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Experiments concerning the origin of streaky structures inside a plane water jet
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0003-3737-0091
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0002-1146-3241
2000 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 26, no 11, 395-400 p.Article in journal (Refereed) Published
Abstract [en]

It is believed that the characteristics of a headbox jet are of vital importance for the formation in the final paper sheet. To better understand the physics of free, plane liquid jets, experiments have been made with wafer emanating from two different nozzles: a plane channel flow nozzle where viscous effects are of importance; and a slid nozzle, which closely approximates art inviscid jet. Both types of flow have been visualized and the visualization of the jet emanating from a channel showed that a strong streamwise streaky structure was created inside the jet a distance downstream the nozzle. These streaks do not originate from the nozzle but instead from the break-lip of two-dimensional waves on the jet travelling in the streamwise direction. This streaky structure could not be found at any velocity (<15 m/s) in the jet from the slit nozzle.

Place, publisher, year, edition, pages
2000. Vol. 26, no 11, 395-400 p.
Keyword [en]
head boxes, nozzles, machine design, water flow, streaking, fluid dynamics, liquid sheet, instability
Identifiers
URN: urn:nbn:se:kth:diva-20420ISI: 000167307700003OAI: oai:DiVA.org:kth-20420DiVA: diva2:339115
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Söderberg, L. DanielAlfredsson, P. Henrik

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