分散板後流領域における製紙用パルプ液の流れ特性

抄録

We have investigated the influence of flow velocity on the fiber distribution of a wood pulp suspension in wake region behind a flat plate inserted in a channel. This study was considered to understand the behavior of the pulp fibers in the hydraulic headbox of papermaking machines. The wake flow of pulp suspension was firstly visualized, and then the distribution of pulp fibers was obtained by optical techniques. The time-averaged and fluctuating fiber concentrations exhibit a complicated distribution that depends on the thin water layer formed on the flat plate and the shear layer generated at the trailing edge of the plate. The partition plate is slightly effective for obtaining a uniform time-averaged fiber concentration distribution and for making the fluctuating fiber concentration lower.