The cavern characteristics of xanthan gum solutions stirred by impellers of a perturbed six‐bent‐bladed turbine (6PBT) were investigated numerically using computational fluid dynamics (CFD) with laminar flow model. The apparent viscosity method was proposed to determine the boundary of the cavern. The cavern sizes predicted by apparent viscosity were in good agreement with the calculated results, and this method was not influenced by speed and impeller configuration. However, the predicted results of the cavern by the traditional speed method usually displayed a great deviation, especially at high speed. Therefore, it is feasible to determine the cavern boundary with the apparent viscosity, i.e., 0.25 times the yield viscosity of a pseudoplastic fluid, as the unified standard.

中文翻译：

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基于表观粘度法的拟塑性流体洞穴边界测定

利用层流模型和计算流体动力学（CFD），对扰动的六弯叶涡轮（6PBT）叶轮搅拌的黄原胶溶液的洞穴特性进行了数值研究。提出了表观粘度法来确定洞穴的边界。通过表观粘度预测的洞穴尺寸与计算结果非常吻合，并且该方法不受速度和叶轮配置的影响。然而，传统速度方法对洞穴的预测结果通常显示出很大的偏差，特别是在高速情况下。因此，以表观粘度即假塑性流体的屈服粘度的0.25倍来确定洞穴边界是统一的标准是可行的。