid reactor". Chemical Engineering Science 56, n. 3 (febbraio 2001): 1151–57. http://dx.doi.org/10.1016/s0009-2509(00)00334-1.

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Al-Anzi, Bader S., e Jenifer Fernandes. "Sensitivity Test of Jet Velocity and Void Fraction on the Prediction of Rise Height and Performance of a Confined Plunging Liquid Jet Reactor". Processes 10, n. 1 (13 gennaio 2022): 160. http://dx.doi.org/10.3390/pr10010160.

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Jet velocity is an important parameter affecting the air entrainment rate of plunging liquid jet processes. While the vast majority of researchers have investigated the effect of jet velocity, only a few of them considered the effect of jet length in calculating the jet velocity at impingement point. This study investigates the difference (ΔV) between the jet velocity at the inception of the nozzle (Vj) and the impingement point (VL) for a range of operating conditions. Furthermore, bubble voidage inside the downcomer, another critical parameter in plunging jets, is estimated using three different voidage equations incorporated inside a momentum balance model to predict the two-phase elevation level (HR) inside the downcomer. Results showed that ΔV is significant (VL > Vj), especially at low jet flow rates and high jet lengths. Generally, the momentum balance model predicted the HR well, and its prediction improves with downcomer diameter. Given that, the model still needs to be refined for more accuracy for a wide range of operating conditions.

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Jakubowski, Craig A., Bruce W. Atkinson, Peter Dennis e Geoffrey M. Evans. "Ozone Mass Transfer in the Mixing Zone of a Confined Plunging Liquid Jet Contactor". Ozone: Science & Engineering 28, n. 3 (luglio 2006): 131–40. http://dx.doi.org/10.1080/01919510600609354.

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Okhotskii, V. B. "Plunging of a liquid jet into a motionless liquid". Theoretical Foundations of Chemical Engineering 34, n. 5 (settembre 2000): 496–99. http://dx.doi.org/10.1007/bf02827395.

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CLANET, C. "Plunging cavities". Journal of Fluid Mechanics 680 (18 luglio 2011): 1–4. http://dx.doi.org/10.1017/jfm.2011.168.

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When a wave breaks, the tip forms a liquid sheet which impinges the base and creates an air cavity which breaks into bubbles. Gomez-Ledesma, Kiger & Duncan (J. Fluid Mech., this issue, vol. 680, 2011, pp. 5–30) have conducted a nice experiment on this problem, enabling them to discuss both the inclination of the jet and the effect of its translation. This work has interesting links with other transient cavities.

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Zidouni Kendil, Faiza, Dana V. Danciu, Martin Schmidtke, Anis Bousbia Salah, Dirk Lucas, Eckhard Krepper e Amina Mataoui. "Flow field assessment under a plunging liquid jet". Progress in Nuclear Energy 56 (aprile 2012): 100–110. http://dx.doi.org/10.1016/j.pnucene.2011.12.009.

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Più fonti

Tesi sul tema "Confined plunging liquid jet"

Low, Kueng-Chang. "Hydrodynamics and mass transfer studies of a confined plunging jet". Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/35026.

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A confined plunging jet may be used as an energy efficient means of entraining a gas into a liquid for mass transfer. The application of such a jet as a wastewater oxygenator has been described. A literature survey of both the theoretical and experimental reports relevant to the hydrodynamics and mass transfer characteristics of both unconfined and confined plunging liquid jets systems, has been presented. The objective of the present study is to develop a better understanding of the confined plunging liquid jets, as a contribution towards establishing its future use as an oxygenator, especially in wastewater treatment. The effects of the three main operating variables investigated are the jet Reynolds number ReN, jet length to nozzle inside diameter ratio Lj/DN and the nozzle inside diameter DN. The effect of the downcomer size Dc on the hydrodynamics properties include the gas entrainment rates was also examined. Desirable effects on the hydrodynamics, with increasing operating variables have been obtained.

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Sofolarin, Adeniyi Babatunde. "A study of the high turbulence plunging jet reactor". Thesis, University of Bradford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280609.

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Al-Anzi, Bader. "Performance of a novel confined plunging jet reactor incorporating an annular air lift column". Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/36129.

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In this thesis experiments were carried out to achieve the desired objectives of investigating the performance of a novel confined plunging liquid jet reactor incorporating an annular riser. Air entrainment measurements were made using different confining tubes and the induced flow in the annular tube surrounding the confining tube was measured. The oxygen transfer achieved was also determined and compared with other contacting devices. A literature survey regarding the theoretical and experimental work relevant to unconfined and confined systems, air-lift column and mass transfer has been carried out. The experiments include novel equipment utilized to make the lab measurements including air entrainment and novel air-lift column measurements. The theoretical part of the thesis contains a new model derivation to predict the liquid flow rate in the annular riser, which compares well with the experimental measurements. The objective of the first pilot plant experiments is to make air entrainment rate measurements and to investigate the effect of main variables on air entrainment rate. This enables the research to develop a better understanding of the Confined Plunging Liquid Jet Reactor (CPLJR) as an aeration process, of interest of Kuwait Institute for Scientific Research (KISR) and Kuwait, that can be used in various systems such as wastewater treatment as an aerobic activated sludge process, fermentation and gas-liquid reactions.

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Lallave-Cortes, Jorge C. "Numerical heat transfer during partially-confined, confined, and free liquid jet impingement with rotation and chemical mechanical planarization process modeling". [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0002968.

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Elsheikh, Mutasim Mohamed Sarour. "Numerical Simulations of Heat Transfer Processes in a Dehumidifying Wavy Fin and a Confined Liquid Jet Impingement on Various Surfaces". Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3090.

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This thesis consists of two different research problems. In the first one, the heat transfer characteristic of wavy fin assembly with dehumidification is carried out. In general, fin tube heat exchangers are employed in a wide variety of engineering applications, such as cooling coils for air conditioning, air pre-heaters in power plants and for heat dissipation from engine coolants in automobile radiators. In these heat exchangers, a heat transfer fluid such as water, oil, or refrigerant, flows through a parallel tube bank, while a second heat transfer fluid, such as air, is directed across the tubes. Since the principal resistance is much greater on the air side than on the tube side, enhanced surfaces in the form of wavy fins are used in air-cooled heat exchangers to improve the overall heat transfer performance. In heating, ventilation, and air conditioning systems (HVAC), the air stream is cooled and dehumidified as it passes through the cooling coils, circulating the refrigerant. Heat and mass transfer take place when the coil surface temperature in most cooling coils is below the dew point temperature of the air being cooled. This thesis presents a simplified analysis of combined heat and mass transfer in wavy-finned cooling coils by considering condensing water film resistance for a fully wet fin in dehumidifier coil operation during air condition. The effects of variation of the cold fluid temperature (-5˚C - 5˚C), air side temperature (25˚C - 35˚C), and relative humidity (50% - 70%) on the dimensionless temperature distribution and the augmentation factor are investigated and compared with those under dry conditions. In addition, comparison of the wavy fin with straight radial or rectangular fin under the same conditions were investigated and the results show that the wavy fin has better heat dissipation because of the greater area. The results demonstrate that the overall fin efficiency is dependent on the relative humidity of the surrounding air and the total surface area of the fin. In addition, the findings of the present work are in good agreement with experimental data. The second problem investigated is the heat transfer analysis of confined liquid jet impingement on various surfaces. The objective of this computational study is to characterize the convective heat transfer of a confined liquid jet impinging on a curved surface of a solid body, while the body is being supplied with a uniform heat flux at its opposite flat surface. Both convex and concave configurations of the curved surface are investigated. The confinement plate has the same shape as the curved surface. Calculations were done for various solid materials, namely copper, aluminum, Constantan, and silicon; at two-dimensional jet. For this research, Reynolds numbers ranging from 750 to 2000 for various nozzle widths channel spacing, radii of curvature, and base thicknesses of the solid body, were used. Results are presented in terms of dimensionless solid-fluid interface temperature, heat transfer coefficient, and local and average Nusselt numbers. The increments of Reynolds numbers increase local Nusselt numbers over the entire solid-fluid interface. Decreasing the nozzle width, channel spacing, plate thickness or curved surface radius of curvature all enhanced the local Nusselt number. Results show that a convex surface is more effective compared to a flat or concave surface. Numerical simulation results are validated by comparing them with experimental data for flat and concave surfaces.

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Evans, Geoffrey Michael. "A Study of a Plunging Jet Bubble Column". Thesis, 1990. http://hdl.handle.net/1959.13/24721.

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The hydrodynamic phenomena occurring inside the enclosed downcomer section of a plunging jet bubble column are described in the study. The gas entrainment rate for a plunging liquid jet was found to consist of two components, namely the gas trapped within the effective jet diameter at the point of impact, and the gas contained within the film between the jet and induction trumpet surface at the point of rupture. Entrainment within the effective jet diameter has been examined by McCarthy (1972). In this study, a model was supported by the experimental results, provided the film attained a region of constant thickness. When the induction trumpet was ruptured prior to a constant film thickness being reached, the measured rate of filmwise entrainment was higher than the prediction. Filmwise entrainment was found to be initiated once a critical velocity along the surface of the induction trumpet was reached. The critical velocity was a function only of the liquid physical properties and was independent of the jet conditions and downcomer diameter. The velocity of the free surface of the induction trumpet was obtained from the velocity profile for the recirculating eddy generated by the confined plunging liquid jet. The jet angle used to describe the expansion of the submerged jet inside the downcomer was predicted from the radial diffusion of jet momentum into the recirculation eddy. The model was able to predict the jet angle when it was assumed that the radial diffusion of jet momentum was a function of the Euler number based on the jet velocity and absolute pressure in the headspace at the top of the downcomer. The model was also developed to predict the maximum stable bubble diameter generated within the submerged jet volume, where the energy dissipation attributed to bubble breakup was given by the energy mixing loss derived for the throat section of a liquid-jet-gas-pump. Good agreement was found between the measured and predicted maximum bubble diameter values. The average experimental Sauter mean/maximum diameter ratio was found to be 0.61, which was similar to that for other bubble generation devices. It was found that for turbulent liquid conditions in the uniform two-phase flow region, a transition from bubble to churn-turbulent flow occurred at a gas void fraction of approximately 0.2 when the gas drift-flux was zero. Under laminar liquid flow, this transition took place at a gas void fraction above 0.3. For the bubbly flow regime the Distribution parameter Co used by Zuber and Findlay (1965) to describe the velocity and gas void fraction profile, was found to be a function of the liquid Reynolds number. For laminar liquid flow, values of Co greater than unity were obtained. As the liquid Reynolds number was increased it was found that Co decreased, until a constant value of unity was obtained for fully turbulent flow. For the churn-turbulent regime it was found that the gas void fraction measurements for all of the experimental runs could be collapsed onto a single curve when a modified gas void fraction was plotted against the gas-to-liquid volumetric flow ratio. The modified gas void fraction included a correction factor to account for the difference in the bubble slip velocity between the experimental runs. The experimental results also indicated that the value of the constant in the gas void fraction correction factor was different for laminar and turbulent flow. Prior to bubble coalescence, it was found that the experimental drift-flux curves could be predicted from the measured bubble diameter, using the separated flow model development by Ishii and Zuber (1979). After the onset of coalescence the drift flux measurements departed from the original drift-flux curves at a rate which increased linearly with increasing gas void fraction. It was found that the slope of the line fitted to the coalesced region of the drift-flux curves increased with increasing liquid Reynolds number and reached a constant value under fully turbulent flow conditions. The model developed, together with the implications of the experimental results, are discussed with regard to optimising the design of an industrial plunging jet bubble column.
PhD Doctorate

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Mishra, A. "Numerical and experimental investigation of a confined plunging liquid jet system". Thesis, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7302.

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In a confined plunging liquid jet (CPLJ) system, a liquid jet is allowed to fall in a partially submerged narrow downcomer tube. Liquid jet impingement at gas-liquid interface leads to entrainment of gas, which is dispersed down the downcomer tube in to outer pool in form of bubbles. This simple phenomenon of gas entrainment bears great industrial significance. It facilitates an efficient gas liquid contacting device, which can be used for waste water aeration and lake destratification etc. In present work, a confined plunging liquid jet system was experimentally and numerically analyzed. On experimental front, a laboratory scale CPLJ setup was developed. Impact of change in jet height, water flow rate and nozzle diameter on, bubble plume size and surrounding flow field was investigated through high speed camera photography and Particle Image Velocimetry. Image processing programs were developed in MATLAB for extracting plume boundaries in high speed camera images. Experimental results showed that, bubble plume width and flow field is only weakly dependent on jet height. With increase in water flow rate, bubble plume size and air lifted water velocity increases. Increase in nozzle diameter, at constant water flow rate and jet height, decreases both the plume size and upward water velocity. On numerical front, a 3D Euler-Euler two-fluid CFD simulation of bubble plume dispersion was performed for the test case of 7 mm nozzle diameter, 100 mm jet length and 12.5 LPM water flow rate. Grid generation was done in GAMBIT while CFD software ANSYS CFX 12.1 was used for CFD simulations. Air phase was modelled as a polydispersed fluid with eight size bins. In CFD modelling, interfacial drag, lift, wall lubrication and turbulent dispersion forces were incorporated through appropriate correlations. Numerical and experimental results were found to be in agreement with each other. CFD results showed that at least 85% of the inlet air breaks thorough the downcomer tube in to outer water tank

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Evans, Geoffrey Michael. "A Study of a Plunging Jet Bubble Column". Diss., 1990. http://hdl.handle.net/1959.13/24721.

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Libri sul tema "Confined plunging liquid jet"

Chin-Shun, Lin, e United States. National Aeronautics and Space Administration., a cura di. Axisymmetric confined turbulent jet directed towards the liquid surface from below. [Washington, D.C.]: National Aeronautics and Space Administration, 1989.

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Capitoli di libri sul tema "Confined plunging liquid jet"

Evans, G. M., W. P. Mao e G. J. Jameson. "Mass Transfer in a Plunging Liquid Jet". In Mixing and Crystallization, 75–82. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2290-2_7.

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Fukuda, Kazuma, Koichi Hishida e Masanobu Maeda. "Transition Process of Laminar Confined Jet in Solid-Liquid Two-Phase Flow". In Instabilities in Multiphase Flows, 321–31. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4899-1594-8_27.

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Atti di convegni sul tema "Confined plunging liquid jet"

Krepper, Eckhard, Frank-Peter Weiss, So¨ren Alt, Alexander Kratzsch, Stefan Renger e Wolfgang Ka¨stner. "Some Nuclear Reactor Safety Related Aspects of Plunging Jets". In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29951.

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Plunging jets play an important role in nuclear reactor safety research. In the present paper the case of the strainer clogging issue is considered. Entrained air caused by a plunging jet has an influence of the liquid flow field and on the fibre transport in the sump. In the paper the amount of entrained air is given as an inlet boundary condition according to correlations in the literature and confirmed by own experiments. The influence of entrained air on the fibre deposition pattern at the bottom of a tank and on the mixing procedure for the case of temperature differences between jet and tank water are investigated by CFD calculations and compared to experiments. The presented work is part of a joint research project performed in cooperation between the University of Applied Science Zittau/Go¨rlitz and Forschungszentrum Dresden-Rossendorf. The project deals with the experimental investigation of particle transport phenomena in coolant flow in Zittau and the development of CFD models for its simulation in Rossendorf (Krepper et al. 2008).

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Pillers, Roy A., e Theodore J. Heindel. "Backlit Imaging of a Circular Plunging Jet With Floor Interactions". In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20040.

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Abstract Plunging jets occur when a liquid stream enters a slower moving or stationary liquid body after first passing through a gaseous region. The most commonly studied plunging jet structure is that of water entering water. Plunging jets have been studied in order to understand and model mixing and transport from the atmosphere into the liquid. Shear forces at the edge of the jet cause air entrainment both in the free jet and at the impact point on the pool surface. Plunging jet applications range from large scale environments, such as ocean waves, waterfalls, wastewater treatment, and dams, to small scale environments, such as liquid-gas fuel mixing, mineral separation, and molten metal pouring. The majority of the literature today involve facilities designed to approximate an infinite liquid pool; few of these studies take into account the compression effects prevalent in several of the real systems. Therefore, a tank has been developed for the visualization of plunging jet flows with varying pool depth. This study involved the creation of a 32 cm by 32 cm, 91.4 cm deep rectangular acrylic tank with an interior adjustable acrylic bottom for the visualization of plunging jet flows with bottom compression effects. The pool height was held constant using a secondary tank with an overflow weir. In this study high-speed backlit images were taken of the plunging jet region. Preliminary results indicate that there is a significant change in both the shape and estimated entrained air volume when the plunging jet is subjected to compression effects. This is attributed to the plate spreading the bubble plume and allowing for easier bubble rise.

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Sivaiah, Mekala, Rajeev Parmar e Subrata Kumar Majumder. "Energy efficiency of gas-liquid-solid mixing in a plunging liquid jet slurry bubble column". In 2012 1st International Conference on Power and Energy in NERIST (ICPEN). IEEE, 2012. http://dx.doi.org/10.1109/icpen.2012.6492345.

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Krueger, Paul S., Razvan Bidoae e Peter E. Raad. "Simulation of Air Entrapment by a Plunging Liquid Jet of Finite Length". In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56291.

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The impingement of a finite length round water jet on a large pool of water was simulated numerically using a 3D Eulerian-Lagrangian Marker and Micro-Cell (ELMMC) method. The method allowed simulation of the initial impact of the jet on the pool surface, the deformation of the pool surface by the falling jet, and, under certain conditions, the entrapment of an air bubble as the pool closes in on the jet. The conditions considered were for ratios of jet length to radius (h/r) in the range of 4 to 25 and jet Froude number in the range of 16 to 74. The results agreed with previous experimental observations by Oguz et al. (J. Fluid Mech., 294, 1995) in terms of entrapped air volume and the possible geometries of entrapped bubbles (viz., toroidal or spheroidal). The simulation results also allowed for a detailed study of effects difficult to discern experimentally, such as vorticity generation and differences in entrapped air volume between toroidal and spheroidal bubbles.

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Lallave, Jorge, e Muhammad Rahman. "Cooling of a Spinning Disk by Confined Liquid Jet Impingement". In 3rd International Energy Conversion Engineering Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-5681.

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Ma, Jingsen, Assad A. Oberai, Donald A. Drew e Richard T. Lahey. "A Two-Way Coupled Polydispersed Simulation of Bubbly Flow Beneath a Plunging Liquid Jet". 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-icnmm2010-30573.

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Plunging liquid jets are commonly encountered in nature and are widely used in industrial applications (e.g., in waterfalls, waste-water treatment, the oxygenation of chemical liquids, etc.). Despite numerous experimental studies that have been devoted to this interesting problem, there have been very few two-phase flow simulations. The main difficulty is the lack of a quantitative model to simulate the air entrainment process, which plays a critical role in this problem. In this paper, we present a computational multiphase fluid dynamics (CMFD) approach for solving this problem. The main ingredients of this approach are a comprehensive subgrid air entrainment model that predicts the rate and location of the air entrainment and a two-fluid transport model in which bubbles of different sizes are modeled as a continuum fluid. Using this approach, a Reynolds-averaged Navier Stokes (RaNS) two-way coupled two-phase flow simulation of a plunging liquid jet with a diameter of 24mm and a liquid jet velocity around 3.5m/s was performed. We analyzed the simulated void fraction and bubble count rate profiles at three different depths beneath the average free surface, and compared them with experimental data. We observed good agreement at all locations.

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Mead, Ryan M., e Muhammad M. Rahman. "Transient Thermal Management Using a Confined Jet Impingement of Liquid Ammonia". In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55001.

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This paper introduces the results of transient heat transfer involving a jet of liquid ammonia perpendicularly on a solid substrate of finite thickness containing discrete electronic sources on the opposite surface. The jet was confined by using a cover plate to prevent any evaporation or loss of ammonia during the heat transfer process. The numerical simulation considered both the solid and fluid regions as a conjugate problem. The equations solved in the liquid region included the conservation of mass, conservation of energy, and conservation of momentum. For the solid region, only the heat conduction equation was solved. Computed results included the temperature distribution, local and average heat transfer coefficient, and local and average Nusselt number at the solid-fluid interface. Some of the parameters such as the jet velocity, plate thickness, and plate material were altered to examine the effect that they had on the problem. It was found that the average heat transfer coefficient and a average Nusselt number were high at the initial stages of the transient process and decreased steadily with time until it reached the steady condition. As the plate thickness decreased, and as the jet velocity increased, it was observed that the time it took to reach the steady state condition declined. The time it took to reach steady state condition did not change significantly for different plate materials. However, it did change noticeably for different plate thickness and different Reynolds number.

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HASAN, MOHAMMAD, e CHIN-SHUN LIN. "Axisymmetric confined turbulent jet directed towards the liquid surface from below". In 27th Aerospace Sciences Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-172.

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Rahman, Muhammad M., e Santosh K. Mukka. "Confined Liquid Jet Impingement on a Plate With Discrete Heating Elements". In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72408.

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The primary focus of this paper is the conjugate heat transfer during vertical impingement of a two-dimensional (slot) submerged confined liquid jet using liquid ammonia as the working fluid. Numerical model for the heat transfer process has been developed. The solid region has been modeled along with the fluid region as a conjugate problem. Discrete heat sources have been used to study the overall effect on convective heat transfer. Simulation of discrete heat sources was done by introducing localized heat fluxes at various locations and their magnitudes being varied. Simulations are performed for two different substrate materials namely silicon and stainless steel. The equations solved in the liquid region included the conservation of mass, conservation of momentum, and conservation of energy. In the solid region, only the energy equation, which reduced to the heat conduction equation, had to be solved. The solid-fluid interface temperature showed a strong dependence on several geometric, fluid flow, and heat transfer parameters. The Nusselt number increased with Reynolds number. For a given flow rate, a higher heat transfer coefficient was obtained with smaller slot width and lower impingement height. For a constant Reynolds number, jet impingement height and plate thickness, a wider opening of the slot provided higher average heat transfer coefficient and higher average Nusselt number. A higher average heat transfer coefficient was seen at a smaller thickness, whereas a thicker plate provided a more uniform distribution of heat transfer coefficient. Higher thermal conductivity substrates also provided a more uniform heat distribution.

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Lallave, Jorge, e Muhammad M. Rahman. "Thermal Transport From a Rotating Disk During Partially Confined Liquid Jet Impingement". In ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36188.

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This paper presents a numerical study that characterizes the conjugate heat transfer results of a semi–confined liquid jet impingement on a uniformly heated spinning solid disk of finite thickness and radius. The model covers the entire fluid region including the impinging jet on a flat circular disk and flow spreading out downstream under the confined insulated wall that ultimately gets exposed to a free surface boundary condition. The solution is made under steady state and laminar conditions. The model examines how the heat transfer is affected by adding a secondary rotational flow under semi-confined jet impingement. The study considered various standard materials, namely aluminum, copper, silver, Constantan and silicon; covering a range of flow Reynolds number (220–900), under a broad rotational rate range from 0 to 750 rpm, or Ekman number (7.08×10−5 – ∞), nozzle to target spacing (β = 0.25 – 1.0), disk thicknesses to nozzle diameter ratio (b/dn = 0.25 – 1.67), Prandtl number (1.29 – 124.44) using ammonia (NH3), water (H2O), flouroinert (FC-77) and oil (MIL-7808) as working fluids and solid to fluid thermal conductivity ratio (36.91 – 2222). High thermal conductivity plate materials maintained more uniform and lower interface temperature distributions. Higher Reynolds number increased local heat transfer coefficient reducing the interface temperature difference over the entire wall. Rotational rate increases local heat transfer coefficient under most conditions. These findings are important for the design improvement and control of semi-confined liquid jet impingement under a secondary rotation induced motion.

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Rapporti di organizzazioni sul tema "Confined plunging liquid jet"

RENSSELAER POLYTECHNIC INST TROY NY. An Experimental Study of Plunging Liquid Jet Induced Air Carryunder and Dispersion. Fort Belvoir, VA: Defense Technical Information Center, marzo 1992. http://dx.doi.org/10.21236/ada248315.

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Bonetto, F., D. A. Drew, R. T. Lahey e Jr. An Analysis of Pool Surface Deformation Due to a Plunging Liquid Jet. Fort Belvoir, VA: Defense Technical Information Center, giugno 1992. http://dx.doi.org/10.21236/ada253843.

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Bonetto, F., D. A. Drew, Richard T. Lahey e Jr. An Analysis of Pool Surface Deformation Due to a Plunging Liquid Jet. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1993. http://dx.doi.org/10.21236/ada272970.

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