旋转多通道烘缸传热特性的数值模拟分析

Numerical Simulation on Heat Transfer of rotating Multi-Channel Cylinder Dryer

关键词:  多通道烘缸，冷凝传热，旋转速度，数值模拟

Key Words:Multi-channel cylinder dryer, condensation heat transfer, rotational speed, numerically simulate

摘要:多通道烘缸可有效排除烘缸通道内的冷凝水，从而降低能耗，提高干燥效率。但是多通道烘缸旋转速度较高，很难通过实验方式对烘缸的冷凝传热过程进行测量。因此，应用Fluent软件中的VOF两相流模型对多通道烘缸中蒸汽冷凝传热特性进行了数值模拟。以多通道烘缸的旋转速度作为变量，得出了冷凝液含量、冷凝传热系数及流动压降的变化规律。结果表明，随烘缸转速升高，通道内冷凝液量增多，冷凝传热系数及压降也增大，但是增加幅度越来越小。

Abstract:Condensation heat transfer in multi-channel cylinder dryer is numerically simulated with Fluent software using VOF two-phase flow model. The rotational speed is chosen as variable. The condensate volume, condensation heat transfer coefficient and pressure drop are obtained. The simulation result shows that the condensate volume, condensation heat transfer coefficient and pressure drop are increased with the increasing of the rotational speed, but the increase rate tends to decrease.