采用旋转粘度计测定了不同含固率、温度条件下新鲜猪粪的流变曲线,并对含固率、温度对猪粪流变特性的影响进行了分析。结果表明:猪粪为假塑性流体且符合幂率方程。表观粘度随含固率的增大呈现增大趋势,但温度对其影响不大;表观粘度与含固率曲线存在临界点,可以作为非牛顿流体(猪粪)近似视为牛顿流体的标准;表观粘度与剪切速率曲线也存在一个临界D值,提出搅拌死区可以从剪切速度角度来定义。同时对温度影响猪粪表观粘度的机理进行了讨论;最后对表观粘度与含固率、剪切速率的关系进行了多元非线性回归分析,建立了表观粘度樽剥日圳合特集徂辑为涉殛非牛市丽'7斋体f猪娄、的T芦诗计和优化根供了甬执形式的物忡参麴姜系式.
Rheological curves of pig manure with different solid holdup and temperatures were measured by a rotational viscometer. The effects of solid holdup and temperatures on the rheological behaviors were studied. The results indicated that pig manure behaved like pseudoplastic fluid and followed the power law model. The apparent viscosity showed an "upward growth" trend with the increase of solid holdup, but the temperature had little influence on it. There were some critical points on viscosity and solid curves, and they could be used as the standard of non-Newtonian fluid (pig manure) regarded as Newtonian approximately. There were also some critical D values on viscosity and shear rate curves, proposing that they could be used as definition of dead zone. The mechanism for temperature affecting apparent viscosity was discussed. Finally, the relationship between analyzed apparent viscosity and solid holdup and shear rate with the help of multiple nonlinear regression were analyzed, and a mathematical model was established and fittted well with experimental results, which provided the relationship of physical parameters in the functional form for process design and optimization involving non-Newtonian fluid (pig manure)