By Anatolii D. Zimon (auth.)
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Extra info for Adhesion of Dust and Powder
When a detaching force is acting at an angle of 30,60,90, 120, or 150° to the dust-covered substrate in air (positions 2-6), the detached particles are immediately removed from the surface. If the detaching force is acting at an angle of 180, 210, or 240° (particles lie on the surface in positions 7-9), as the particles move they will retain direct contact with the surface. In this case, kinetic friction occurs between the surface and 0L----5LO----L---~--~----3~D-0---d~· I 2 a ! 4 ! 10 5 8 Particle position, b I 12 Fig.
10 5 8 Particle position, b I 12 Fig. 6. 1 . 10-3 dyn. 26 CHAPTER I particles. In the detachment of particles adhering to the lower side of a horizontal plane (positions 11, 12, and 1), in addition to the centrifugal force, the force of gravity tends to break contact between the removed particles and the surface. In an air medium, 'Yn > 'Yt. An analogous relationship was observed by G. I. 8 to 15IJm in water and in solutions of certain electrolytes. 0 times 'Yt, depending on the electrolyte concentration.
Hence this coefficient could be used in calculating the adhesive force of a powder layer formed by particles of different sizes on monotypical substrates under identical conditions. In subsequent studies [27 - 29] , however, the coefficient a was found to vary with the particle size, thus casting some doubt on the correctness of the calculations of Cremer et al. . 41) where N is the original number of particles, r is the particle radius, F; is the specific force of adhesion. The specific force of adhesion is defined as the force of adhesion of a layer of adherent particles as calculated for unit surface occupied by this layer.