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Title:Influence of Gas Dynamic Virtual Nozzle Geometry on Micro-Jet Characteristics
Authors:ID Zahoor, Rizwan, Materials Research Laboratory, University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia (Author)
ID Bajt, Saša, Photon Science, Deutsches Elektronen-Synchrotron DESY, Notkestraβe 85, 22607 Hamburg, Germany (Author)
ID Šarler, Božidar, Laboratory for Fluid Dynamics and Thermodynamics, Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, Slovenia - Laboratory for Simulation of Materials and Processes, Institute of Metals and Technology, Lepi pot 1 (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:In this paper we present a numerical study investigating the effects of nozzle geometry on stability, shape and flow characteristics of micron-sized liquid jets, produced by injection molded gas dynamic virtual nozzles (GDVNs) operating in vacuum. The jet characteristics are described as a function of (i) capillary-to-orifice distance, (ii) nozzle outlet orifice diameter, and (iii) liquid feeding capillary angle. An experimentally verified numerical model of GDVN with laminar two-phase Newtonian compressible flow, based on finite volume method and volume of fluid interface tracking, is used to assess the changes. The study is performed for two sets of liquid flow rates while keeping the gas flow rate constant. It is observed that for each value of capillary-to-orifice distance and nozzle outlet diameter there is a minimum liquid flow rate below which the jet is unstable. We find that the nozzle outlet diameter has the biggest influence on the jet diameter, length and velocity, while liquid capillary angle has no observable effect on jet characteristic. Varying capillary-to-orifice distance does not affect the flow field around micro-jet. It is found that the liquid and the gas interaction near the meniscus primarily affect the jet stability and shape
Keywords:Gas dynamic virtual nozzle, Micro-jet, Compressible multiphase flow, Finite volume method, Volume of fluid, Jetting, Dripping
Publication version:Author Accepted Manuscript
Year of publishing:2018
Number of pages:35
Numbering:xxx, xxx
PID:20.500.12556/RUNG-3870-ba8a73a7-ec0c-378a-0bf0-183ea9a0ebd4 New window
COBISS.SI-ID:5124347 New window
DOI: New window
Publication date in RUNG:09.03.2018
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Record is a part of a journal

Title:International Journal of Multiphase Flow
Year of publishing:2018


License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
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.
Licensing start date:09.03.2018