Study on the tubular pinch effect in a pipe flow. (2nd report, laminar pipe flow of suspensions).

Abstract

To clarify the mechanism of the tubular pinch effect of suspensions, experimental investigations are carried out on the basis of the results obtained by a study on a single particle reported in our previous paper . By rearranging the experimental results with the particle Reynolds number Rep, it was confirmed that the tubular pinch effect of suspensions may be essentially similar to that of a single particle. But if Rep increases, the influence of the interaction of particles appears. Especially, when Rep becomes greater than about 10SUB-SUB1, a necklace-like formation of particles appears and develops. And this is the main reason for the tubular pinch effect in that region of Rep . (A)