OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 where 2 1 exp(2.3288 6.4581 2.4486 ) b = - j + j ; 2 0.0964 0,5565 b = + j; 2 3 3 exp(4.905 13.8944 18.4222 10.2599 ) b = - j + j - j ; 2 3 4 exp(1.4681 12.2584 20.7322 15.8855 ) b = + φ - j + j ; j is a non-spherical shape constant; j = s/S, where s is the surface area of a sphere having the same volume as a particle; S is the particle surface area. The spherical drag coefficient was determined according to Morsi and Alexander [30, 39]: 2 3 1 2 Re Re D a a C a = + + , 1 a , 2 a , 3 a – constants. An additional study using Oka erosion model was conducted to estimate the influence of shape factor, which is presented in fig. 14. Fig. 13. Typical wear surface after testing Fig. 14. The effect of the “shape factor” (for Oka coefficients 90 0.004 E = , 1 0.613 n = , 2 6.439 n = , 2 2.21 k = , 3 0.19 k = )
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