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A comparison of local phosphorescence detection and fluid dynamic gauging methods for studying the removal of cohesive fouling layers: Effect of layer roughness

Paper ID Volume ID Publish Year Pages File Format Full-Text
19179 43048 2014 8 PDF Available
Title
A comparison of local phosphorescence detection and fluid dynamic gauging methods for studying the removal of cohesive fouling layers: Effect of layer roughness
Abstract

•Local phosphorescence detection and scanning fluid dynamic gauging are compared.•Cleaning of artificially roughened starch layers from ss substrates is studied.•Rough layers are removed faster, with good correlation between LPD and FDG results.•sFDG data provide mechanistic understanding to LPD results.•The pilot-scale LPD supports application to industrial cleaning-in-place practice.

The performance of industrial cleaning in place (CIP) procedures is critically important for food manufacture. CIP has yet to be optimised for many processes, in part since the mechanisms involved in cleaning are not fully understood. Laboratory tests have an important role in guiding industrial trials, and this paper introduces and compares two experimental techniques developed for studying CIP mechanisms: local phosphorescence detection (LPD), and scanning fluid dynamic gauging (sFDG).To illustrate the comparison, each technique is used to investigate the influence of soil topology on the cleaning of pre-gelatinised starch-based layers from stainless steel (SS 316) substrates by aqueous NaOH solutions at ambient temperature. The roughness of the soil surface is varied by incorporating zinc sulphide particles with different particle size distributions (range 1–80 μm) into the starch suspensions. The soil roughness increased with the use of larger particles, increasing the 3D arithmetic mean roughness (Sa) of the dry layers (range 0.37–3.33 μm). Rough layers were cleaned more readily than those containing small inclusions, with a good correlation between the cleaning rates observed during LPD and FDG measurements. The LPD technique, which is an instrumented CIP test, gives a better indication of the cleaning time, while sFDG measurements provide further insight into the removal mechanisms.

Keywords
CIP, cleaning in place; CFD, computational fluid dynamics; FDG, fluid dynamic gauging; LPD, local phosphorescence detection; NaOH, sodium hydroxide; PMMA, poly(methyl methacrylate); PVC, poly(vinyl chloride); RO, reverse osmosis; sFDG, scanning fluid dyna
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A comparison of local phosphorescence detection and fluid dynamic gauging methods for studying the removal of cohesive fouling layers: Effect of layer roughness
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 92, Issue 1, January 2014, Pages 46–53
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