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化工搅拌装置内的流体流动伴随着显著的传热过程,由于搅拌流动的复杂性以及温度的分布难以测量,采用试验法具有一定的局限性。利用计算流体力学(CFD)软件,采用标准k-ξ紊流模型,分析了非稳态非等温情况下,涡轮搅拌桨混合过程中搅拌槽中流体的三维紊流流场和温度场的分布。结果表明,大型搅拌反应装置采用搅拌桨通蒸汽加热方式,能够使搅拌槽温度分布更加均匀,热量扩散更加迅速。
Due to the complexity of the mixing flow and the difficulty of measuring the temperature distribution, the fluid flow in the chemical mixing device is accompanied by a significant heat transfer process. The experimental method has some limitations. Using CFD software and standard k-ξ turbulence model, the distribution of the three-dimensional turbulent flow field and temperature field in the stirred tank during turbulent mixing impeller is analyzed under non-steady state and non-isothermal condition. The results show that the large-scale stirring reaction device adopts the impeller steaming heating method, which can make the temperature distribution in the stirred tank more uniform and the heat spread more rapidly.