用毛细管粘度计测定易沉降固液悬浮体的粘度

测定固液悬浮体粘度时,流体进入毛细管前应有良好的搅拌,但它将引起入口端额外的端效应.本文引入了一个惯性校正项,可以有效地解决搅拌下毛细管粘度计的标定及固液悬浮体粘度的测量问题.根据上述标定结果用毛细管粘度计对氨性溶液与镍红土矿配成的矿浆进行了粘度测定.实验表明,固体粒子体积浓度较低时,该流体近似牛顿流体,其粘度与体积浓度的关系可用Vand方程式表示,即μ/μ_0=exp(bc_V).

Measurement of Viscosity of Settling Solid-Liquid Suspensions by Capillary Viscometer

The capillary viscometer is often used for viscosity measurement. However,in measuring of viscosity of settling suspensions, the suspensions must he agitated rather vigorously before entering the capillary to get a uniform concentration of slurry. The viscosity thus measured is always in error. A correction term has been introduced in this work to account for the velocity head due to agitation.Viscosities of ammonia solutions and slurries of laterite ore and ammonia solution were determined satisfactorily with correction term mentioned above. The effect of temperature and solid concentration on viscosity was studied. Results indicate that the laterite ore slurry with volume concentration of solid particles less than 8.45% can be considered as Newtonian fluid. The relationship between its viscocity and volume concentration can be expressed by Vand equation: μ/μ0=exp(bcv).