Simulation analysis of extrusion flow field and temperature field of rice noodles extruder
Aiming at the problem that the flow field and temperature field of rice flour extrusion in the process of rice flour extrusion of single screw extruder are complex and difficult to detect,combined with the characteristics of single screw extruder and rice flour,the numerical simulation was carried out by Fluent software.A three-dimensional model including variable pitch screw and sleeve was constructed.Combined with the key process parameters such as screw speed,feed rate and barrel contact surface temperature in actual processing,the unsteady flow simulation was carried out by sliding mesh model,and the simulation results were verified by experiments.The simulation results show that the maximum pressure difference between the inlet and outlet of the flow field can reach 5.58 MPa,and the transport speed along the z-axis ranges from 0.374 m/s to 0.782 m/s,and decreases slowly.When the screw speed increases from 50 rad/s to 70 rad/s,the viscous dissipation power increases from 16 217.00 W to 30 974.96 W,and the cross-section temperature dispersion coefficient increases from 3.48%to 4.29%.When the frequency of the feeding motor increases from 10 Hz to 25 Hz,the viscous dissipation power increases from 20 511.41 W to 23 066.87 W,and the cross-section temperature dispersion coefficient decreases from 7.80%to 3.65%.The wall temperature increases from 353.15 K to 373.15 K,the viscous dissipation power decreases from 23 100.72 W to 23 032.85 W,and the cross-section temperature dispersion coefficient increases from 3.27%to 4.19%.The verification test shows that the influence of screw speed,feed rate and wall temperature on the temperature rise speed is consistent with the simulation results.This study provides a theoretical basis for the development of rice flour extrusion machine control system and the precise control of rice flour ripening process temperature and the optimization of process parameters.
extrusion of rice noodlesflow field simulationtemperature distributionsliding mesh model
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