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Dynamics of ultra-high speed liquid jets in still gas
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-5915-0789
2013 (English)In: Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics, ISSN 0253-231X, Vol. 34, no 9, 1654-1658 p.Article in journal (Refereed) Published
Abstract [en]

Instability of free liquid jets is an important fundamental problem rising from multiple engineering fields such as material processing, energy production, etc. Ultra-high speed condition brings new difficulties to stability research. This work demonstrates flow patterns of ultra-high speed liquid jet (UHSLJ) and points out the potential challenges in relevant investigation, from a turbulence point of view. A PDA measurement of flow velocity and droplet size on a cross-section of UHSLJ is present. Flow physics involved in the jet is discussed together with the limitation of this measurement. It is found that the velocity profile on the measured section obeys 1/7 power law. Concentration of droplets has an inverse gradient (from outer region of a jet pointing to the inner region) in the breakup section. Flow properties hold an axisymmetric distribution in the atomization section while this section itself has an evident two-layer (core-outer) structure. The length scales (size of drop) that be resolved by the present experiment is estimated to be only 0.1% of the entire scales.

Place, publisher, year, edition, pages
2013. Vol. 34, no 9, 1654-1658 p.
Keyword [en]
PDA, Stability, Turbulence, Ultra-high pressure liquid jet, Energy productions, Engineering fields, Flow properties, Liquid jets, Material processing, Ultra high speed, Velocity profiles, Convergence of numerical methods, Drop breakup, Liquids, Jets
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-140012ScopusID: 2-s2.0-84886308768OAI: diva2:690104

QC 20140122

Available from: 2014-01-22 Created: 2014-01-16 Last updated: 2014-01-22Bibliographically approved

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Wang, Yuli
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