The

frictional coefficient [lambda] is represented similarly to equation 12 for smooth bore tube of constant diameter (D), but with [C.

As mentioned earlier, calculating

frictional coefficient in area of mixed lubrication requires knowledge of contact surfaces boundary

frictional coefficient.

The

frictional coefficient is proportional to the pressure or normal force, in this case [F.

Equation 24 indicates that the compaction coefficient is influenced by the geometrical parameters of the equipment,

frictional coefficients and K.

That is, the oscillation width is determined by the difference between the static and dynamic

frictional coefficients.

In particular, not only are good tribological properties such as low

frictional coefficient, stability, and low wear required but also suitable mechanical properties such as strength, stiffness and impact strength, and high mold-ability, which allow flow molding such as compression and injection molding for mass production are essential.

When the applied load increased further, more wear debris adhered onto the steel ball, a complete transfer film was quickly formed, and the

frictional coefficient decreased.

9), (10), using small loadings of zinc oxide (ZnO) nanoparticles (<1 wt%) in a PC matrix reduces both the wear rate and

frictional coefficient of the PC.

It enhanced with the residuals and holding the various

frictional coefficients.

b] are the

frictional coefficients between the material and the surface of the rotor, the surface of the stator, and the surface of the baffles, respectively.

Besides these parameters, Spiegler (1958) used frictional model equations in which the interactions between all pairs of components (membrane, water and solute) are characterised by resistance and

frictional coefficients, which is one of the fundamental treatments of trans-membrane transport processes (Spiegler 1958).

The shallow feed depth or low compression ratio is also appropriate to the

frictional coefficients of RPVC, which cause it to feed well.