2 edition of study of air entrainment using plunging water jets. found in the catalog.
study of air entrainment using plunging water jets.
Eamon Joseph McKeogh
Written in English
Thesis (Ph.D.)--The Queen"s University of Belfast, 1978.
|The Physical Object|
What was needed was to make a survey of the situation, and this was the principal aim of the NATO Advanced Study Institute on Recent Advances in Hydraulic Physical Modelling, which took place on the premises of the Laborat6rio Nacional de Engenharia Civil (LNEC) in Lisbon, Portugal, from 4th to 15th July , and of which this book is one of. FLUIDIC VORTEX BUBBLE GENERATOR by BOWLES FLUIDICS CORPORATION Fraser Avenue Silver Spring, Maryland for the ENVIRONMENTAL PROTECTION AGENCY Program Number FEB Contract Number February, For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, B.C. - Price $ action New Frontiers, Plunging water jet system using inclined short nozzles for aerobic treatment of wastewater J12 Aeration for biological treatment and removal of dissolved orgumc matter Experimental Unknown Organics No Further , 19( dams and cooling-water intakes (92). For example, lights, air bubbles, and electrical screens have all 34 Fish Passage Technologies: Protection at Hydropower Facilities of this chapter for more details on turbine mortal-ity studies). been employed to study entrainment at hydro-power dams. The diversity in File Size: 1MB.
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The phenomenon of air entrainment by water jet plunging on the free surface of a water pool is reported in the paper. An effort has been made to understand the physics of the phenomenon through. One type of air-water shear flows is the developing flow region of a plunging jet.
The mechanisms of air entrainment by plunging liquid jets are discussed in the light of new experimental evidence. Then the air bubble diffusion is analyzed analytically in the near-flow field of both circular and two-dimensional plunging by: Study of Air Entrainment by a Horizontal Plunging Liquid Jet experimental data for water jets in air over a wide range of liquid velocities (from around 1 to 10 m/s) for the total rate of air.
Air entrainment: Air entrainment is an effective way of protecting concrete from freezing and thawing is achieved by adding a surface active agent in very small dosages to the concrete mixture. This action creates a large number of small, closely spaced air bubbles in the hardened concrete.
Air entrainment occurs when two or more flowing fluids plunge into each other, or when some sort of turbulence is introduced in a water body.
In this study, experiments were conducted to explore some properties of bubble plumes of two inclined circular plunging water jets on a study of air entrainment using plunging water jets. book surface in a cubic tank utilizing particle image velocimetry Author: M. Baawain, M. Gamal El-Din, D.
Smith. Void fractions and bubble count rates were measured in the developing shear layer study of air entrainment using plunging water jets. book a large-size plunging jet d 1 = 25 mm. The data compared well with a solution of an advective diffusion equation and showed an increased air entrainment rate with increasing free-jet length for x 1 / d 1 ⩽ Cited by: At a plunging jet, air entrainment takes place when the jet impact velocity V 1 exceeds a critical threshold, called onset or inception velocity.
For rough turbulent jet flows, the inception velocity V e is about 1 m/s for a vertical jet discharging into fresh water and sea water (paragraph ). Cummings and H. Chanson, “An experimental study of individual air bubble entrainment study of air entrainment using plunging water jets.
book a planar plunging jet,” Chem. Eng. Research and Design, Trans. IChemE, Part A 77, (). Google Scholar; 7. El Hammoumi, “Entraînement d’Air par Jet Plongeant : H. Chanson. Plunging jet flow patterns and air entrainment inception 35 5. Air-water flow properties in the plunge pool 69 6.
Conclusion 7. Acknowledgments APPENDICES Study of air entrainment using plunging water jets. book A - Air bubble diffusion at vertical plunging jets and high-velocity water jets: a review A-1Author: Numa J.
Bertola, Hang Wang, Hubert Chanson. "Air Entrainment by Two-Dimensional Plunging Jets: the Impingement Region and the Very-Near Flow Field." Proc. ASME Fluids Eng.
Conf., FEDSM'98, Washington DC, USA, JunePaper FEDSM, 8 pages (CD-ROM) (ISBN 0 7). (download PDF file) Studies of air entrainment at circular plunging jets include. Publications derived from the project. CUMMINGS, P.D., and CHANSON, H. ()."An Experimental Study of Individual Air Bubble Entrainment at a Planar Plunging Jet." Chem.
Eng. Research and Design, Trans. IChemE, Part A, Vol. 77, No. A2, pp. (ISSN ).(download PDF file)CUMMINGS, P.D. "The Growth of Wind Waves Estimated using a New Irrotational Finite Amplitude Water. Abstract. Free surface penetration by plunging water gives rise to air entrainment and transport of bubbles in the submerged flows.
Photography has revealed the bubbles are initially transported in Cited by: Deane and Stokes suggested that the following two mechanisms are sources of air entrainment in plunging study of air entrainment using plunging water jets.
book first, smaller bubbles less than 1–2 mm in diameter are formed by the impact and subsequent splashing of the overturning jet and in the shear layer between the jet and the water in the trough region in front of the breaking wave Cited by: Data on bubble entrainment and comminution are gathered in three experiments, involving the breakup of a disk of air trapped between two plates, and bubble cloud generation under a waterfall, and a plunging jet.
In the second two cases, an automated acoustic system for characterizing the entrainment is employed. The data sets are compared with an existing theory for bubble fragmentation, in Cited by: This book comprises the papers of the International Conference on Hydraulics of Dams and Rivers Structures, held in Tehran, April The topics covered include air-water flows, intakes and outlets, hydrodynamic forces, energy dissipators, stepped spillways, scouring and sedimentation around structures, numerical approaches in river hydrodynamics, river response to hydraulic structures.
"Air Entrainment by Two-Dimensional Plunging Jets: the Impingement Region and the Very-Near Flow Field." Proc. ASME Fluids Eng. Conf., FEDSM'98, Washington DC, USA, JunePaper FEDSM, 8 pages (ISBN 0 7).
Davoust, J.L. Achard and M. El Hammoumi, Air entrainment by a plunging jet: the dynamical roughness concept and its estimation by a light absorption technique, International Journal of Multiphase Flow, 28, 9, (), ().
A recent review of studies of air entrainment created by plunging jets from a nozzle and a breaking wave has shown “qualitatively different types of impact”. We utilize a steady plunging jet to produce bubble clouds because we are interested in the underwater bubble population rather than the impact of the jet on the water or the mechanism Cited by: 5.
Study of air entrainment and air-water flows in hydraulics structures, hydraulic systems, re-aeration plants and water treatment systems. Tidal bores A tidal bore is a surge of water propagating upstream in an estuarine zone when the tidal flow turns to rising and rushes into a.
Hydraulic jumps have been the object of extensive experimental investigation, providing the numerical community with a complete case study for models’ performance assessment. This study constitutes an exhaustive literature review on hydraulic jumps’ experimental datasets.
Both mean and turbulent parameters characterising hydraulic jumps are comprehensively discussed, presenting at least a Cited by: 5. The air entrainment process at the top of the downcomer is facilitated by a mixing head. At the bottom of the downcomer, the bubbles are separated from the flow in a separator vessel.
The objective of this thesis is to develop the design methodology for the air entrainment and air-water separation components on either end of the downcomer process. Here, ω f is the forcing frequency, f is the forcing amplitude.
Subsequently, we use 1/k=λ/2π as the length scale and as the time scale, where λ is the characteristic wave length and g is the gravitational acceleration. In equation (3), ω i is the natural frequency for the ith spatial mode with wavenumber k i =i and dimensionless capillary number κ=σk 2 /ρg.
Singular air entrapment at vertical and horizontal supported jets: plunging jets versus hydraulic jumps. Abstract: In plunging jets and at hydraulic jumps, large amounts of air bubbles are entrained at the impingement of the liquid jet into the receiving body.
Air is entrapped and advected into a turbulent shear layer with strong interactions between the air bubble advection process and. water science and technology, / () 'air entrainment rate and diffusion pattern of plunging liquid jets' mckeogh, ej and ervine, da; () 'air entrainment rate and diffusion pattern of plunging liquid jets'.
chemical engineering science, 36 (7) () 'air retained in pool by plunging water jet'. Most mist-extractor capacity information is based on low-pressure air/water tests, which do not scale up well to real-world conditions.
Liquid handling. This refers to the amount of entrained liquid load (gal/min/ft 2) that the mist extractor can handle before separation performance is substantially degraded (usually because of re-entrainment).
Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF. Mäkiharju, S.A. and Ceccio, S.L., “Experimental Study on the Formation an Air Layer with Gas Injection from Discrete Sources.” 31 st Symposium on Naval Hydrodynamics, September 11 th.
where Q = air entrainment rate in cubic meters per second, q = weir discharge in cubic meters per second, and h = drop height in meters.
Cummings, and H. Chanson () reported a broad range for the size of the bubble entrainment by plunging jets, but they are mostly larger than 1 mm at a jet velocity of 2 – 8 m ∕ s when the jet is plunging into the water.
Chanson, H. Toombes, L. Air- Water flows down stepped chutes: Turbulence and flow structure observations, doi: /S(02) The University of Alberta Faculty of Engineering conducts leading-edge, interdisciplinary research and is awarded more than $65 million in research funding per year.
Y.Y., Zhu, D.Z., Rajaratnam, N. (), “Air entrainment in a tall plunging flow dropshaft”, ASCE Journal of Hydraulic Engineering, (10):11p. “Far-Field. All the simulations are performed on a water jet of R = × 10 −6 m, with ρ = kg m −3, μ = 10 −3 N s m −2 and σ = N m −1.
The simulations are 3D and are performed using isotropic hexahedral meshes with Δx = × 10 −6 m in the region occupied by theCited by: Book series; Subjects. All Subjects; Buildings and structures; Coastal and offshore engineering; Development, planning and urban engineering; Energy; Geology, geotechnical and ground engineering; Health and safety; Law and contracts; Leadership and management; Professional development; Science; Transportation; Water engineering and wastewater.
Kiger KT, Duncan JH () Air-entrainment mechanisms in plunging jets and breaking waves. Annu Rev Fluid Mech – MathSciNet CrossRef Google Scholar Kim D-G () Numerical analysis of free flow past a sluice by: 4.
A study into maritime collision probability 41 Student: L.A. Pimontel Container terminal automation Feasibility of terminal automation for mid-sized terminals 42 Student: W.C.A. Rademaker Air entrainment with plunging jets 43 Student: A.
Smit Wave overtopping aspects of File Size: 5MB. To date, information regarding the behavior of air-water flows in the plunge pool of free-falling jets is scarce. This study combines experimental and numerical approaches to analyze the submerged hydraulic jump generated downstream of overflow nappe impinging jets.
A back-flushing Pitot tube and an optical probe were used to measure the. mesh refinement. Deshpande et al. () investigated a circular water jet plunging into a quiescent pool at shallow inclination employing the interFoam solver of OpenFoam together with VOF.
All of the above numerical studies are based on grid system. Another alternative tool to study the jet impingement flows in CFD field is the meshless.
Plunging to spilling transition in corner surface waves in Published by Guset User, Description: RESEARCH ARTICLE Plunging to spilling transition in corner surface waves in the wake of a partially submerged vertical plate P.
Martı´nez-Legazpi • J. Rodrı. Advances in Coastal and Ocean Engineering. Interaction of Strong Turbulence with Free Surfaces. https: This book is a useful source of ideas and information for scientists whose work involves understanding and modelling turbulent flows with free surfaces.
Entrainment Mechanisms and Air-Water Flow Structure at the “Pseudo” Free. Environmental Hydraulics is a new text for students and professionals studying advanced topics in river and estuarine systems. The book contains the full range of subjects on open channel flows, including mixing and dispersion, Saint-Venant equations method of characteristics and interactions between flowing water and its surrondings (air entrainment, sediment transport).Following the approach.
The benefits and liabilities of high-speed skimmers and specialized boom systems are reviewed for fast water conditions. Promising deflection strategies are shown. Alternate containment and diversion techniques, including pneumatic boom, horizontal air and water jets, plunging water jets, diversion paravanes, and floating paddle wheels, are.
Below is a collection of pdf papers in our Water pdf Environmental Bibliography. All of these papers feature FLOW-3D more about how FLOW-3D can be used to successfully simulate applications for the Water & Environmental Industry.
Hamidreza Samma, Amir Khosrojerdi, Masoumeh Rostam-Abadi, Mojtaba Mehraein and Yovanni Cataño-Lopera, Numerical simulation of .Fundamentals of the hydrodynamic mechanism of splitting in dispersion processes.
J. O. Hinze. Kuang‐An Chang, Zhi‐Cheng Huang and Ho‐Joon Lim, Turbulent flow field and air entrainment in laboratory plunging breaking waves, A numerical study on water wetting associated with the internal corrosion of oil.3- Modelling of urban structures and specific elements using either CFD or ebook facilities.
4- Measurement of air-entrainment in complex flow structures such as hydraulic jumps, stepped spillways, etc. 5- Measures to provide more Flood Resilient Cities.
6- Hydrological Studies of Wind-Driven Rainfall using scaled models.