A Study of Flow Properties of Paper Stock Suspension

Abstract

The authors measured the pipe friction losses up to consistency of about 6%, using groundwood pulp suspensions which have comparatively stable properties for flow, with brass pipes 23.3, 36.6, and 48.8 mm in diameter and galvanized gas pipes 1", 11/2", and 2". As the results, the pipe friction coefficients λ vs. a new dimensionless number : [numerical formula] (N is flow number, ρ : density, v : mean velocity in pipe and τ_w : shearing stress on pipe wall) which corresponds to Reynolds number in the case of water, coinciding well on the line of λ=64/N. Moreover, the authors gave the calculation formulas of pipe friction losses which are more accurate thao previous ones.