1. Yield Stress Measurement of Dense Pastes with Pipe Transport and Vane
- Author
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Zhang Ningxiao, Qu Yuanyuan, Wu Miao, Hao Xuedi, Lyu Fuyan, and Gao Jie
- Subjects
Materials science ,Yield (engineering) ,Polymers and Plastics ,Rheometer ,Extrapolation ,02 engineering and technology ,Flow stress ,021001 nanoscience & nanotechnology ,Surfaces, Coatings and Films ,Shear rate ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Rheology ,Shear stress ,Physical and Theoretical Chemistry ,Composite material ,0210 nano-technology ,Slipping - Abstract
Yield stress is a key rheological parameter of dense paste. Considering practical utility and to estimate the possible slipping flow, yield stress measurements were carried out using the curve extrapolation method and vane method with rheometer in both controlled shear stress (CSS) and controlled shear rate (CSR) model. All measured yield stresses show to increase exponentially with concentration in different scale. The vane method yield stresses are both higher than the extrapolation curve yield stress. For the coal slurry used in this paper, the extrapolation curve yield stress is lower by 17–30% than the dynamic yield stress that obtained under test model CSR. It indicates that wall slip exists in pipeline transportation; meanwhile wall slip can reduce transportation resistance of dense paste to some extent.
- Published
- 2015