NDLI: Modelling of a high pressure calorimeter : Application to the measurement of the latent heat of a model food (tylose)

Content Provider	Springer Nature Link
Author	Ousegui, A. Zhu, S. Ramaswamy, H. S. Le Bail, A.
Copyright Year	2006
Abstract	The evaluation of the latent heat and enthalpy of fusion of food systems in the case of high pressure–low temperature processing is important for modelling purposes as well as for technical applications. A high pressure calorimeter has been designed for this purpose. The high pressure calorimeter was used to evaluate the latent heat during a pressure scan at constant temperature. It permits to measure the heat of phase transitions and to obtain the relationship between the initial freezing temperature T $_{ifp}$ and the average pressure while the phase transition is going on.This work presents a modelling of results obtained from an experimental approach using a high pressure calorimeter and from a mathematical model developed from existing data on the phase change of pure water.The modelling work consisted in evaluating the latent heat measured in previous tests from computations taking into account the dependence of the latent heat of fusion of water on pressure. Models predicting the amount of frozen water in a food matrix under atmospheric conditions were used to determine the initial amount of frozen water in the sample. Then a stepwise procedure was operated in a program to reproduce the pressure rise occurring during a high pressure calorimeter test. The amount of melted ice at each pressure step was calculated using conventional ice fraction models, which were adapted to pressure dependence of the initial freezing temperature and the dependence of the latent heat pressure. The comparison was satisfactory, especially at low temperatures.
Starting Page	243
Ending Page	248
Page Count	6
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	86
Issue Number	1
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-09-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	calorimetry high pressure initial freezing temperature latent heat phase transition Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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