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By Anatolii D. Zimon (auth.)

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Fn (for microscopic particles this is difficult to accomplish since the adherent particle is acted upon only by its actual weight), or by reducing or eliminating the force of adhesion. The force of adhesion can be eliminated if friction is measured in a liquid medium, where, because of the disjoining pressure, molecular forces of interaction between the surfaces cannot be manifested [38]. From Eq. 55) it follows that the evaluation of adhesion on the basis of the magnitude of the detaching force (mg sin a) is not exact since when the angle a is changed, there will also be a change in pressure of the powder on the surface (mg cos a), which in tum affects the interaction of the particles with the surface.

This provides grounds for the statement that, by the use of the probability method, the coefficient of removal can be determined. From this discussion, it can be seen that the efficiency of removal of adherent particles from different surfaces may be characterized not only by the adhesion number, but also by the coefficient of removal, which is a function of the probability of detachment and removal of the adherent particles. , Fav = f(d), and if the detachment force Fdet = f(d) is fixed, the method we have just examined can be used to determine the probability of particle detachment over a range of sizes from d min to d max .

49) by Eq. 0 46 CHAPTER II covered with a layer of chromium, and a flat quartz surface with layers of chromium of different thickness deposited on the quartz flat, in relation to the gap between the contiguous bodies: H. 10 2 , /lm . B . 10 19 (in erg· cm) with indicated 18 24 28 thickness of chromium layer: 80 A 380 A .. 20) . 10- 19 ergs· cm. For quartz surfaces covered with a layer of metal, the constant B takes on higher values, increasing with increasing thickness of the metal layer [62].

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