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Circulation Cleaning¹

Department of Dairy Industry, Department of Agricultural Engineering, and School of Veterinary Medicine, University of California, Davis

ABSTRACT

The relationship between cleaning effectiveness and variables such as temperature, turbulence, time, and detergent fraction was studied on test discs. Cleaning effectiveness was evaluated by using P³²-labeled milk. It was determined that in vitro additions of radioactive phosphorus serve as indices of both organic and inorganic milk residues.

Because the relationship of fluid flow to cleaning effectiveness is probably a function of turbulency, the data concerned with fluid flow were calculated on the basis of Reynolds numbers. The abrasive effect of a suspension of plastic beads was found to contribute to cleaning, particularly in cases of burn-on. The results of this study indicate that 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.

¹ This study was supported in part by a grant from the United States Atomic Energy Commission.