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A METHOD FOR MEASURING THERMAL TIME DISTRIBUTIONS IN CONTINUOUS FLOW HEAT EXCHANGERS
Author(s) -
ELLBORG A.,
TRÄGÅRDH Ch.
Publication year - 1994
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/j.1745-4530.1994.tb00340.x
Subject(s) - heat exchanger , flow (mathematics) , mechanics , chemistry , thermal , turbulence , dextran , tube (container) , hydrolysis , thermodynamics , polymer , materials science , chromatography , composite material , physics , biochemistry , organic chemistry
This study deals with the distribution of heat treatment of liquids which flow through heat exchangers. the distribution is induced by the combined effect of velocity and temperature gradients and is referred to as the thermal time distribution (TTD). A tracer technique based on the acid hydrolysis of dextran was developed for assessing the TTD. the change in the shape of the molecular weight distribution (MWD) of the polymer during the course of the reaction was found to be related to the TTD exposure of the fluid and the shape of the MWD could be described by means of statistical moments. A computer‐based model for simulating the TTD in a tube heat exchanger, in turbulent flow, was developed together with a model for simulating the effect of the TTD on the change in the MWD during dextran hydrolysis. the simulation model gave results that were in qualitative agreement with the experiments.