固体粒子の水力輸送に関する研究 (第3報)

摩擦係数の測定

抄録

Coefficient of friction between pipe wall and solid material when mixture of solid material and water flows through a pipe, was measured under the condition of hydraulic transporting solid material.
When frictional force (F=μ_sW_t) occurs between particle group and pipe wall, reaction force (Ts) of the same magnitude with frictional force acts on the pipe.
F=-T_s=μ_sW_t
The authors measured reaction force and calculated coefficient of friction (μ_s).
Results obtained are summarized as follows.
(1) According as mean velocity of mixture increases, coefficient of friction decleases rapidly.
(2) Coefficient of friction (μ_s) was expressed as
μ_s=μ_s0 (ν_m/ν_m0)-n
where vm=mean velocity of mixture (m/s)
μ_S0, n=constants