2 edition of Gas bubble entrainment by plunging laminar liquid jets found in the catalog.
Gas bubble entrainment by plunging laminar liquid jets
T. J. Lin
Written in English
|Statement||by T.J. Lin.|
Detsch RM, Sharma RN () The critical angle for gas bubble entrainment by plunging liquid jets. Chem Eng J Google Scholar; Bin AK () Gas entrainment by plunging liquid jets. Chem Eng Sci Google Scholar; Cummings PD, Chanson H () Air entrainment in the developing flow region of plunging Jets-Part 1. Evans, G. M., and G. J. Jameson, “Prediction of the Gas Film Entrainment Rate for a Plunging Liquid Jet Reactor.” Proceedings of the AlChE Symposium on Multiphase Reactors. Guha, A., R. M. Barron, and R. Balachandar. “Numerical Simulation of High-Speed Turbulent Water Jets in Air.” Journal of Hydraulic Research 48 (1): –
There has, however, been research performed on the amount of gas entrained into a pool of liquid caused by a plunging liquid jet (the waterfall effect, as shown in Fig. 7), which can be significant. Less work has been performed on quantification of the bubble size distribution associated with the entrained gas, but there is some guidance in. Gas entrainment by plunging liquid jets. Chem. Eng. Sci. – Presents a comprehensive review through date of publication, covering jet breakup lengths, entrainment limit correlations, volume entrainment rates, bubble dispersion, and gas/liquid mass transfer. Crossref; Web of Science ® Google Scholar.
In the plunging jet system, a jet of liquid while plunging into a pool of the same liquid carries along with it some ambient gas, which disperses into bubbles due to momentum transfer of the jet. The liquid and gas bubbles move down through the liquid pool to some distance and the gas bubbles then move up. This book develops an analysis of the air entrainment processes in free-surface flows. These flows are investigated as homogeneous mixtures with variable density. Several types of air-water free-surface flows are studied: plunging jet flows, open channel flows, and turbulent water jets discharging into air.
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A free, vertical jet of liquid plunging into a uiescent surface of the same liquid entrains the surrounding gas into the receiving liquid to form bubbles.
The entrainment characteristics of such jets of Newtonian liquids of varying physical properties have been investigated by means of high‐speed photography.
Although both laminar and Cited by: Journals & Books; Help Review article number Gas entrainment by plunging liquid jets. gas holdup and bubble residence time) and mass transfer.
Wherever possible, empirical correlations enabling estimation of the relevant quantities characterizing the entrainment phenomenon studied are given or recommended.
Practical applications of Cited by: 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.
The gas entrainment by a plunging liquid jet may occur in many problems of practical interest. A good understanding of the air carryunder and bubble dispersion process associated with a plunging liquid jet is vital if one is to be able to quantify such phenomena as sea surface chemistry, the meteorological and ecological significance of (breaking) ocean waves, the.
The gas holdup and gas entrainment of a plunging liquid jet with a gas entrainment guide in an air-water system was investigated. Gas Bubble Entrainment by Plunging Laminar Liquid Jets. 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 ⩽ 1.
Lin and H. Donnelly, “ Gas bubble entrainment by plunging laminar liquid jets,” AIChE J. 12, (). Google Scholar Crossref; 2. Sene. Small, coherent structures like these are reminiscent of the sheath of air created by a plunging, laminar liquid jet (Lin and Donnelly ; McKeogh and Ervine ).
Such structures are not expected to be stable, and there is evidence in region II that the ultimate fate of the filaments is to fragment into small bubbles.
Air entrainment due to a translating axisymmetric laminar water jet plunging into an otherwise quiescent pool of water was studied experimentally.
The jet impact diameter, D j, and velocity, V j, ranged from to cm and to cm/s, respectively. For all of these jet flow conditions, the water surface around the jet impact site of the stationary jet is smooth.
In agreement with the observations of McKeogh & Ervine (), different two-phase jet characteristics were noted, depending on the turbulence intensity of the plunging liquid jet. For a laminar liquid jet (i.e. one having a turbulence intensity less than about %) the diameters of the induced bubbles were in the range #m.
This contribution presents different approaches for the modeling of gas entrainment under water by a plunging jet. Since the generation of bubbles happens on a scale which is smaller than the bubbles, this process cannot be resolved in meso-scale simulations, which include the full length of the jet and its environment.
This is why the gas entrainment has to be modeled in meso. Gas bubble entrainment by plunging laminar liquid jets Gas bubble entrainment by plunging laminar liquid jets Lin, Tong Joe; Donnelly, Harold G.
W a y n e State U n i v e m t y, Detroit, M i c h i g a n A free, vertical j e t o f liquid plunging into a quiescent surface of the same liquid entrains the surrounding gas into the receiving liquid to form bubbles.
Eventually, the film breaks into bubbles. This study addresses a possible mechanism causing this process. The linear stability of a vertical film of a viscous gas bounded by liquid in uniform motion on one side, and by liquid at rest on the other side, is studied.
On the basis of experimental studies dependences (4) and (6) were obtained, which make it possible to determine the air-entrainment velocity by laminar and turbulent jets.
Dependences (4) and (6) are confirmed by investigations of other authors. The conditions of the onset of air entrainment by laminar jets were investigated in the entire range of variation of Re numbers for the laminar.
Abstract. 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.
rair*Vn 2*D n /s to and it is understandable that the vertical jets would have a visually smooth appearance, al-though the free-jet was turbulent. Bin, ‘‘Gas entrainment by plunging liquid jets,’’ Chem.
Eng. Sci. 48, ~!. Chanson, Air Bubble Entrainment in Free-Surface Turbulent Shear Flows ~Academic, London, U.K., !. The entrainment, breakup, and interplay of air bubbles were observed in a vertical, two-dimensional supported jet at low impact velocities.
Ultra-high-speed movies were analyzed b. The hydrodynamics and heat transfer are studied in a layer of subcooled water into which vertical liquid jets plunge from a steam medium above the liquid and entrain steam from the steam space.
The studies are performed as applied to the operating conditions of direct-contact jet condensers and deaerators. An equation is obtained for calculating the heat transfer in the.
AIR ENTRAINMENT BY A WATER JET Experimental Program The water jet velocity, V j, at the nozzle exit was varied from to 15 m/s. The water jet length, L j, from the nozzle outlet to the plunging point of a water jet on the water surface of the tank, was m.
Plunging jet entrainment is a highly efficient mechanism for producing large gas-liquid interfacial areas. Applications include minerals-processing flotation cells, waste-water treatment, oxygenation of mammalian-cell bioreactors, riverine re-oxygenation weirs and the understanding of plunging ocean breakers.
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 .Plunging jets can be operated either as unconfined or confined devices. In an unconfined system, the liquid jet plunges into an open liquid pool, creating a conical downflow dispersion of fine bubbles that is surrounded by an upflow of larger coalesced bubbles, as shown in Figure 1a .In this case, the bubbles have a small penetration depth because of the spreading of the submerged jet.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.