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Comparative PIV and LDA studies of Newtonian and non-Newtonian flows in an agitated tank

机译：搅拌罐中牛顿流和非牛顿流的PIV和LDA比较研究

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摘要

The paper presents results of an experimental study of the fluid velocity field in a stirred tank equipped with a Prochem Maxflo T (PMT) type impeller which was rotating at a constant frequency of N = 4.1 or 8.2 s−1 inducing transitional (Re = 499 or 1307) or turbulent (Re = 2.43 × 104) flow of the fluid. The experiments were performed for a Newtonian fluid (water) and a non-Newtonian fluid (0.2 wt% aqueous solution of carboxymethyl cellulose, CMC) exhibiting mild viscoelastic properties. Measurements were carried out using laser light scattering on tracer particles which follow the flow (2-D PIV). For both the water and the CMC solution one primary and two secondary circulation loops were observed within the fluid volume; however, the secondary loops were characterized by much lower intensity. The applied PMT-type impeller produced in the Newtonian fluid an axial primary flow, whilst in the non-Newtonian fluid the flow was more radial. The results obtained in the form of the local mean velocity components were in satisfactory agreement with the literature data from LDA. Distribution of the shear rate in the studied system was also analyzed. For the non-Newtonian fluid an area was computed where the elastic force dominates over the viscous one. The area was nearly matching the region occupied by the primary circulation loop.
机译：本文介绍了对装有Prochem Maxflo T（PMT）型叶轮的搅拌槽中的流体速度场进行实验研究的结果，该叶轮以N = 4.1或8.2s -1 诱导流体的过渡流动（Re = 499或1307）或湍流（Re = 2.43×10 4 ）。实验是对牛顿流体（水）和非牛顿流体（羧甲基纤维素的0.2 wt％水溶液，CMC）表现出适度的粘弹性进行的。使用激光散射对跟随流动的示踪颗粒进行测量（2-D PIV）。对于水和CMC溶液，在流体体积内均观察到一个主要循环和两个次要循环。但是，次级回路的特点是强度低得多。所应用的PMT型叶轮在牛顿流体中产生轴向主流，而在非牛顿流体中产生更大的径向流。以局部平均速度分量的形式获得的结果与LDA的文献数据令人满意。还分析了所研究系统中的剪切速率分布。对于非牛顿流体，计算了一个区域，在该区域中，弹力在粘性流体上占主导地位。该区域几乎与一次循环回路所占据的区域匹配。

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