Experimental tests for characterizing bubble breakage dynamics in different locations of a stirred tank with a 6-bladed impeller were carried out for a range of impeller Reynolds number (Re) using water as a continuous phase. The dynamic behavior of the bubble from the injection point until arriving at the impeller region was studied by using a high speed imaging method. The deformation behavior, local breakage probability, and the local number of daughter bubbles produced from the injection point until crossing the impeller region were quantified for the whole range of power input. The dominant breakage mechanisms at different locations in the stirred tank were identified and discussed. The results revealed that during the bubble’s motion in the turbulent field, it experiences different scales of deformation depending on the location of the bubble. Highly deformed shapes were observed in the injection and impeller regions due to the bubble’s interaction with turbulent eddies. Three distinct regions between the injection position and the impeller region were observed in which different breakage mechanisms were found to govern the breakage behavior including turbulent fluctuation, shear forces, and bubble collision with the blade. High breakage probability was observed in front of the blade’s tip, with about 90% occurring within a distance of 0.35Ri from the blade’s tip (Ri is the impeller radius). In the impeller region, around 20% of the breakages occurred above the impeller close to the blade’s top, while the breakage percentage below the impeller was very small (2% as a maximum). The breakage probability and the number of daughter bubbles increased with increasing Re with a dependence of 1.3.

使用水作为连续相，针对一定范围的叶轮雷诺数（Re），进行了表征带有6叶片叶轮的搅拌釜中不同位置的气泡破裂动力学特性的实验测试。通过使用高速成像方法研究了从注入点到到达叶轮区域的气泡的动态行为。对于输入功率的整个范围，对从注入点直到越过叶轮区域为止的变形行为，局部破损概率和子气泡的局部数量进行了量化。确定并讨论了搅拌釜中不同位置的主要破坏机理。结果表明，在气泡在湍流场中运动期间，它会根据气泡的位置经历不同程度的变形。由于气泡与涡流的相互作用，在注入区和叶轮区观察到了高度变形的形状。观察到在喷射位置和叶轮区域之间的三个不同区域，在其中发现了不同的破裂机制来控制破裂行为，包括湍流波动，剪切力和与叶片的气泡碰撞。在叶片尖端的前面观察到了很高的破损概率，其中约90％发生在距叶片尖端0.35Ri的距离内（Ri是叶轮半径）。在叶轮区域，大约20％的破损发生在靠近叶片顶部的叶轮上方，而叶轮下方的破损百分数很小（最大值为2％）。