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What is Extensional Rheology in Food Processing about?

Among fluid flows practiced in industrial processes, extensional and shear flows are important ones. Measurements of extensional viscosity ηE of liquid foods are important in structural characterization, process and quality control of products, and process modeling and design. These measurements are incomparably more difficult than for the shear viscosity, because of variation of sample dimensions in time when the sample is extended at a constant strain rate. This chapter discusses the methods for measuring the extensional viscosity of fluids with low and high viscosities. Measurements of extensional viscosity are made not only with commercial apparatus but also with special custom-built devices. Measurements of ηE of fluids having a viscosity lower than 1Pa/s are particularly troublesome. In addition, typical results of measurements of polymer solutions, emulsions, and other fluids will be presented, as well as the theoretical basis related to the issue of extensional viscosity.

Author

Sylwia Różańska

Publisher

Elsevier Science & Technology

Published

2023

Language

EN

ISBN

9780128239834

Subjects

Science, Stem