Evaluation of Some Rheological Properties of Xanthan Gum
The squeeze flow behavior of a shear thinning fluid was studied in this paper using squeeze tack technique. The test material was firstly squeezed out between two parallel circular plates, then it was relaxed for 1.5min and finally was separated at a predefined pulling velocity. From the flow curves obtained in the squeeze tack experiments, the rheological parameters, including yield stress in tension and in squeeze, have been calculated. The results show that the squeeze-tack test can be used for the analysis and evaluation of shear thinning fluids. Although the experimental results may not be considered complete, it can be seen that the stresses and tensile stresses have a linear relationship witch goes through the origin.
Keywords:squeeze flow technique, xanthan, yield stress, shear thinning fluid
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