天然橡胶干燥气流分布的均匀性研究

Study on airflow distribution uniformity of natural rubber drying gas

借助Fluent软件,建立了不同工况状态、不同胶层厚度和不同流道的天然橡胶干燥模型,模拟了气体的流动状况。根据胶层表面压差和中心面竖向速度的分布情况,分析了相应模型气流分布的均匀性。结果表明:矩形流道模型,胶层表面压差沿流向逐渐增大分布,导致了穿过橡胶层气流分布的不均匀,气流量越大、干燥阶段越往后,气流分布的不均匀性越明显;梯形流道模型,不同胶层厚度的流体分布规律基本一致,在斜面斜率最大时,气流均匀化效果较优;干燥状态一定时,组合模型两段斜面的合理设置,气流分布的均匀性进一步提高;相对整个干燥过程而言,梯形流道⑤模型气流分布的整体均匀化效果比斜面组合②模型的更好。

This paper established the different working states,different thickness and different channel of natural rubber drying models,and simulated the flow conditions of the gas using Fluent software.According to the surface pressure difference of the natural rubber and the vertical speed distribution of the center plane,the corresponding models of air distribution uniformity were analyzed.The results showed that in the rectangle runner model,the surface pressure difference along the flow direction increased gradually,resulting in an uneven distribution of the flow through the rubber layer.With greater gas flow and longer drying time,the air distribution uniformity became more obvious.In the trapezoidal runner model,the fluid distribution was basically consistent with different layer thickness,With the maximum slope gradient,the flow uniformity reached the best condition.At certain drying state,if the two paragraphs cants of combination model were placed reasonably,the airflow uniformity could be further improved.The overall airflow distribution uniformity was better in the trapezoidal model.