About the Multidisciplinary Seminar Program

Created in 1995, the Escola Tecnica Superior d'Enginyeria Quimica (ETSEQ) at Universitat Rovira i Virgili aims at becoming an international reference in chemical engineering education and research. The ETSEQ is located in an area that is socially and economically very dynamic, and that is home to one of the most important centers of chemical industry in southern Europe.

The Multidisciplinary Seminar Program is both the seminar series for faculty and researchers in the ETSEQ, and a mandatory class for its graduate students. The Program aims at inviting leading international researchers working on areas that are of interest to faculty and researchers in the School.

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Next seminar (May 9, 2014)

Influence of wall flow on the quality of cleaning in place of food production lines (Patrick Legentilhomme)

Location: TBD
Start time: 12 p.m.


The present work deals with both effects of the geometry and the flow field on the removal of B. cereus spores from inert surfaces during a cleaning in place (CIP) procedure. Due to their strong ability to adhere to the equipment surfaces and their high resistance to cleaning process, these spores present a major sanitary hazard in the food industry. The objectives of this work were to study the effect of the geometry arrangements on the distribution of the local wall shear stress and to understand consequences of flow pattern on the bacterial soiling before and after a cleaning procedure. Flow characterisation of different loops containing several pieces of equipment used in dairy processing lines was carried out by means of instantaneous velocity profiles (Ultrasonic Doppler Velocimetry method) and wall shear stress components (electrochemical method). Initial and residual soiling levels, before and after cleaning, were determined for each geometry and explained by the effect of various interacting geometrical elements on the flow. Cleanability analysis at welding zones and gaskets has shown that the adhesion and the removal of spores in these zones are independent of the shear stress, they are rather related to the surface properties. Interaction between eddies of different sizes and suspended or adhered spores were studied. The removal and the deposition phenomena of spores were related to the size of the eddies and their activity near the wall.
Key words : Cleaning in place, Electrochemical method, Ultrasonic Doppler Velocimetry, Bacillus cereus spores, Wall shear stress.

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