Most Suitable Blade Inclination Angle for Multiphase Flow in Soybean Milk Machine

The blade inclination angle of soybean milk machine is a key geometric parameter for efficient crushing. For the purpose of obtaining optimal design, the gas-liquid two-phase flow field inside a soybean milk machine is simulated. The gas holdup from simulation is in agreement with the experiment. The simulation result shows that the lower blade A has a great influence on the internal flow field of soybean milk machine, while the upper blade B has a small influence on the flow field. As the angle⎹ α𝐴⎹  increases, the peak value of radial velocity decreases and moves to the interior of the cavity, so does the total pressure. When αA changes from -24° to -26°, the velocity vector at the bottom of the cavity changes from the connected state to the separated state, and the pressure difference between the up and the bottom surface of blade A becomes large. When αA = -24°, the flow field has the strongest turbulent kinetic energy and dissipation. When αB =28°, the pressure difference reaches the maximum. In summary, the best inclination angles are α𝐴𝑜𝑝𝑡 =-24° ∼ -26° and α𝐵𝑜𝑝𝑡 =28°, respectively.