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Computational modeling and simulation of gas focused liquid micro-sheets
ID
Belšak, Grega
(
Author
),
ID
Bajt, Saša
(
Author
),
ID
Šarler, Božidar
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S0301932221001142
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Abstract
The purpose of this work is to numerically evaluate the behavior of microscopic gas-focused liquid sheets in terms of material properties, nozzle structure and operating conditions used for experiments in spectroscopy and scattering where a short optical path is required. The numerical simulations are presented of a gas flow focusing nozzle, capable of producing a stream consisting of a sequence of perpendicular micrometre thin liquid sheets. The nozzle structure consists of a central circular capillary for delivery of the liquid and two circular capillaries that provide the focusing gas flow in a converging direction from opposite directions. High velocity impinging gas jets accelerate and form a thin elliptically shaped liquid sheet which contracts downstream and eventually forms a similar shaped sheet in the plane perpendicular to the primary sheet. The process repeats further downstream with another contraction, forming the tertiary sheet, existing now in the same plane as the primary sheet. This produces a liquid jet in form of a series of perpendicular micrometre thin liquid sheets. Three dimensional conservation equations of mass, energy and momentum for a compressible two-phase system are solved with a finite volume approach and an algebraic volume of fluid method. The influence of liquid viscosity, density, surface tension, nozzle layout variation as well as gas and liquid operating parameters on the evolution of the primary liquid sheet is elaborated. The parameter space of six flow characterizing dimensionless numbers is explored in the following ranges: Reynolds gas number 64–130, Reynolds liquid number 122–620, Weber number 23–803, ratio of liquid to gas mass flow rate 16–58, viscosity ratio 26–79, and density ratio 4807–7221. The layout of the primary sheet is given in terms of sheet thickness, width and length. The results show minor effect of dynamic viscosity, a moderate effect of density and a dominant role of the surface tension. The liquid sheet shape is sensitive to the variation of gas and liquid flow rates as well as the nozzle’s structure width and the angle between the liquid delivery and the focusing gas capillaries.
Language:
English
Keywords:
liquid micro-sheets
,
two-phase nozzle flow
,
computational model
,
sensitivity study
,
liquid properties
,
operating conditions
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2021
Number of pages:
13 str.
Numbering:
Vol. 140, art. 103666
PID:
20.500.12556/RUL-138687
UDC:
519.876.5:532.529
ISSN on article:
0301-9322
DOI:
10.1016/j.ijmultiphaseflow.2021.103666
COBISS.SI-ID:
59703811
Publication date in RUL:
09.08.2022
Views:
1319
Downloads:
84
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Record is a part of a journal
Title:
International journal of multiphase flow
Shortened title:
Int. j. multiph. flow
Publisher:
Elsevier
ISSN:
0301-9322
COBISS.SI-ID:
25649408
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
tekoče mikroskopske ploskve
,
dvofazni tok skozi šobo
,
računski model
,
študija občutljivosti
,
lastnosti tekočine
,
obratovalni pogoji
Projects
Funder:
Other - Other funder or multiple funders
Funding programme:
Centre of Free Electron Laser
Name:
Innovative methods for imaging with the use of X-ray free electron laser (XFEL) and synchrotron sources: simulation of gas-focused microjets
Funder:
Other - Other funder or multiple funders
Funding programme:
Helmholtz Association
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0162
Name:
Tranzientni dvofazni tokovi
Funder:
ARRS - Slovenian Research Agency
Project number:
J2-1718
Name:
Napredno brezmrežno modeliranje in simulacija večfaznih sistemov
Funder:
Other - Other funder or multiple funders
Funding programme:
Deutsche Forschungsgemeinschaft, Cluster of Excellence
Project number:
EXC 2056 390715994
Name:
CUI: Advanced Imaging of Matter
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