Molecular details
concerning the induction phase of milk fouling
on stainless steel at an elevated temperature range were established
to better understand the effect of temperature on surface fouling
during pasteurization. The liquid–solid interface that replicates
an industrial heat exchanger (≤75°C), including four stages
(preheating, heating, holding, and cooling), was investigated using
both a quartz crystal microbalance (QCM-D) and a customized flow cell.
We found that the milk fouling induction process is rate-limited by
the synergistic effects of bulk reactions, mass transfer, and surface
reactions, all of which are controlled by both liquid and surface
temperatures. Surface milk foulant becomes more rigid and compact
as it builds up. The presence of protein aggregates in the bulk fluid
leads to a fast formation of surface deposit with a reduced Young’s
modulus. Foulant adhesion and cohesion strength was enhanced as both
interfacial temperature and processing time increased, while removal
force increased with an increasing deposit thickness. During cleaning,
caustic swelling and removal showed semilinear correlations with surface
temperature (
T
S
), where higher
T
S
reduced swelling and enhanced removal. Our
findings evidence that adsorption kinetics, characteristics of the
foulant, and the subsequent removal mechanism are greatly dependent
on the temperature profile, of which the surface temperature is the
most critical one.
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