3 edition of Analytical description of the breakup of liquid jets in air found in the catalog.
Analytical description of the breakup of liquid jets in air
1993 by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English
|Statement||Demetrios T. Papageorgiou.|
|Series||ICASE report -- no. 93-45., NASA contractor report -- 191503., NASA contractor report -- NASA CR-191503.|
|Contributions||Langley Research Center.|
|The Physical Object|
A world leader in gases, technologies and services for Industry and Health, Air Liquide is present in 80 countries with approximat employees and . Review: Up in the Air By Scott Foundas in the November-December Issue Contemporary Hollywood has steadfastly avoided the workplace—unless the jobs are particularly glamorous (Broadcast News, The Devil Wears Prada), or the workers unfairly exploited (Silkwood, North Country) or the fodder for gallows humor (the Mike Judge oeuvre). such processes. In Fig. , a liquid jet is ejected from a nozzle of diameter 8 mm with a velocity of m/s. To accelerate its breakup, the jet is injected into a co-ﬂowing air stream, with a velocity of 35 m/s. Initially, the shear between the air and the liquid leads to large axisymmetric waves but as theFile Size: 4MB. The nozzle diameter was mm and its L/D ratio was Air velocities lay between 50 m/s and m/s, the air pressure range extended from bar to 15 bar and the air temperature was around K. Fuel flowrates were chosen so that the fuel-to-air momentum flux ratio q assumed mainly values between 2 and Cited by:
Multi-phase flows are part of our natural environment such as tornadoes, typhoons, air and water pollution and volcanic activities as well as part of industrial technology such as power plants, combustion engines, propulsion systems, or chemical and biological industry. The industrial use of multi-phase systems requires analytical and numerical .
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Get this from a library. Analytical description of the breakup of liquid jets in air. [Demetrios T Papageorgiou; Langley Research Center.].
Breakup of liquid jets is a role in deciding the dynamics of the formation as well as breakup of liquid drops and jets. In the dripping regime, the growth and breakup rate of a drop are.
The main parameters for the breaking modes are g and l the gas and liquid densities, the surface tension of the liquid, u g the velocity of the air flow, the viscosity of the liquid and D 0 the. Breakup of liquid jets is a phenomenon related to this problem.
When oil is spilled in the ocean, generally it spreads at the water surface and, depending on its density and composition it might migrate into the water or form a slick at the surface .Cited by: 3. modern applications of the instability of sheets and jets, it is advantageous to hasten the breakup, but in other applications suppression of the breakup is essential.
Hence knowledge of the physical mechanism of breakup, aside from its intrinsic scientiﬁc value, is very useful when one needs to exploit the phenomenon to the fullest extent. work.
The breakup and axis – switching phenomena have been studied for water jets emanating at low pres-sures from few psi to psi from non – circular ori-fices like rectangle, square and triangle and compared with the results obtained from a circular orifice. The jets were discharged into quiescent air background.
Book Description. The theme of this book is an exposition of what we know about the physicsunderlying the onset of instability in liquid sheets and jets. Wave motionand breakup phenomena subsequent to the onset of instability are alsocarefully explained. Physical concepts are established through rigorousmathematics, accurate numerical analyses Cited by: The present study investigates the breakup length and liquid splatter onset point of circular air-assisted jets using nozzle diameters between mm and mm, which cover the range of useful sizes presented by Trainer et al.
Dimensional analysis is performed to identify the non-dimensional parameters which control the jet breakup by: 4. of the compound liquid jets.
The in uence of gravity on the instability and breakup of inviscid and viscous compound jets is also considered. Additionally, we estimate the theoretical breakup lengths, breakup time and droplet sizes of such jets for varying key parameters.
This book, first published inis an exposition of what we knew about the physics underlying the onset of instability in liquid sheets and jets. Wave motion and breakup phenomena subsequent to the onset of instability are carefully by: ABSTRACT. An experimental investigation of primary breakup of nonturbulent round liquid jets in gas crossflows is described.
Pulsed shadowgraph measurements of jet primary breakup regimes, jet deformation properties, time of onset of primary breakup, and liquid column and liquid surface disturbance wavelengths were obtained for air crossflows at normal temperature and pressure.
Citation: Sallam, K. A.; Dai, Z.; Faeth, G. "Turbulent primary breakup of round and plane liquid jets in still air" AIAA, AIAA Aerospace Sciences Cited by: 1. Papageorgiou D.T. () Breakup of Cylindrical Jets Governed by the Navier-Stokes Equations.
In: Hussaini M.Y., Gatski T.B., Jackson T.L. (eds) Transition, Turbulence and Combustion. ICASE/LaRC Interdisciplinary Series in Science and Engineering, vol 2&: Demetrios T. Papageorgiou. 12th ICLASS empirical correlations for breakup length of liquid jet in uniform cross flow 2 mines penetration height at a location downstream of the injector.
The empirical correlations to predict the brea-kup length of liquid jet in cross flow has. Neal K. Nelson and John C. Berg, The effect of chemical reaction on the breakup of liquid jets, Chemical Engineering Science, 37, 7, (), ().
Crossref Scott Anderson and R.B. Page, Purification manufacturing and testing bi-component iodide pellets for metal halide lamps., Journal of Light & Visual Environment, 5, 1, (1), (). The axisymmetric, dynamic breakup of a Newtonian liquid jet injected vertically into another immiscible Newtonian liquid at various Reynolds numbers is investigated here.
The full transient from jet start‐up to breakup into drops was simulated numerically by solving the time‐dependent axisymmetric equations of motion and continuity using an algorithm based on the Volume of Cited by: The purpose of this investigation is to study the effect of the orifice geometry on liquid breakup.
In order to develop a better understanding of the liquid jet breakup, investigations were carried out in two steps—study of low-pressure liquid jet breakup and high-pressure fuel atomization.
This paper presents the experimental investigations conducted to study the flow Cited by: Experimental Investigation of Liquid Jet Breakup at Low Weber Number. Sucharitha Rajendran We have experimentally investigated breakup of round liquid jets the from nozzles with diameters ranging from mm to mm and jet Weber numbers from to 5 The breakup phenomena have been captured using a stagnant ambient air, if the File Size: KB.
In this paper, we study the breakup behavior of Newtonian liquid and non‐Newtonian liquid jets with an arbitrary variation surface tension imposed along its length.
The effect of duty cycle, fluid properties, and the various profiles of the surface tension is investigated. An Investigation into Methods to Control Breakup and Droplet Formation in Single and Compound Liquid Jets by Jamal Uddin A thesis submitted to The University of Birmingham B.1 A list of variables used to describe the breakup of a liquid jet with their dimensions Toward two-phase simulation of the primary breakup of a round liquid jet by a coaxial ow of gas By D.
Kim, O. Desjardins, M. Herrmann AND P. Moin 1. Motivation and objectives Two-phase ows are very common in nature and technical processes such as ocean waves, tire splash, and combustion devices.
Among them, the atomization of liquid jets. ABSTRACT. Breakup of liquid jets issuing from converging (cone-up type) nozzles in a quiescent atmosphere is reviewed in the present paper. This review reveals that, in fact, very little is known about the influence of various factors on the disintegration of the jet.
The experimental breakup of liquid jets subjected to a sinusoidal perturbation is investigated in the Rayleigh and first wind-induced regimes. Stroboscopic illumination of the jet and laser photometry method are used.
The ability of linear spatial and temporal theories to describe certain aspects of the phenomenon is by: Keywords: Liquid jet, instability, break-up length, Weber number. Introduction The instability and disintegration of liquid jets at low Weber numbers is of importance in many atomization applications.
These include drug delivery, coatings and electronic cooling, among others. Breakup of a liquid jet stream from nozzle orifice leads toFile Size: KB.
This paper presents an analysis of the gas-jet wiping process in hot-dip galvanization. This technique consists of reducing the liquid film thickness on a moving substrate by applying gas slot jets.
A theoretical development allows the computation of the film thickness evolution in the wiping by: The liquid jet is produced using the pressure vessel shown in Figure 1. Prior to the experiment the vessel is filled with liquid and compressed gas.
The pressure inside the vessel is monitored with a pressure gauge at the top of the cylinder. To start the flow of liquid, a remotely operated solenoid valve is opened. Air Bubble Entrainment, Breakup, and Interplay in Vertical Plunging Jets 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 ana-lyzed both qualitatively and quantitatively. The onset velocity of bubble entrainment was. Liquid jet generation and breakup 5 where m is the droplet mass, u the uid velocity and D = ˇ 2 r2ˆ gCdjv uj: The coe cient Cd is the drag coe cient, and its value is given in the appendix.
In order to give an explicit form of ˜ and QFile Size: 1MB. omization, a number of breakup models for liquid drops have been proposed and validated . Us-ing these breakup models, there have been several attempts to simulate a liquid jet injected into a chamber by representing the liquid core by a col-lection of liquid drops.
However, the results are easily changed by the initial drop size distribution. Liquid jet breakup in homogeneous and isotropic turbulence without mean flow G.
Charalampous, 1, P. Chounta, Y. Hardalupas1 1Mechanical Engineering Department, Imperial College London, London, SW7 2AZ, UK Abstract The breakup of a laminar water jet and the dispersion of produced droplets under the influence of homogeneous and.
lowed by secondary atomization. The primary atomization is the initial breakup of the liquid jet into large and small liquid structures close to the injection nozzle. It involves complex interface topology of large coherent liquid structures.
The secondary atomiza-tion is the subsequent breakup into smaller drops forming sprays. As distinct. Liquid atomization (i.e., a breakup of liquid jet into dispersed fine droplets) is a complex process involving several physical/chemical phenomena that take place simultaneously.
The spray characteristics (e.g., morphology, droplet size distribution, etc.) are strongly dependent on the atomizer used, especially on its size and by: 1. An experimental study on the breakup of a turbulent round-water jet in still air with a nozzle Reynolds number ofand Weber number of 10, is reported.
The visual structure of the falling water jet was recorded by a high-speed camera, and the characteristics of the falling jet were investigated.
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Breakup of cylindrical jets Singularities and self-similar solutions by Stephane Popinet and Arnaud Antkowiak June 8, (i.e.
the gas-liquid interface of the jet), the free- The previous set of equations is clearly too complex to be amenable to analytical : Stephane Popinet, Arnaud Antkowiak.
Main Analytical solutions for transport processes: fluid mechanics, liquid functions cos stream function fig transport momentum temperature component plate jet transfer layer You can write a book review and share your experiences.
Other readers will always be interested in. The transient evolution of the bubble-size probability density functions resulting from the breakup of an air bubble injected into a fully developed turbulent water ow has been measured experimentally using phase Doppler particle sizing Cited by: A thin stream of liquid can break up into many separate droplets, or it can collapse into one large drop.
Reporting in Physical Review Letters, experimenters used a supersized version of an inkjet printer to explore how the viscosity and length of a liquid “filament” determine its measured a wide range of viscosities, and for each one, found the length at which Author: Don Monroe.
column fracture distance, respectively. It is known that the breakup length of liquid jet in a cross flow is a basically function of the liquid to air momentum flux ratio.
However, Weber number, liquid-to-air viscosity ratio and density ratio, Reynolds number or Ohnesorge number were incorporated in the empirical correlations depending on the. The effects of motive liquid flow rate on air entrainment rate at constant P s are presented in Fig.
It may be seen from the plots that entrainment rate increases with liquid flow rate for a particular nozzle, due to the increase in the average velocity of the air film around the liquid jet (Evans et al., ).
On the breakup of an air bubble. Part 1. Breakup frequency 10–1 X/D J –X 0 /D J e (m 2 s –3) ream evolution of the dissipation rate of TKE. X0 ˇDJ indicates the virtual origin, the velocity at the exit of the nozzle is U0 =17ms−1.
unit mass and per unit time, the Taylor.In general, the breakup length decreases with the increase in the Weber number, gas-to-liquid velocity and density ratios. A predictive model of the initial droplet size and velocity distributions for the subsequently formed spray is also formulated here.Sink flow deforms the interface between a viscous liquid and air into a tip singularity, Phys.
Rev. Lett. 96, () J. Eggers, M.A. Fontelos. Isolated inertialess drops cannot break up, J. Fluid Mech.().