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| Effect of turbulence generator diameter ratio on fluid viscosity in shear chamber |
| LIU Zailun1,2, WANG Hu1*, LU Weiqiang3,SU Danfeng1 |
| 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Engineering Institute of Wenzhou Pump & Value, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China; 3.College of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404000, China |
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Abstract To find out influences of turbulence generator diameter ratio on pulp viscosity in a shear chamber, a new design method was proposed for the turbulence generator. Five turbulence generators with different diameter ratios, namely 0.5, 0.6, 0.7, 0.8 and 0.9 were designed. Then the viscosity distribution in the shear chamber with these generators was analyzed in terms of viscosity mean and standard deviation based on CFD numerical simulations when the sanitary pulp with 12.5% consistency was used as pumped medium. It turned out that the whole value of fluid viscosity in the shear chamber decreased gradually as the diameter ratio raised from 0.5 to 0.9, and the viscosity distribution in the chamber was the most uniform when the diameter ratio was 0.7. In different axial cross-sections in the chamber, it was found that with increasing diameter ratio a phenomenon where the fluid with high viscosity was separated from the fluid with low viscosity occurred at the inlet to the chamber, and the fluid viscosity at the outlet to the chamber decreased gradually. In the same section, the fluid viscosity varied regularly in the radius direction, and there was a minimum viscosity at the tip of the turbulence generator. As the diameter ratio is increased, the minimum viscosity was lowered gradually, and its position moved along the radius increasing direction.
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Received: 27 June 2019
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