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| Numerical simulation of cylinder orientation through a rotating straight expansion duct |
| Zhang Qihua1, Li Yuexian2, Lin Jianzhong1,3 |
| (1.Institute of Fluid Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.Hangzhou Zhenxing Limited Company of Industrial Pump, Hangzhou, Zhejiang 311234, China; 3.College of Metrology ＆ Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China) |
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Abstract To obtain the evolutions of cylinder trajectory and orientation,the cylinder suspension flowing through a rotating straight expansion duct was simulated numerically.The Laplace equation was used to generate the numerical grids of the duct,and the FVM was used to solve the flow field.Then the Runge-Kutta method was adopted to integrate the Jeffery equation along the trajectory to obtain the cylinder orientation.The probability distribution function was solved to get the steady cylinder orientation distribution.The results show that the fluid velocity at inlet and inlet position of cylinders located have significant effects, and rotation velocity of duct and initial cylinder orientation have insignificant effects on the orientation distribution of cylinders.The orientation distribution of cylinders is not sensitive to the variation of cylinder aspect ratio when the aspect ratio is larger than 5.For the cylinders with aspect ratio less than 5, the smaller the aspect ratio, the faster cylinders rotate, and more frequently cylinders swing around the flow direction. Cylinders generally orient along the flow direction, which is more obvious in the region near the wall. The conclusion is helpful to the investigation on the pumping process of suspension containing cylinders.
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Received: 28 March 2010
Published: 30 September 2010
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