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High resolution experimental measurement of turbulent flow field in a highpressure homogenizer model and its implications on turbulentdrop fragmentation
Lund University, Department of Food Technology, Engineering and Nutrition.ORCID iD: 0000-0002-0002-661X
Lund University, Department of Energy Sciences.
Tetra Pak Processing Systems, Lund.
Lund University, Department of Energy Sciences.
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2011 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 66, no 8, 1790-1801 p.Article in journal (Refereed) Published
Abstract [en]

Particle image velocimetry is performed on a model of a high pressure homogenizer, scaled for qualitative similarity of the one phase turbulent flow field in a production scale homogenizer. Flow fields in gap entrance, gap and gap outlet chamber are obtained with high resolution. The measurements show gap flow development and formation of a turbulent wall adherent jet when exiting into the outlet chamber. Turbulent kinetic energy spectra show how the turbulent energy available for fragmentation is transported over distance along the jet centre axis.

The high resolution images are also used together with a Kolmogorov-Hinze theory framework for discussing drop fragmentation together with a direct evaluation of disruptive stresses from measurements. For the turbulent inertial mechanism large drops experience high fragmenting force close to eight gap heights downstream of the gap exit where as this occurs closer to 20 gap heights for smaller drops. The turbulent viscous mechanism is most efficient at a downstream distance of eight gap heights into the outlet chamber for all drops sizes.

Place, publisher, year, edition, pages
2011. Vol. 66, no 8, 1790-1801 p.
Keyword [en]
Homogenization, Turbulence, Hydrodynamics, Emulsion, Particle image velocimetry, Fragmentation
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hkr:diva-12392DOI: 10.1016/j.ces.2011.01.026ISI: 000288015800024OAI: oai:DiVA.org:hkr-12392DiVA: diva2:733602
Available from: 2014-07-10 Created: 2014-07-10 Last updated: 2016-04-01Bibliographically approved

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Citation style
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