二,三のレオメータによるCasson の式に従う物質のパラメータの決定法

概要

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It is shown how to determine parameters of a material obeying Casson's equation by some rheometers. Casson has proposed an equation for the flow of varnishes relating to the shear stress F to the rate of shear D. This relation has the form F^<1/2>=k_0+k_1D^<1/2>, k_0 and k_1 being constants depending on the properties of suspensions. This equation is generally called Casson's equation. We have determined the parameters k_0 and k_1, that is, the viscosity η corresponding to k_1 and the yield value τ_f corresponding to k_0, by a rotating coaxial cylinder viscometer and a cone and plate viscometer. In the case of a rotating coaxial cylinder viscometer, η and τ_f are determined from the relationship between the torque M and the angular velocity Ω as follows: η=(1/a^2-1/b^2)(4πh tan^2 θ) τ_f=(1/a+1/b)^2 M_0/8πh In the case of a cone plate viscometer, there is a following relationship between the torque M on the plate and the angular velocity Ω for a non-Newtonian liquid [numerical formula] [numerical formula] Making use of this relation, we can get η and τ_f as follows: [numerical formula] Further we have tried to find the flow curve f(τ)=γ^^. from the known relationship between Ω and M. the flow curve is approximately given by [numerical formula]
社団法人日本材料学会の論文
1967-07-15