(1.School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013,China; 2.Department of Information and Engineering, Changzhou Radio and TV University, Changzhou, Jiangsu 213001,China)
According to the characteristic of concrete，which is of typical non Newtonian Bingham fluid, the constitutive equations and fluid mechanical model were set up. Based on finite element method and k-ε model, the three dimensional flow field of readymixed concrete in mixing tumblingbox was calculated using Fluent software. The numerical simulation for streamline and axial output speed of flow field were obtained at the condition of mixing blade spiral angle of 73°. The actual concrete mixing situation in tumbling box was relatively truly reflected. Contrasted with other mixing blades with different spiral angles of 66° and 80°, the mixing performance and output speed with spiral angle of 73° was superior to other mixing blades, and it satisfied the requirements of homogeneous materials, continuous feeding and low power consumption of mixing tumblingbox for mixing carriers. In the meantime, some comparison testing was done and the correctness of simulation was proved. The numerical simulation for the concrete of nonNewtonian Bingham fluid in mixing tumbling box shows that k-ε model based CFD method can be used for analyzing the mixing process of concrete in mixing tumblingbox.
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