APPARENT VISCOSITY OF MYRTLE PULP INTEGRAL IN DIFFERENT TEMPERATURES

Authors

  • Regilane Marques Feitosa Federal University of Campina Grande image/svg+xml
  • Rossana Maria Feitosa de Figueirêdo Federal University of Campina Grande image/svg+xml
  • Alexandre José de Melo Queiroz Federal University of Campina Grande image/svg+xml
  • Elisabete Piancó de Souza Federal University of Campina Grande image/svg+xml
  • Vidina de Melo Silva Federal University of Campina Grande image/svg+xml

DOI:

https://doi.org/10.1590/1983-21252015v28n426rc

Keywords:

Eugenia gracillima Kiaersk. Rheology. Arrhenius.

Abstract

In fruit pulp industrialization often use thermal processes to (heating and/or cooling) that may cause changes in its viscosity, which causes the study of the influence of temperature on the rheological behavior of this type of product is of great importance. Data of the apparent viscosity of fruit pulp are used in equipment design and process optimization. The research objective was to evaluate the influence of temperature on the apparent viscosity of the Myrtle pulp. The rheological analysis was conducted on a Brookfield viscometer model DV-II +Pro. The apparent viscosity curves as a function of strain rate were described by rheological models Sisko, Power Law, and Falguera-Ibarz. The full Myrtle pulp was classified as non-Newtonian fluid and shear thinning. The behavior of this fluid can be well described by models Sisko, Law of Power and Falguera-Ibarz, especially the Sisko model. The effect of temperature on the apparent viscosity was described by Arrhenius equation with activation energy presenting high values at low shear rate.

Published

19-11-2015

Issue

Section

Food Engineering