Adhesion of Dust and Powder by Anatolii D. Zimon (auth.)

By Anatolii D. Zimon (auth.)

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Thus, in determining the coefficient of removal, it is necessary to know the probabilities of particle detachment and removal. The detachment probability is in turn determined by the average adhesive force and the detaching force [23] . In order to test the validity of Eqs. 68. A steel surface was used in this work (plates with a Class 5 finish). On the basis of the experimental data, the average adhesive force and the detaching force were determined in relation to particle size; these relationships are shown in Fig.

55), be equal to the magnitudes of the forces of adhesion of the powder layer Fl. When Fn» Fo , as we can see from Eq. 51), the two-term law becomes Amontons' law. , 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].

Up to the present time, the area of actual contact between a particle and a surface has not been determined, and the use of the Hertz formula in calculating this area is only tentatively justified. The influence of the contact area on the force of adhesion can thus far be evaluated only indirectly. 05 dyn). This difference is explained by deformation of the area of contact with the polyamide plate since the deposition of dust on these surfaces was accompanied by additional pressing of the particles onto the surface as a result of the vibration [64] .

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