Abstract
AbstractIn a tube injection system for High Pressure Processing (HPP) of foods and biomaterials, pressure transmitting medium is injected into the vessel to increase the pressure up to 1000 MPa generating a submerged liquid jet. The presence of a turbulent free jet during pressurizing and its positive influence on the homogeneity of the product treatment have already been examined by computational fluid dynamics investigations. However, up to now there is no experimental evidence, supporting the existence and properties of turbulence of a free jet during HPP due to difficulties in gaining in–situ insight into the high pressure vessel and the lack of high pressure withstanding probes. Hence, we developed two experimental setups: (1) HP–Laser Doppler Anemometry (HP–LDA), and (2) HP–Hot Wire Anemometry (HP–HWA). This paper presents first results of velocity profiles measured by LDA and HWA under high pressure conditions up to 300 MPa. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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