Discussion: “Jet Break-Up and Mixing Throat Lengths for the Liquid Jet Gas Pump” (Cunningham, R. G., and Dopkin, R. J., 1974, ASME J. Fluids Eng., 96, pp. 216–226)

1975 ◽  
Vol 97 (1) ◽  
pp. 134-134
Author(s):  
S. T. Bonnington
Keyword(s):  
Liquid Jet ◽  
Break Up

scholarly journals Wave packet analysis and break-up length calculations for an accelerating planar liquid jet

2012 ◽  
Vol 44 (1) ◽  
pp. 015503 ◽  
Author(s):  
M R Turner ◽  
J J Healey ◽  
S S Sazhin ◽  
R Piazzesi
Keyword(s):  
Wave Packet ◽  
Liquid Jet ◽  
Break Up

Bending and break-up of a liquid jet in a high pressure airflow

2003 ◽  
Vol 27 (4) ◽  
pp. 449-454 ◽  
Author(s):  
A. Cavaliere ◽  
R. Ragucci ◽  
C. Noviello
Keyword(s):  
High Pressure ◽  
Liquid Jet ◽  
Break Up

Note on the break-up of a charged liquid jet

1962 ◽  
Vol 13 (1) ◽  
pp. 151-157 ◽  
Author(s):  
R. H. Magarvey ◽  
L. E. Outhouse
Keyword(s):  
Size Distribution ◽  
Drop Size ◽  
Drop Size Distribution ◽  
Point Of View ◽  
Liquid Jet ◽  
Disintegration Process ◽  
Photographic Evidence ◽  
Break Up

The disintegration of a charged liquid jet is examined, and the break-up mechanism inferred from photographic evidence. Gravitational, molecular and electrical forces all contribute to the segmentation of the jet and determine the drop size distribution. The disintegration process is investigated from the point of view of drop generation. The segmentation of the charged jet differs from the known ways in which an uncharged jet is broken into drops.

Primary Break-up of a Viscous Liquid Jet in a Cross Airflow

2003 ◽  
Vol 20 (4) ◽  
pp. 283-289 ◽  
Author(s):  
Madjid Birouk ◽  
Barry J. Azzopardi ◽  
Thomas Stäbler
Keyword(s):  
Viscous Liquid ◽  
Liquid Jet ◽  
Break Up ◽  
Primary Break

Thorough small-angle X-ray scattering analysis of the instability of liquid micro-jets in air

2013 ◽  
Vol 21 (1) ◽  
pp. 193-202 ◽  
Author(s):  
Benedetta Marmiroli ◽  
Fernando Cacho-Nerin ◽  
Barbara Sartori ◽  
Javier Pérez ◽  
Heinz Amenitsch
Keyword(s):  
Small Angle ◽  
Free Electron ◽  
Liquid Jets ◽  
Liquid Jet ◽  
X Rays ◽  
Free Electron Lasers ◽  
X Ray ◽  
X Ray Scattering ◽  
Break Up ◽  
Ray Scattering

Liquid jets are of interest, both for their industrial relevance and for scientific applications (more important, in particular for X-rays, after the advent of free-electron lasers that require liquid jets as sample carrier). Instability mechanisms have been described theoretically and by numerical simulation, but confirmed by few experimental techniques. In fact, these are mainly based on cameras, which is limited by the imaging resolution, and on light scattering, which is hindered by absorption, reflection, Mie scattering and multiple scattering due to complex air/liquid interfaces during jet break-up. In this communication it is demonstrated that synchrotron small-angle X-ray scattering (SAXS) can give quantitative information on liquid jet dynamics at the nanoscale, by detecting time-dependent morphology and break-up length. Jets ejected from circular tubes of different diameters (100–450 µm) and speeds (0.7–21 m s−1) have been explored to cover the Rayleigh and first wind-induced regimes. Various solvents (water, ethanol, 2-propanol) and their mixtures have been examined. The determination of the liquid jet behaviour becomes essential, as it provides background data in subsequent studies of chemical and biological reactions using SAXS or X-ray diffraction based on synchrotron radiation and free-electron lasers.

Pratt and Whitney Gas Turbine Combustor Design Using ANSYS Fluent and User Defined Functions

2012 ◽  
Author(s):  
Baris A. Sen ◽  
Yanhu Guo ◽  
Randal G. McKinney ◽  
Federico Montanari ◽  
Frederick C. Bedford
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cross Flow ◽  
Product Family ◽  
Liquid Jet ◽  
Resource Requirement ◽  
Ansys Fluent ◽  
Systematic Testing ◽  
Jet In Cross Flow ◽  
Break Up

This paper summarizes work conducted at Pratt & Whitney to incorporate ANSYS Fluent into the computational fluid dynamics-based combustor design process. As a first step, turbulence, combustion and spray models that already exist and have been validated in the Pratt & Whitney legacy computational fluid dynamics (CFD) solver ALLSTAR were converted into user defined functions (UDFs) for usage with the core ANSYS Fluent solver. In this manner, a baseline solver was established that allowed a systematic testing of the ANSYS Fluent native models. The baseline solver was validated against computational results as well as experimental data obtained for (i) liquid jet in cross-flow (LJICF), (ii) ambient spray injector tests and (iii) Pratt & Whitney next generation product family configurations. These test cases established a thorough evaluation of ANSYS Fluent with UDFs on a spectrum of simple to complex geometries and flow physics relevant to the conditions encountered in aeroengine combustors. Results show that Fluent produces calculated results obtained by ALLSTAR with similar level of agreement to the experiments. Furthermore, Fluent provides better convergence compared to the legacy ALLSTAR solver with a similar computational resource requirement. The ANSYS Fluent native spray break-up models were also tested for the liquid jet in cross flow configuration, demonstrating the importance of modeling the stripping and primary break-up regime of a spray jet. This capability is currently available only via the use of UDFs.

Numerical Simulations of Liquid Jet Break Up in a Crossflow

2013 ◽  
Author(s):  
Mohit Jain ◽  
Gaurav Tomar ◽  
R. V. Ravikrishna ◽  
Surya Prakash R. ◽  
B. N. Raghunandan
Keyword(s):  
Temporal Evolution ◽  
Computational Cost ◽  
Cross Flow ◽  
Liquid Jet ◽  
Test Case ◽  
Lagrangian Particles ◽  
Circular Orifice ◽  
Coupling Approach ◽  
Break Up ◽  
Two Phases

Atomization is the process of disintegration of a liquid jet into ligaments and subsequently into smaller droplets. A liquid jet injected from a circular orifice into cross flow of air undergoes atomization primarily due to the interaction of the two phases rather than an intrinsic break up. Direct numerical simulation of this process resolving the finest droplets is computationally very expensive and impractical. In the present study, we resort to multiscale modelling to reduce the computational cost. The primary break up of the liquid jet is simulated using Gerris, an open source code, which employs Volume-of-Fluid (VOF) algorithm. The smallest droplets formed during primary atomization are modeled as Lagrangian particles. This one-way coupling approach is validated with the help of the simple test case of tracking a particle in a Taylor-Green vortex. The temporal evolution of the liquid jet forming the spray is captured and the flattening of the cylindrical liquid column prior to breakup is observed. The size distribution of the resultant droplets is presented at different distances downstream from the location of injection and their spatial evolution is analyzed.

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