Analysis of a new type of high pressure homogeniser. A study of the flow pattern |
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Authors: | Juliane Floury,Jerô me Bellettre,Anne Desrumaux |
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Affiliation: | a GEPEA, UMR, CNRS 6144, Enitiaa Rue de La Géraudière—BP82225 Nantes CX 3 44322, France b DSEE, Ecole des Mines de Nantes, La Chantrerie, 4 rue A. Kastler, BP 20722, Nantes CX 3 44307, France c GEPEA, UMR, CNRS 6144, Université de Nantes - IUT de Saint-Nazaire C.R.T.T. B.P. 406 Saint-Nazaire CX 44602, France |
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Abstract: | High-pressure homogenisation is a key unit operation used to disrupt fat globules or cells containing intracellular bioproducts (AIChE J. 43(4) (1997) 1100). Modelling and optimisation of a small homogenising unit are often restrained by a lack of information on the flow conditions within the homogeniser valve. A numerical investigation of the flow within such a new homogenising valve, capable to reach pressure as high as (Stansted Fluid Power Ltd, UK) is presented. Results are obtained using the finite-volume technique and a RNG k-ε turbulence model with low Reynolds number near wall treatment conditions. An experimental measurement of the size of the valve gap is presented in order to validate mathematical relations that give valve gap sizes versus homogenising pressure. The modelling results give detailed information on the mechanical stresses and the high shear rates in small disruption valves, and also reveal other phenomena that could not be easily determined experimentally. |
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Keywords: | Homogenisation Hydrodynamics Numerical analysis Shear Turbulence Cavitation |
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