It is not possible to judge which atomization effect is better by the diameter of the disc alone. At the same rotational speed, the larger the diameter, the higher the linear velocity and centrifugal acceleration of the disk edge, and the longer the liquid film spreading path, which is generally more conducive to the thinning of high-viscosity coatings and the formation of finer liquid filaments at the disk edge; but at the same time, it will increase the risk of rotational inertia, driving load, air resistance, mechanical stress, dynamic balance sensitivity and fine mist drift. If the same disk edge line speed is maintained, the required rotational speed of the large-diameter disk is lower, and the actual atomization and shearing still depend on the disk surface structure, flow rate, coating rheology, temperature, and disk edge geometry. 170, 220, and 250 mm can only be used as test sizes, and cannot be directly sequenced from specific equipment and coatings.
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