The experimental setup (Fig. 1) is an ultra high temperature
(UHT) laboratory scale plant (Armfield FT174X, Ringwood, UK).
This system includes a feed tank, a pre-heater unit made of helical
tubes in a water bath, a heating section with a heat exchanger
made of a succession of eight concentric double tubes, a helical
holding tube with variable length and a cooling section similar to
the heating one.