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In the numer-ical simulation, the same amount of scalar was added at thecorresponding position with the injection velocity equalsexactly to the local fluid velocity.What’s more, the transientprocess in the stirred tank was captured at a rate of 50frames per second. The time between two successive record-ings was 0.02 s, which is 1% of the total injection time. In thenumerical simulation, the concentration of the scalar wassampled at an interval of 0.01 s.5. ConclusionsThe mixing process in an unbaffled tank stirred by a four-pitched-blade turbin was numerically simulated by using theDES model. The impeller was considered with the details of theblade geometry and the SM method was used for the simulationof the impeller rotation. The mixing pattern and mixing time werepredicted using the commercial CFD software Fluent 6.3. Thenumerical predictions were compared with the experimental datathat are available in the literature. Results show that mixing timein the eccentric stirred tank depends on the position of themeasur-ing point. In addition, mixing time decreases with the increase ofeccentricity. Comparisons of the DES and PLIF data show that thenumerically predicted mixing time compares well with the exper-imental results, with an average overprediction of within 20%. Thegood agreements indicate that DES model coupled with the SMmethod can be used to simulate the mixing processes in stirredtanks accurately.AcknowledgementsFinancial support from Independent Innovation Foundation ofShandong University (No. 2010GN052) and Shandong scientificand technological project (No. 2009GG10007019) are gratefullyacknowledged.
搅拌釜内混合液体的分离涡模拟
摘要：在目前的工作中，分离涡模拟（DES）模型被用来研究搅拌釜中搅动同心和偏心位于四个金字叶片的涡轮搅拌情况下液体相混合的过程，。使用滑动网格（SM）方法模拟叶轮旋转。基于标量浓度随时间的变化下，混合模式和混合时间与平面激光诱导荧光（PLIF）的实验数据进行分析和比较。结果显示，DES模型和SM相结合的方法可以描述瞬态搅拌釜内的混合状态，并能提供详细的时空演化的标量浓度。在同心及偏心搅拌配置之下，记录几个地点内的网域显示的不同的混合模式的浓度，论文网在偏心作用下不同的监测点混合时间的差异是很小的。总体而言，平均在20％以内，该预测的混合时间与PLIF技术所获得的结果比较吻合。该结果显示，DES是一个研究非稳态混合搅拌釜内混合特征的可靠工具。
关键词：搅拌釜，偏心搅拌，混合，计算流体动力学，分离涡模拟，滑动网