Abstract
LSTU has developed a turbine stirrer for mixing and dispersing solutions of polymer nanocomposites designed to restore mounting holes in the body parts of equipment. Formula is proposed for calculation of optimal rotation frequency of turbine mixer, which takes into account structural parameters of mixer and physical properties of nanoparticles, which provides effective mixing of nanoparticles of filler in solution of nanocomposite. An experiment was carried out to assess the adequacy of a mathematical model of the turbine stirrer speed. Experimental turbine agitators of three different sizes were used in the experiment. A solution of elastomer nanocomposite F-40S was used for mixing. The dispersion quality was evaluated by the light transmission coefficient. For each turbine stirrer size, experimental non-linear dependences of the transmittance on the stirrer speed were obtained. After approximation of experimental dependences and taking partial derivatives, their extremes are determined, i.e. actual optimal rotation frequencies for each mixer size: n оф1 = 1325 min-1; nof2 = 1113 min-1;, nof3 = 973 min-1. Then the power consumed by stirrers of various sizes at a speed of 500, 1000 and 1500 min-1 was measured. Further, the values of the circumferential velocity coefficients k were calculated for each stirrer using the measured power values. As the stirrer diameter increases from 34 to 90 mm, the corresponding circumferential velocity factor k increases from 0.9534 to 0.9703, indicating an increase in circumferential flow.Further, according to the proposed formula, using the values of the coefficients of peripheral speeds, the calculated values of the optimal speed for stirrers No. 1, No. 2 and No. 3 were obtained: n op1 = 1307 min-1; nop2 = 1100 min-1;, nop3 = 965 min-1. Analysis of variance showed that the calculated Fischer value does not exceed the table value, which confirms the adequacy of the formula for calculating the optimal speed of the turbine stirrer.
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