Alan Friis - Articles and news items

Fluid flow in cleaning of closed processes

Issue 1 2006, Past issues  •  9 March 2006  •  Assistant Professor Bo Boye Busk Jensen and Associate Professor Alan Friis, Food Biotechnology and Engineering, BioCentrum-DTU

The efficiency of Cleaning-In-Place (CIP) procedures greatly depends on fluid flow (i.e. the motion of detergent and rinsing water). Thorough understanding of the physical action of fluid flow during cleaning allows for redesign of equipment and design of CIP procedures with respect to optimal cleaning characteristics. This article discusses the importance of fluid flow as an aspect of the cleaning processes. Computational Fluid Dynamics (CFD) is applied for prediction of areas inside closed process equipment, which are potentially difficult to clean. Finally, some commonly encountered questions on flow conditions during cleaning are discussed based on CFD results.

Wanted: hygienic systems integration

Issue 2 2005, Past issues  •  3 May 2005  •  Dr. Lotte Dock Steenstrup, Dr. Alan Friis, BioCentrum-DTU, The Technical University of Denmark and Dr. Roland Cocker, Cocker Consulting, Netherlands

The demands that are placed on product and process within the food production industry are interconnected. Therefore, it is not appropriate to use a largely sequential approach to designing a production facility, where you first address the primary function of the product, i.e. product quality and then consider other issues such as safety, hygienic design, cleaning, flexibility and traceability. There is a need for integration of these issues, in order to make the best decisions and to balance the different needs.