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Processes 2016, 4(4), 41; doi:10.3390/pr4040041

Optical Measuring Methods for the Investigation of High-Pressure Homogenisation

Institute of Process Engineering in Life Sciences, Section I: Food Process Engineering, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76131 Karlsruhe, Germany
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Academic Editor: Andreas Håkansson
Received: 22 September 2016 / Revised: 4 November 2016 / Accepted: 8 November 2016 / Published: 15 November 2016
(This article belongs to the Special Issue Emulsification Processes)
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Abstract

High-pressure homogenisation is a commonly used technique to produce emulsions with droplets in the micro to nano scale. Due to the flow field in the homogenizer, stresses are transferred to the interface between droplets and continuous phase. Cohesive forces within droplets interact with external stresses. To exceed the cohesive forces, high process pressures are necessary, which might cause a complex flow pattern and large flow velocities. Additionally, the pressure drop can induce cavitation. Inline measurements are a challenge, but necessary to understand droplet break-up in a high-pressure homogenizer. Recently, different optical methods have been used to investigate the flow conditions as well as the droplet deformation and break-up in high-pressure homogenisation, such as high speed imaging, particle and micro particle image velocimetry. In this review, those optical measuring methods are considered critically in their applications and limitations, achievable results and further developments. View Full-Text
Keywords: high-pressure homogenisation; optical measurement methods; flow field characterisation; droplet break-up; emulsification high-pressure homogenisation; optical measurement methods; flow field characterisation; droplet break-up; emulsification
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bisten, A.; Schuchmann, H.P. Optical Measuring Methods for the Investigation of High-Pressure Homogenisation. Processes 2016, 4, 41.

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