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|
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.. P. D. 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:
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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 water 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 of 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 at 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 Appendix 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 waves: 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.