辐射状内流道干燥圆盘温度场仿真与试验研究  

Simulation and experiment on temperature field of dial dryer with radicalized internal flow passages

作　　者：张亮[1] 马宁[1] 刘晶[1] 张哲[1] 孙小鹏[1] 

机构地区：[1]西安近代化学研究所,陕西西安710065

出　　处：《化学工程》2015年第12期16-20,共5页Chemical Engineering(China)

摘　　要：针对带有辐射状内流道挡板水域腔体的干燥圆盘,描述了该类型干燥圆盘系统的物理模型;针对辐射状挡板特点,构建了计算流体动力学的流动与换热数学模型,包括控制方程组与定解条件;对于水域腔体不同进水流速与进水温度,模拟仿真计算了流域内的温度场分布,得到了不同操作条件下干燥圆盘换热效果的强弱规律;进行干燥试验,通过非接触测温的手段对水域腔体表面径向与周向特殊点温度值进行测量,并与相对应坐标点的仿真离散数据进行对比分析。由结果可知:当进水温度一定时,带有辐射状内流道挡板的干燥圆盘存在最优进口流速,其值等于流速范围内的中位数;当进水流速一定时,理论上进口温度越高越有利于干燥过程,但考虑待干燥物料的热敏感性与节能要求,进口温度存在最大值;模拟仿真数据与实验数据具有一致性,从而证明了仿真结果与所得规律的正确性。The physical model of dial dryer was described, which had a water cavity with radicalized internal flow passages. CFD Mathematical model of flow and heat transfer was established according to radicalized baffles, including governing equations and definite conditions. The distribution of temperature field in flow region was simulated and calculated with different inlet velocity and temperature, which was resulted in strong-and-weak law of heat transfer in different region of dial dryer. Drying experiments were constructed in order to measure the temperature through non-contact mode in special points which distribute in radial and circular direction of surface of water cavity, and the experiments data were contrasted with simulation results in the same coordinate respectively. The results indicate that the optimal inlet velocity is subsistent in dry process of dial dryer with radicalized baffles when inlet temperature is constant, and the optimal value equals to the median in range of inlet velocities. The higher inlet temperature is more beneficial to dry process theoretically when inlet velocity is invariable, but in fact the maximal inlet temperature is exist when thermal sensitivity of dried materials and energy saving requirements are considered. The data of simulation and experiment are of high consistency, which demonstrate the correctness of simulative results and rules above.

关 键 词：干燥圆盘 水域腔体 计算流体动力学 辐射状内流道 仿真计算 温度分布 

分 类 号：TQ021.1[化学工程]