Design of a test rig for cleaning studies and evaluation of laboratory‐scale experiments using pink guava puree as a fouling deposit model

• Main Authors: Khalid, Nurul Izzah, Nordin, Norbismi, Abdul Aziz, Nuraini, Ab. Aziz, Norashikin, Taip, Farah Saleena, Anuar, Mohd Shamsul
• Format: Article
• Language: English
• Published: Wiley Periodicals 2015
• Online Access: http://psasir.upm.edu.my/id/eprint/36992/1/Design%20of%20a%20test%20rig%20for%20cleaning%20studies%20and%20evaluation%20of%20laboratory%E2%80%90scale%20experiments%20using%20pink%20guava%20puree%20as%20a%20fouling%20deposit%20model.pdf; http://psasir.upm.edu.my/id/eprint/36992/; https://onlinelibrary.wiley.com/doi/abs/10.1111/jfpe.12188

A cleaning‐in‐place (CIP ) test rig is commonly used to investigate the cleanability of food apparatus. The main focus of this work was to design a laboratory‐scale cleaning test rig that operates at a fluid velocity of up to 2 m/s (Re = 2.5 × 105) and that is capable of withstanding contact with detergents and disinfectants at temperatures from 20 to 70C. The design followed the standard design of a recirculating water tunnel that includes a test section. Computational fluid dynamic simulation was performed to find the minimum entry length to obtain fully developed flow at the test section. Cleanability of a flat stainless steel plate was investigated using pink guava puree as a physical fouling deposit model. The CIP process only considered the alkaline cleaning stage at cleaning condition of 0–2.0 wt % NaOH , 35–70C and 0.6–1.5 m/s. In general, removal of fouling deposit increased with increasing chemical concentration, temperature and velocity. These findings may be used to improve the CIP for real conditions in the food industry.