Abstract
In this paper, the squeeze flow behavior of Newtonian fluid was investigated with a series of squeeze tack laboratory experiments. The Newtonian fluid was squeezed out radially between two parallel and circular plates. From the flow curves obtained in the squeeze tack experiments, rheological parameters such as yield stress in tension and in squeeze, have been investigated. The results indicate that the values of yield stress in squeeze and in tack of the testing material are relatively small. These values gradually decrease with increasing sample thickness. This shows that the squeezing and tacking process does not affect the testing material, glucose in this case. Although the experimental results are not much, a linear relationship can be found between tensile and squeeze stress of Newton fluid in the experiment. This is especially evident at low test speeds
Highlights
Newtonian fluid is a viscous liquid, obeying the Newton’s law of internal friction, which means that the tangential stress and velocity gradient are linearly dependent on each other
Flow curves of the experimental results determine that the testing material is Newtonian
The squeeze flow is a simple and effective method for the rheological characterization of materials in a wide range of consistencies, providing important information regarding the rheological behavior of materials in practical applications
Summary
Newtonian fluid is a viscous liquid, obeying the Newton’s law of internal friction, which means that the tangential stress and velocity gradient are linearly dependent on each other. This method has the limitation of not fully evaluating material characteristics in shear [1, 2] There should be another method of measuring more characteristics, tracking the variation of those features over time, etc. These methods should be thoroughly investigated, first of all with Newtonian fluids. The squeeze flow experiment of Newtonian fluids is important for understanding the characteristic of the shear thickening materials under shearing and towards more efficient applications. Critical shear rate of the test material strongly increases with the increasing gap in a simple shear flow To this end, studying the shear viscosity in the squeeze mode will contribute to the understanding of the rheological properties under moving boundary.
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