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Pulsed flow for enhanced cleaning in food processing

Paper ID Volume ID Publish Year Pages File Format Full-Text
19151 43046 2010 8 PDF Available
Title
Pulsed flow for enhanced cleaning in food processing
Abstract

The use of slow (∼1 Hz) flow oscillation imposed on a stationary flow of liquid has been shown to enhance shear stresses imposed on a surface and to mitigate fouling or enhance cleaning. Examples of the application of pulsed flow are presented in this paper. A new measuring technique in combination with tailored CFD simulations was developed for monitoring the cleaning of complex piping equipment with pulsed flow. A time-independent and isotropic approach to model the wall shear stress is introduced. The optical monitoring procedure uses a model food soil consisting of starch as matrix material and phosphorescent zinc sulfide crystals as optical tracer. Investigations of pulsed flow cleaning published prior to this work focused on tests with straight pipes, whereas difficulties in industrial cleaning operations more often arise while operating piping systems and plant components with complex geometries. Therefore cleaning experiments were performed in a CIP test rig simulating industrial cleaning processes. The results with pulsed flow show an enhancement of cleaning efficiency at locations difficult to access using stationary flow.

Research highlights▶ Development of a new optical method for the detection of residual food soils. ▶ Prediction of the maximum local wall shear stress in complex geometries by CFD. ▶ Enhancement of the cleaning efficiency at locations difficult to access.

Keywords
Fouling; Cleaning; Pulsed flow; Shear stress; Removal; Monitoring
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 88, Issue 4, December 2010, Pages 384–391
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us