Analysis of the Effect of the Atomizer Swirl Chamber on the Liquid Atomization Process

2020 ◽  
pp. 153-160
Author(s):  
Franciszek Klimczak ◽  
Tomasz Burda ◽  
Marek Ochowiak ◽  
Sylwia Włodarczak ◽  
Andżelika Krupińska
Keyword(s):  
Atomization Process ◽  
Swirl Chamber ◽  
Liquid Atomization

scholarly journals Improved Atomization via a Mechanical Atomizer with Optimal Geometric Parameters and an Air-Assisted Component

Micromachines ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 584
Author(s):  
Inna Levitsky ◽  
Dorith Tavor
Keyword(s):  
Liquid Fuel ◽  
High Efficiency ◽  
Geometric Parameters ◽  
Supply Pressure ◽  
Swirl Chamber ◽  
Air Supply ◽  
Wide Range ◽  
Liquid Atomization ◽  
Atomization Characteristics ◽  
Geometrical Dimensions

Atomization of liquid media is a key aim in various technological disciplines, and solutions that improve spray performance, while decreasing energy consumption, are in great demand. That concept is very important in the development of liquid fuel spray atomizers in high-efficiency microturbines and other generator systems with low inlet pressure and a wide range of power supply. Here we present a study of the liquid atomization characteristics for a new mechanical atomizer that has optimal geometric parameters and a preliminary swirl stage. In our air-assisted atomizer, air is introduced through a swirl chamber positioned at the exit of the mechanical atomizer. The optimized mechanical atomizer alone can achieve D32 drop diameters in the range of 80 to 40 µm at water supply pressures of 2 to 5 bar, respectively. The addition of an air swirl chamber substantially decreases drop sizes. At an air–liquid ratio (ALR) equal to 1, water pressures of 2.5 to 3 bar and air supply pressures 0.35 to 1 bar, D32 drops with diameters of 20–30 µm were obtained. In an air-assisted atomizer the parameters of the mechanical atomizer have a much stronger influence on drop diameters than do characteristics of the air-swirl chamber. Using a mechanical atomizer with optimal geometrical dimensions allows limiting the liquid supply pressure to 5 bar; but when an air-assisted component is introduced we can recommend an ALR ≈ 1 and an air supply pressure of up to 1 bar.

scholarly journals Mathematical modelling of the liquid atomization process by cocurrent gas flow

2016 ◽  
Vol 124 ◽  
pp. 012076 ◽  
Author(s):  
V A Arkhipov ◽  
V M Boiko ◽  
V D Goldin ◽  
E A Maslov ◽  
S E Orlov ◽  
...  
Keyword(s):  
Mathematical Modelling ◽  
Gas Flow ◽  
Atomization Process ◽  
Liquid Atomization

Liquid Atomization in a High-Speed Slinger Atomizer

2019 ◽  
Author(s):  
Arnab Chakraborty ◽  
Srikrishna Sahu
Keyword(s):  
Liquid Flow ◽  
Rotational Speed ◽  
High Speed ◽  
Working Fluid ◽  
Light Illumination ◽  
Atmospheric Conditions ◽  
Atomization Process ◽  
High Rotational Speed ◽  
Jet Breakup ◽  
Liquid Atomization

Abstract The present research aims to investigate the liquid atomization process in a slinger atomizer test rig that houses a high-speed motor which allows high rotational speed of the slinger disc. Instead of delivering the liquid directly on the slinger disc, which is commonly reported in the literature, a stationary manifold was designed that receives the liquid from the pump and supply multiple liquid jets that impinge on the rotating slinger disc. The liquid jet breakup process was visualized using front light illumination technique. All experiments were performed using water as the working fluid and under atmospheric conditions. Four different water flow rates, ranging from 0.2 lpm up to 0.8 lpm were considered. The rotational speed of the slinger was varied from 5000 rpm up to 30000 rpm, which has been rarely reported in the past. The paper reports a comprehensive study on the differences in the liquid breakup modes due to higher liquid flow rate for the same rotational speed and vice-versa. Mostly the liquid was found to attach to the side of the slinger holes that is opposite to the direction of rotation indicating the strong influence of Coriolis forces on the liquid flow within the slinger and hence the atomization process. The droplet size in the spray was measured using the Interferometric Laser Imaging for Droplet Sizing (ILIDS) technique.

scholarly journals Liquid Atomization and Spray: A Multi-Scale Description

2017 ◽  
Author(s):  
Christophe Dumouchel
Keyword(s):  
Euclidean Distance ◽  
Liquid System ◽  
Scale Analysis ◽  
Atomization Process ◽  
Interface Evolution ◽  
Multi Scale ◽  
Liquid Atomization ◽  
Distance Mapping ◽  
3D Applications ◽  
Multi Scale Analysis

A multi-scale approach to investigate liquid atomization processes is introduced. It describes the liquid system by the scale distribution whose determination is inspired from the Euclidean Distance Mapping used to measure the fractal dimension of a contour. The scale distribution is introduced in 2D and in 3D and applications from previous investigations are presented. The 2D applications are performed on experimental images and the 3D applications are performed on results obtained from Direct Numerical Simulation. The multi-scale analysis allows identifying and quantifying the mechanisms responsible for the interface evolution according to the scale. Among other results, the analyses presented here demonstrate the improvement of the atomization process when an elongation mechanism contributes to the thinning of the small structures. The multi-scale tool also provides new metrics that may be used to validate simulation results. An example of this is presented and discussed. Finally, the paper evokes several approaches to implementing the scale-distribution concept to improve or build new models.

Computational Prediction of the Effect of Microcavitation on an Atomization Mechanism in a Gasoline Injector Nozzle

2010 ◽  
Vol 132 (8) ◽  
Author(s):  
Jun Ishimoto ◽  
Fuminori Sato ◽  
Gaku Sato
Keyword(s):  
High Speed ◽  
Liquid Core ◽  
Liquid Interface ◽  
Nozzle Flow ◽  
Force Model ◽  
Shear Stresses ◽  
Atomization Process ◽  
Injector Nozzle ◽  
Liquid Atomization ◽  
Primary Breakup

The effect of microcavitation on the 3D structure of the liquid atomization process in a gasoline injector nozzle was numerically investigated and visualized by a new integrated computational fluid dynamics (CFD) technique for application in the automobile industry. The present CFD analysis focused on the primary breakup phenomenon of liquid atomization which is closely related to microcavitation, the consecutive formation of liquid film, and the generation of droplets by a lateral flow in the outlet section of the nozzle. Governing equations for a high-speed lateral atomizing injector nozzle flow taking into account the microcavitation generation based on the barotropic large eddy simulation-volume of fluid model in conjunction with the continuum surface force model were developed, and then an integrated parallel computation was performed to clarify the detailed atomization process coincident with the microcavitation of a high-speed nozzle flow. Furthermore, data on such factors as the volume fraction of microcavities, atomization length, liquid core shapes, droplet-size distribution, spray angle, and droplet velocity profiles, which are difficult to confirm by experiment, were acquired. According to the present analysis, the atomization rate and the droplets-gas atomizing flow characteristics were found to be controlled by the generation of microcavitation coincident with the primary breakup caused by the turbulence perturbation upstream of the injector nozzle, hydrodynamic instabilities at the gas-liquid interface, and shear stresses between the liquid core and periphery of the jet. Furthermore, it was found that the energy of vorticity close to the gas-liquid interface was converted to energy for microcavity generation or droplet atomization.

Sign in / Sign up

Export Citation Format

Share Document