Circulation Cleaning

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Abstract
The relationship between cleaning effectiveness and variables such as temperature, turbulence, time and detergent fraction was studied on two types of stainless steel test discs. Data obtained with flat test discs suspended in the center of a stream correlated well with data from discs which formed a part of the inner wall of the pipe. Cleaning effectiveness was evaluated with P32 labeled milk, and it was determined that in vitro additions of p32 served as indices of both organic and inorganic milk residues. Those data concerned with fluid flow were calculated on the basis of Reynolds numbers. Results indicate turbulency is of primary importance to cleaning, with temperature less significant. As the physico-chemical effectiveness of the deterging medium is increased, the effect of temperature and turbulence becomes less pronounced. The abrasive effect of a suspension of plastic beads was found to contribute to cleaning, particularly in cases of burn-on.

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