差動式回転粘度計の試作 : レオロジー一般
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概要
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Recently we have designed a new type of rotational viscometer to study the non-Newtonian flow of the dilute polymer solutions. With our viscometer we can obtain the relative viscosity without measuring viscosities of solvent and solution separately. The viscometer is constructed with two sets of concentric cylinders of the same size, one of which is placed on the other on the same vertical axis. The lower inner cylinder and the upper outer one are connected with a thin rod. This connection part is supported and slightly floated by an air bearing, and can be rotated freely. The upper inner cylinder is fixed to the support. The lower outer cylinder is rotated at a constant speed by a synchronous motor through precision gears. The gap in the lower cylinders is filled with solution, and the gap in the upper owing to the viscosity of the solution, and receives braking torque at the upper outer cylinder owing to the viscosity of the solvents. Then, the rotational speed of the floating part is determined by the viscosity difference between the solution and the solvent. Therefore, if no friction exists in the air bearing, the relative viscosity can be formulated as follows : η_γ=η/η_0=ω/<ω_0-ω.> η: viscosity of the solution, η_0 : viscosity of the solvent, ω : angular velocity of the floating part, ω_0 : angular velocity of the lower outer cylinder. But actually, a small friction is inevitable is inevitable in the air bearing owing to the viscosity of air so that correction must be applied to the preceding formula.
- 社団法人日本材料学会の論文
- 1960-04-15
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