This study is in line with two previous studies by the same authors on gas injection in yield stress fluids. Gas is injected toward the bottom wall of a prismatic tank containing a yield stress fluid. When rising toward the free surface, trains of bubbles generate fluid recirculation in the tank. Two experimental colorimetric methods are introduced and validated in order to quantify the recirculation liquid flow rate as well as the time evolution of the extent and shape of the mixed volume. The influences of the injection flow rate, fluid rheology, and reactor size have been quantified. Correlations based on the characteristic nondimensional numbers of the flow have been developed to predict the downward liquid flow rate as well as the mixed volume. A model for estimating the mixing time is also developed and compared to experimental results.

中文翻译：

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通过注气搅拌屈服应力流体

这项研究与同一作者之前关于屈服应力流体中注气的两项研究一致。气体被注入到含有屈服应力流体的棱柱形罐的底壁。当向自由表面上升时，一串气泡会在罐中产生流体再循环。为了量化再循环液体流速以及混合体积的范围和形状的时间演变，介绍并验证了两种实验比色法。注入流速、流体流变性和反应器尺寸的影响已被量化。已经开发了基于流动特征无量纲数的相关性来预测向下的液体流速以及混合体积。还开发了一种用于估计混合时间的模型，并与实验结果进行了比较。