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Evaluation and comparison of thermal conductivity of food materials at high pressure

Paper ID Volume ID Publish Year Pages File Format Full-Text
19407 43063 2008 7 PDF Available
Title
Evaluation and comparison of thermal conductivity of food materials at high pressure
Abstract

Thermal conductivity of foods at high pressure (HP) is important for understanding the thermal response of food products during HP processing. Available information is still very limited. In this study, a line heat source (LHS) probe was installed in a HP vessel to evaluate pressure-dependent thermal conductivity of food and related materials. The probe was calibrated using agar gel (2%, w/w), resulting in an excellent linear agreement between measured values and reference data of pure water. Experiments were conducted to determine thermal conductivity of several materials at pressures up to 350 MPa and initial temperatures of 5 and 25 °C. At given temperature and pressure, thermal conductivity depended on the nature of test samples and ranked in the decreasing order: water > fresh potato > Tylose > chicken breast > salmon fillet > cheddar cheese. Thermal conductivity was sensitive to both pressure and temperature, increasing with both. Polynomial regression model was found to give a good fit for thermal conductivity as a function of pressure both at 5 or 25 °C. Results from this study were generally comparable to available published values thereby indicating the usefulness of the experimental approach for thermal conductivity data gathering.

Keywords
High pressure; Thermal conductivity; Food; Line heat source
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 86, Issue 3, September 2008, Pages 147–153
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us