Processing may take a few seconds...



Extensional rheology in food processing


[ 1 ] Instytut Technologii i Inżynierii Chemicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[6.5] Chemical sciences

Year of publication


Chapter type

chapter in monograph

Publication language


  • extensional viscosity
  • Trouton ratio
  • filament thinning
  • polymer solutions
  • emulsions

EN Many kinds of flows are present in industrial processes in which extensional and shear flows are among important ones. Measurements of extensional viscosity ηE of liquid foods are important in structural characterization, process and quality control of products and process modelling and design. These measurements are incomparably more difficult than for the shear viscosity, because of variation of sample dimensions in time when sample is extended at a constant strain rate. This chapter will discuss 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 constructed devices. Measurements of ηE of fluids having a viscosity lower than 1 Pa∙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 issue of extensional viscosity.

Date of online publication


Pages (from - to)

143 - 180



Advances in Food Rheology and Its Applications. Development in Food Rheology

This website uses cookies to remember the authenticated session of the user. For more information, read about Cookies and Privacy Policy.