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By Anatolii D. Zimon (auth.)

ISBN-10: 1461585767

ISBN-13: 9781461585763

ISBN-10: 1461585783

ISBN-13: 9781461585787

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Extra resources for Adhesion of Dust and Powder

Example text

53), have different dimensions. The constantA is usually given in ergs, and the constant B in ergs· cm. The constants A and B can be determined by calculation, using Eqs. 44), and also on the basis of experimental data. In the latter case, it is necessary to measure the force of interaction of the bodies with a fixed gap between them, while observing conditions that will eliminate the effect of all components of adhesive interaction other than the molecular component. Let us examine the determination of the constant A in the case in which there is direct contact of the particle with the surface.

7 cm 2 . FUNDAMENTAL CONCEPTS OF PARTICLE ADHESION 29 the specimen dimensions. 51). We should emphasize once more that Eqs. 51) and (I. 52) are confirmed in practice if one of the contiguous bodies is made of a plastic material [33, 34] . If the actual and nominal contact areas are markedly different, the force of adhesion can give only an increase in actual contact area of the mating surfaces. 53) where l1ad and I1p are the coefficients of friction due to adhesion and pressure. 18. , the adhesion of bodies that are not in direct contact with each other but are located at a distance such that molecular interaction between the bodies affects the adhesion.

We should emphasize once more the difference between the interaction of individual molecules and the molecular interaction of condensed systems, in relation to the magnitude of the gap separating them. For individual molecules, the interaction is inversely proportional to H6 and the force to H7 ; for condensed systems, it is proportional to Hand H2 , respectively, for two spherical particles (or a partile and a plane) and to H2 and H3 for two planes. On the basis of Eqs. 26), we can calculate the energy and force of interaction between two bodies as a function of the gap separating them.

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

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