Basal state and powder clinging

Measurement of Friction Coefficient on a Powder Layer and Fluid Dynamic Study

Whether or not powder adheres to the base of disk depends on a basal state of the disk.

In our experiments, there are the following three types of basal state for the disk, and they are distinguished by symbols in this thesis.

Powder used in the sliding is adhered to the base using spray paste and dried: S
Smooth metal: M
Filter paper pasted onto base: P

However S and M are not distinguish in text because no difference was found between result using S and P.

Flour and starch clings onto the base of S or P but not onto M. Silica sand cling onto neither base type.

Appendix Table 1. Relation between the basal state of the disk and clinging of powder.

	basal state: S	basal state: M

flour	cling	do not cling
starch	cling	do not cling
silica sand	do not cling	do not cling