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

By Anatolii D. Zimon (auth.)

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Such flattening cannot occur if the actual contact area and the nominal contact area of the two bodies are equal. , separate steel surfaces [34]. Moreover, above a certain pressure, the nominal contact area of two surfaces remains practically unchanged. When the areas of actual and nominal contact are equal, the linear plot of frictional force Ffr against the normal load Fn does not pass through the coordinate origin Ffr = f(Fn). In this situation, we can extrapolate the straight-line plot to the case in which Fn = 0 and thus find the magnitude of the adhesive force.

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. Apart from Eqs. 26), the energy of molecular interaction can be determined in terms ofthe heat of sublimation [40] .

2-3) . 10 9 dyn/cm 2 • With allowance for electromagnetic lag, and with a gap of 20 A between these surfaces, the force of interaction is 3 . 5 . 106 dyn/cm 2 [63]. If the gap is increased to 104 A, the force of interaction drops to 5 . 10-3 dyn/cm 2 [60]. Experimental data on the change in molecular interaction as a function of the gap separating the contiguous bodies offer the possibility of testing the validity of Eqs. 42). It was found in [57] that, in all cases of interaction of a spherical surface with a plane surface, the relationship between log F and log H is linear and has a slope equal to 3; i.

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