An Experimental Analysis of the Spraying Processes in Improved Design of Effervescent Atomizer

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F18%3APU126286" target="_blank" >RIV/00216305:26210/18:PU126286 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S030193221730246X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S030193221730246X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijmultiphaseflow.2018.01.012" target="_blank" >10.1016/j.ijmultiphaseflow.2018.01.012</a>

Result language

angličtina

Original language name

An Experimental Analysis of the Spraying Processes in Improved Design of Effervescent Atomizer

Original language description

This work experimentally examines the primary atomization processes in a newly developed atomizer, similar to effervescent atomizer concept, at low pressures and low gas-to-liquid ratios (GLR). Several experimental and post-processing techniques are applied to investigate the spray spatial evolution. The near-nozzle area is captured by a high-speed camera with a long-distance microscope. Further, characteristics of the developed spray are investigated by a phase-Doppler analyser (PDA). The high-speed recordings are processed by the proper orthogonal decomposition (POD). The frequency analysis of examined phenomenon is done by the fast Fourier transformation (FFT) at selected positions in the images. The POD enables to sort out data according to the importance of characteristic shapes occurring in the recordings. The velocity and dimensions of discharging liquid are measured in images by a point-tracking method. Dimensionless criteria are estimated to describe the atomization principles where several new findings are found comparing the previous studies. The spatial spray evolution is described by the processed PDA data. A simplification, based on the Stokes number, is used to estimate a gas motion in the spray. This approach enables to investigate the interaction between the spray and ambient atmosphere. The combination of experimental and post-processing techniques confirms the previous findings of the improved effervescent atomizer. In other words, the atomizer operates inherently in annular two-phase flow regime which, however, leads to a specific atomizing mechanism, i.e. bubble bursts, the same as in the effervescent spraying process. However, an importance of the interaction between the two following bubble bursts is highlighted as driving atomization mechanism. This specific behaviour is the reason why the atomizer can be operated at low consumption of gas and low-pressure regimes. Moreover, the applied experimental and post-processing techniques indicate a p

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW

ISSN

0301-9322

e-ISSN

1879-3533

Volume of the periodical

103

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

1-15

UT code for WoS article

000436212800001

EID of the result in the Scopus database

2-s2.0-85042673231