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DISSIPATIVE METHOD OF RESEARCH OF HIGH-VISCOSITY MEDIA RHEOLOGICAL PROPERTIES

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The rheological properties research of highly viscous fluid is attractive from both practical and scientific points of view. The research is necessary in the calculation of energy cost of production, equipment, and in the research of their structure of media and flow rules. In general, the rheological properties research of highly viscous fluids, which demonstrate non-Newtonian fluid properties, are carried out on the rotation and capillary viscometers. However, it is rather difficult to use the data obtained in this way in the technical calculations of the equipment. The reason is the difference in hydrodynamic conditions on which the viscosity of non-Newtonian fluids depends. A method for studying the rheological properties of highly viscous fluid is considered based on on the conversion of friction mechanical energy to the heat energy during agitation. The necessity of using the proposed method in rheological studies of highly viscous media has been substantiated. Theoretical explanation of the physical essence of the method is presented and the equation for viscosity calculation is derived. An experimental verification of the suggested method was carried out using the example of determining the viscosity of glycerin aqueous solution at 95 % concentration; the obtained data are compared with known results from the literature. The discrepancy between the experimental and calculated values of the power criterion was no more than 14 %.

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