Abstract：3D flow field of mixing process in an agitator tank was simulated by using Multiple Reference Frame (MRF) and standard k-εmodel, and the liquid flow status in the mixing tank was analyzed. In order to verify that the impellers can mix the liquid effectively, velocity distribution of vertical surface and horizontal surface were studied respectively. Meanwhile, PIV was used to study and discuss the real flow condition in the agitator tank. The experimental data of velocity distribution on agitator tank liquid level, impeller inflow area, impeller discharge area and tank bottom area are contrasted with the simulation results. It is discovered that the axial speed increasing trend obtained from numerical simulation is quite agreement with that of the experiment, while the point of highest speed has some difference: on tank bottom area the two results are consistent, and the highest speed of simulation on impeller discharge and impeller inflow region is lower 12.8%and 14.2% than that of experiment respectively, and on tank liquid level the two results are quite different. So the forecast function of the numerical simulation for experimental study was validated. This provides some useful reference for type election and design of agitator.
王春林, 吕亚云, 史亚婷, 丁 剑, 李长军. 桨叶式搅拌槽内部流场数值模拟及PIV试验[J]. 排灌机械工程学报, 2010, 28(4): 335-339.
Wang Chunlin, Lü Yayun, Shi Yating, Ding Jian, Li Changjun. Numerical simulation and PIV test of internal flow field in paddle stirred tank. Journal of Drainage and Irrigation Machinery Engin, 2010, 28(4): 335-339.
[1]Zadghaffari R,Moghaddas J S,Revstedt J.A mixing study in a double-rushton stirred tank[J].Computers and Chemical Engineering,2009,33(7):1240-1246.[2]王春林,马庆勇,李婷婷,等.搅拌浆液池固-液两相流搅拌的数值模拟[J].排灌机械,2007,25(6):38-41.Wang Chunlin,Ma Qingyong,Li Tingting,et al.Numerical simulation of solid-liquid two-phase flow in slurry pond[J].Drainage and Irrigation Machinery,2007,25(6):38-41.(in Chinese)[3]孙会,潘家祯,崔宁,等.带有内外组合桨的搅拌设备内流场的数值研究[J].高校化学工程学报,2005,19(3):315-319.Sun Hui,Pan Jiazhen,Cui Ning,et al.Numerical investigation of flow fields in stirred vessel with combined inner and outer agitators[J].J Chem Eng of Chinese Univ,2005,19(3):315-319.(in Chinese)[4]柴胜凯,罗兴锜,廖伟丽.轴流泵叶轮内部三维流动分析[J].排灌机械,2004,22(1):16-19.Chai Shengkai,Luo Xingqi,Liao Weili.Three-dimensional flow investigation of axial pump impeller[J].Drainage and Irrigation Machinery,2004,22(1):16-19.(in Chinese)[5]杨小林,严敬.PIV测速原理与应用[J].西华大学学报:自然科学版,2005,24(1):19-20,36.Yang Xiaolin,Yan Jing.Principles for the measurement and image processing using PIV[J].Journal of Xihua University:Natural Science,2005,24(1):19-20,36.(in Chinese)[6]Ankamma R D,Sivashanmugam P.Experimental and CFD simulation studies on power consumption in mixing using energy saving turbine agitator[J].Journal of Industrial and Engineering Chemistry,2010,16(1):157-161.[7]Li Mingzhong,White G,Wilkinson D,et al.Scale up study of retreat curve impeller stirred tanks using LDA measurements and CFD simulation[J].Chemical Engineering Journal,2005,108(1/2):81-90.[8]Sun Haiyan,Mao Zaisha,Yu Chengzhi.Experimental and numerical study of gas hold-up in surface aerated stirred tanks[J].Chemical Engineering Science,2006,61(12):4098-4110.
