非ニュートン流体の混合時間

概要

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Using a paddle type impeller whose ratio of width to span was larger than usual, an axial dispersion coefficient in a mixing vessel of a clay suspension was measured by radioisotope technique (P^<32>). The clay suspension studied was assumed to be a Bingham fluid judging from the flow curve determined with a concentric double-cylinder type viscometer.The experimental results of dispersion coefficients were arranged based on dimensional analysis. Values of the mixing time in the clay suspension were calculated therefrom.The effect of rotational speed of the impeller used on the mixing time seemed to be markedly large comparied with that for Newtonian fluids.As control experiments, aqueous solutions of glycerine and water were also used.The empirical formulae which have been reported by other workers on the mixing time of Newtonian fluids were reviewed carefully. It was found, then, that the Non-Newtonian fluid studied here approximates the Newtonian, if the plastic viscosity is used in lieu of the Newtonian viscosity in expressing the Reynolds number of the clay suspension.
社団法人日本生物工学会の論文
1965-12-25