Visualisationof the cleaningof milkand whey proteinconcentratedeposits
(suchas Christian, 2004 ; Birdand Bartlett,1995;Grasshoff,1989)haveshown
the non-uniformnatureof deposit removal,i.e. the depositis removedin discrete
islands. The processhas threestages(Fig. 29.1(a)):
Fig. 29.1 Schematicdiagramsof typicalcleaningcurves(a) shapeof removalcurves(b)
effectof processvariableson eachstageof cleaning(bothfromGillham,1997).
Improvingthe cleaning of heatexchangers 477