MODELING AND CALCULATION OF DESIGN AND OPERATING PARAMETERS TURBINE MIXER FOR SOLUTION DISPERSION POLYMER COMPOSITES
Abstract
Mixers with technical characteristics established by GOST 20680-2002 are not suitable for mixing solutions of polymer nanocomposites when restoring bearing fits. The optimal design parameters of a multi-bladed turbine mixer with full-length inclined blades for mixing solutions of polymer nanocomposites were determined at the Lipetsk State Technical University. Formulas for calculating the pumping effect and power when designing multi-blade turbine mixers of various sizes are obtained using these parameters. The average value of the peripheral speed coefficient, which is k≈0.92, was determined experimentally. A formula for calculating power when designing multi-blade turbine mixers of various standard sizes with full-length inclined blades is proposed. The experiment showed a high convergence of calculated and actual values of power consumed by a turbine mixer when mixing nanocomposite solutions. An experiment was carried out to evaluate and select a similarity criterion for the design of multi-bladed turbine mixers of various standard sizes. Reynolds and Froude similarity criteria were studied. The light transmission coefficient of the solution after stirring at a rotation frequency determined by the Reynolds criterion is Kc=57%. A similar parameter of the solution after treatment in the mode determined by the Froude criterion is 2.2 times lower and amounts to Kc = 26%. A higher quality index according to the Froude criterion is confirmed by the fact that the strength of the samples is σ = 27.308 MPa, which is 1.24 times greater than the strength of samples obtained from nanocomposite solutions processed in the mode determined by the Reynolds criterion. A formula for calculating the power of multi-bladed turbine mixers with inclined blades was proposed as a result of the research. Modeling of the design and operating parameters of multi-blade turbine mixers of various standard sizes should be carried out according to the Froude criterion.