Removal of glass particles from a glass plate placed in an ultra-centrifuge equipped with angle roter was conducted under various conditions with regard to particle diameter, washing time, and rotations per minute (rpm) of the centrifuge. The contribution of vertical component, F
v of the centrifugal force to removal was assessed at a constant horizontal component,
Fh. The following results were obtained.
1) Removal efficiency increased with particle diameter and with washing time, and was proportional to rpm which was in the range 14 × 10
4 rpm for small particles, and in the range 110 × 10
3 rpm for large particles.
2) Removal efficiency increased with decrease in
Fv at constant
Fh, finally reaching maximum efficiency at
Fv=0. Removal force attained by centrifugal force
F2 (when
Fv=0) and that by lamminar flow
F1 were essentially the same at 7085% removal.
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