卧式搅拌槽内流体混合的与模拟研究-中国科技论文在线.pdfVIP

第3卷 第12期 2008 年 12 月 中国科技论文在线 Sciencepaper Online 911 卧式搅拌槽内流体混合的实验与模拟研究 王嘉骏，顾雪萍，冯连芳，曹松峰，胡国华 （化学工程国家重点实验室，浙江大学化工系，杭州 310027 ） 摘 要：对卧式单轴格子桨搅拌槽中的流体混合过程进行了实验和模拟研究；采用碘和硫代硫酸钠褪色法实验 考察了不同搅拌转速时的混合特性，由数码相机记录了混合过程的快照；采用计算流体力学方法对于混合时间 进行两步法模拟，先计算稳态流场，然后在此稳态流场的基础上采用加入浓度标量的方法计算示踪剂扩散情况。 混合过程的模拟结果与实验数据吻合良好。 关键词：化工传递过程；卧式反应器；计算流体力学；混合时间 中图分类号：TQ027.2 文献标识码：A 文章编号：1673－7180(2008)12 －0911 －4 Experimental study and CFD simulation of fluid mixing process in a horizontal stirred vessel WANG Jiajun ，GU Xueping ，FENG Lianfang ，CAO Songfeng ，HU Guohua (State Key Laboratory of Chemical Engineering, Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027,China) Abstract: The fluid mixing performance is investigated in a horizontal vessel with a single-axial lattice-blade impeller. The relation between mixing process and rotation speed are studied experimentally with depigmentation method of I and Na SO . The snapshots of dye diffusion have been recorded with digital camera. The two-step 2 2 3 method for the computational fluid dynamics (CFD) simulation of the mixing performance was adopted. The steady velocity field is simulated firstly, and then the diffusion of dye is simulated based on the transportation of user defined concentration scalar. The simulation data of mixing time are quite consistent with the experimental results. Key words: chemical engineering transport process ；horizontal reactor ；computational fluid dynamics ；mixing time 因地、因时而异，但是这种测量方法简单快捷，在操作 0 引 言 条件均固定时，仍能对搅拌器的混合性能优劣作一定信 20