3.3.1. Time resolved values
The evolution of the heat fluxes during the production of the
ice slurry is depicted in Fig. 8 for different operating conditions
(type of scraper, scraping speed and logarithmic mean temperature
difference). Fig. 8a and b correspond to two different
values of DTlog, averaged during the freezing stage of the
experiment (see Fig. 5), from the nucleation start until a 20% of
ice content is reached. The effects of different scraper systems
and scraping velocities are compared in each figure. The
starting of the freezing stage can be recognized distinctively
by the stabilization of the heat flux, which is a consequence of
the stabilization of the process temperature. The heat transfer
coefficients corresponding to the heat fluxes shown in Fig. 8a
and b, calculated according to Eq. (10), are represented
respectively in Fig. 9a and b.