製紙用パルプ液の管内流れについて

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  • A Study on Flow of Wood Pulp Slurries in Pipe Line
  • セイシヨウ パルプエキ ノ カンナイ ナガレ ニ ツイテ

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At low velocities the flow of wood pulp slurries is similar to the flow of Bingham fluid, and the thin water film exists between the wall and the main body of the pulp during pulp flow at most velocities excepting low velocities. The author shows that the coefficient of pipe friction loss f is a function of the single dimensionless number Re*= {8ρpua2α}/τy through all velocities (ρp=density, ua=average velocity, τy=yield stress, a=re1ative plug radius). Moreover, the singularity on pressure drop of the flow of sulphite pulp (the pressure drop shows a slight decrease with an increasing velocity and at higher velocities the pressure drop again increases with an increasing velocity) is explained qualitatively.

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