2nd International Conference on Rheology , 2021-12-14

Title : ( Effect of concentration and temperature on the steady shear flow behavior of Nettle seed (Urtica pilulifera) gum )

Authors: zahra zamani , Seyed Mohammad Ali Razavi ,

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Abstract

The steady shear flow behavior of Nettle seed gum (NSG) was investigated between 3% and 5% (w/w) concentration and temperatures of 10–70 °C. NSG showed shear thinning behavior at all concentrations and temperatures. The Herschel–Bulkley model was employed to characterize the flow behavior of NSG solutions at the shear rate of 14–400 s-1. When the concentration increased from 3% to 5%, the flow behavior index decreased significantly from 0.927±0.021 to 0.686±0.065 with increasing concentration, indicating more thickening, stabilizing, and pseudoplasticity functions at higher concentrations. The dependence of viscosity on temperature was evaluated by applying the Arrhenius-type model. The activation energy for the NSG was calculated as 18.88 kJ/mol at 3% concentration, which was almost equal to values reported for Nettle seed (Urtica dioica) gum. When the shear rate increased, the NSG flow behavior became more the same as Newtonian behavior, and No gelling influence was seen by increasing the temperature.

Keywords

, Hydrocolloid, Pseudoplasticity, Rheology, Shear viscosity, Urtica pilulifera seed gum
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@inproceedings{paperid:1088002,
author = {Zamani, Zahra and Razavi, Seyed Mohammad Ali},
title = {Effect of concentration and temperature on the steady shear flow behavior of Nettle seed (Urtica pilulifera) gum},
booktitle = {2nd International Conference on Rheology},
year = {2021},
location = {تهران, IRAN},
keywords = {Hydrocolloid- Pseudoplasticity- Rheology- Shear viscosity- Urtica pilulifera seed gum},
}

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%0 Conference Proceedings
%T Effect of concentration and temperature on the steady shear flow behavior of Nettle seed (Urtica pilulifera) gum
%A Zamani, Zahra
%A Razavi, Seyed Mohammad Ali
%J 2nd International Conference on Rheology
%D 2021

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