Instability of Thin Liquid Sheet and Its Break-Up

1976 ◽  
Vol 41 (4) ◽  
pp. 1410-1416 ◽  
Author(s):  
Kazuo Matsuuchi
Keyword(s):  
Liquid Sheet ◽  
Break Up

Break-Up Length and Spreading Angle of Liquid Sheets Formed by Splash Plate Nozzles

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
M. Ahmed ◽  
N. Ashgriz ◽  
H. N. Tran
Keyword(s):  
Experimental Investigation ◽  
Flow Velocity ◽  
Liquid Sheet ◽  
Operating Conditions ◽  
Nozzle Diameter ◽  
Empirical Correlation ◽  
Liquid Viscosity ◽  
Liquid Sheets ◽  
Break Up ◽  
Semi Empirical

An experimental investigation is conducted to determine the effect of liquid viscosity and density, nozzle diameter, and flow velocity on the break-up length and spreading angle of liquid sheets formed by splash plate nozzles. Various mixtures of corn syrup and water were used to obtain viscosities in the range of 1–170 mPa s. Four different splash plate nozzle diameters of 0.5 mm, 0.75 mm, 1 mm, and 2 mm, with a constant plate angle of 55 deg were tested. The liquid sheet angles and the break-up lengths were measured at various operating conditions. An empirical correlation for the sheet spreading angle and a semi-empirical correlation for the sheet break-up lengths are developed.

High-speed visualisation of primary break-up of an annular liquid sheet

2007 ◽  
Vol 44 (3) ◽  
pp. 451-459 ◽  
Author(s):  
Stevano Wahono ◽  
Damon Honnery ◽  
Julio Soria ◽  
Jamil Ghojel
Keyword(s):  
High Speed ◽  
Liquid Sheet ◽  
Break Up ◽  
Primary Break

Theoretical and experimental study of atomization from an annular liquid sheet

2003 ◽  
Vol 217 (8) ◽  
pp. 735-743 ◽  
Author(s):  
Jianming Cao
Keyword(s):  
High Speed ◽  
Liquid Sheet ◽  
Linear Instability ◽  
Flow Conditions ◽  
Flow Parameters ◽  
Break Up ◽  
Atomization Performance ◽  
Linear Instability Analysis ◽  
Two Sides ◽  
Measured Liquid

A temporal linear instability analysis is conducted to examine the e ects of both inner and outer gas velocities and various flow parameters on the break-up process of an annular viscous liquid sheet. The results show that a gas stream of high speed applied to the inner interface is more e ective to promote the sheet instability than to the outer one. Compared with a single gas stream, a co-flowing gas stream with a high speed improves the atomization performance. With the same or di erent gas velocities between the two sides of the liquid sheet, the gas density and the liquid surface tension have di erent e ects on the liquid sheet instability. Experiments measured liquid sheet wavelengths and break-up lengths. Computations with a typical nozzle and the flow conditions are comparable with the experiment.

A Study of the Stability of Plane Fluid Sheets

1955 ◽  
Vol 22 (4) ◽  
pp. 509-514
Author(s):  
W. W. Hagerty ◽  
J. F. Shea
Keyword(s):  
Drop Size ◽  
Size Range ◽  
Wave Length ◽  
Liquid Sheet ◽  
Analytical Treatment ◽  
Plane Sheet ◽  
Density Surface ◽  
Break Up ◽  
The Stability ◽  
The Waves

Abstract In studying the performance of a system for producing sprays of any kind it would be desirable to arrive at an expression which would relate the drop-size distribution and the spatial distribution of the drops in terms of the variables of the system including pressure, density, surface tension, and geometry. In an earlier study of the performance of hollow-cone swirl-type nozzles, photographs were taken of the region where the fluid sheet breaks up into drops. These photographs showed that before the break-up occurred, waves or ripples appeared on the surface of the liquid sheet. It was believed that the waves were responsible for the break-up and that frequency and wave length of the ripples might be related to the size range of drops produced. Difficulties were encountered in an analytical treatment of the stability of the surface produced by a swirl-type nozzle, the surface being a hyperboloid of revolution. Therefore a system was selected for study in which a flat sheet of fluid is produced by a slender orifice, and which may be subjected to waves of any desired frequency. This plane sheet, exposed on both sides, appears to have the essential characteristics of the sheet produced by a conventional nozzle.

Mixture formation and controlled auto-ignition combustion in four-stroke gasoline engines with port and direct fuel injections

2005 ◽  
Vol 6 (4) ◽  
pp. 311-329 ◽  
Author(s):  
L Cao ◽  
H Zhao ◽  
X Jiang ◽  
N Kalian
Keyword(s):  
Fuel Injection ◽  
Liquid Sheet ◽  
Exhaust Valve ◽  
Combustion Model ◽  
Injection Timing ◽  
Valve Closure ◽  
Gasoline Engines ◽  
Cycle Simulation ◽  
Auto Ignition ◽  
Break Up

Controlled auto-ignition (CAI) combustion, also known as homogeneous charge compression ignition (HCCI) can be achieved by trapping residuals with early exhaust valve closure in both port and direct fuel injection four-stroke gasoline engines. A multi-cycle three-dimensional engine simulation program has been developed and applied to study the effect of injection on in-cylinder mixing and CAI combustion. The full engine cycle simulation, including complete gas exchange and combustion processes, was carried out over several cycles in order to obtain the stable cycle for analysis. The combustion models used in the present study are based on the Shell auto-ignition model and the characteristic-time combustion model, both of which have been modified to take the high level of residual gas into consideration. A liquid sheet break-up spray model was used for the droplet break-up processes. The analyses show that the injection timing plays an important role in affecting the in-cylinder air/fuel mixing and mixture temperature, which in turn affects the CAI combustion and engine performance. In comparison with the port fuel injection case, an early direct injection at exhaust valve closure can lead to higher load and lower fuel consumption.

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