刮壁浆在槽式釜的传热研究

Heat Transfer in Vessel with Scraped Surface Agitator

针对结刮壁搅拌槽壁面的传热提出渗透－对流模型。运用在搅拌浆上安装热电偶的测温方法，考察了刮壁搅拌槽中的温度分布情况，实验结果支持了渗透－对流模型。当Ｒｅ＞１００，Ｒｅ·Ｐｒ＞１０６时，刮壁残余层对壁面传热有明显影响，随着Ｒｅ的进一步提高，刮壁槽壁面的传热系数增加缓慢，关联得到Ｒｅ＜１００，８０００＜Ｐｒ＜１８０００时刮壁槽壁面传热系数的经验关联式。

An penetration-convection model was presented for the heat transfer of the vessel with the scraped surface agitator in this paper.The temperature distribution in the vessel was investigated by the thermocouples fixed on the shaft of the agitator.The model was supported by the experimental results.As Re>100,Re·Pr>10 6,the residual film had a great influence on the heat transfer of the vessel.The heat transfer coefficient had a little increase with increase of Re.An empirical correlation of the heat transfer coefficient on the scraped vessel wall has been obtained for Re<100,8000<Pr<18000.