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Research Papers: Fundamental Issues and Canonical Flows

Theoretical Investigation of the Influence of Liquid Physical Properties on Effervescent Atomization Performance

[+] Author and Article Information
Lijuan Qian

 China Jiliang University, Hangzhou, 310018, People’s Republic of China

Jianzhong Lin1

 China Jiliang University, Hangzhou, 310018, People’s Republic of China; and  State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, People’s Republic of China e-mail:mecjzlin@public.zju.edu.cn

Hongbing Xiong

 State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, People’s Republic of China

Tat Leung Chan

 Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

1

Corresponding author.

J. Fluids Eng 133(10), 101205 (Oct 04, 2011) (11 pages) doi:10.1115/1.4004256 History: Received October 07, 2009; Accepted May 14, 2011; Published October 04, 2011; Online October 04, 2011

Background. A comprehensive model in the Eulerian-Lagrangian scheme is used to investigate the performance of the gas-droplet two-phase flow for a typical effervescent atomization spray with different atomized liquids. Method of Approach. Based on the particle tracking method, the droplet primary and secondary breakup, droplets collision and coalescence are taken into consideration. Results. The predicted droplet mean size is compared well with the published experimental data. The influences of liquid physical properties are discussed not only on droplet mean size, but also on droplet velocity, distribution, events of breakup and collision, Weber number, Ohnesorge number and their evolutions. Conclusions. Results show liquid viscosity has a slight effect on the droplet size and its distribution. While a decrease in liquid surface tension serves to get finer droplets and wider droplet spatial distribution. Small liquid density, surface tension and viscosity are benefit for getting higher atomized droplet velocity.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the effervescent atomization sprays and the computational mesh

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Figure 2

Compare of predicted SMD from the primary breakup model with experimental data for various liquid physical properties: (a) viscosity, (b) surface tension

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Figure 3

Compare of predicted evolution of SMD along axial with experimental data

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Figure 4

Evolution of droplet SMD for different liquids: (a) viscosity (b) surface tension

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Figure 5

Occurrence number of droplet collision and secondary breakup

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Figure 6

Statistical distribution of drop diameters for different liquids at axial distance of 100 mm

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Figure 7

Spatial distribution of water droplet at the middle plane (a) number distribution, (b) diameter distribution

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Figure 8

Spatial distribution of drop number and size at axial distance of 100mm: (a) Alcohol/Water (1/1 by volume), (b) Water, (c) Glycerin/Water (24/76 by mass)

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Figure 9

Liquid mean velocity after primary breakup

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Figure 10

Droplet mean velocity and gas-liquid velocity

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Figure 11

Evolutions of the critical dimensionless number: (a) Weber number, (b) Ohnesorge number

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