The isolated mixed region (IMR) is gradually formed during stirring and reduces the mixing efficiency. The unsteady-state formation process of the IMR was modeled and its formation mechanism was analyzed. The rotating frequency of the impeller was optimized using the chaos mathematical theory to improve the stirring efficiency without increasing the power consumption. The calculated results demonstrate that the IMR is a coherent structure, and its formation process is based on the free shear effect of the mixed layer. The chaotic stirring method can accelerate the momentum dissipation process by 37% by eliminating the IMR, and increase the speed by up to 31%. Therefore, chaotic mixing can eliminate the IMR in a shorter time and lower the power consumption.

中文翻译：

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机械搅拌隔离混合区的形成机理及混沌补强

孤立的混合区域（IMR）在搅拌过程中逐渐形成，并降低了混合效率。对IMR的非稳态形成过程进行了建模，并分析了其形成机理。使用混沌数学理论对叶轮的旋转频率进行了优化，以提高搅拌效率而又不增加功率消耗。计算结果表明，IMR是一种相干结构，其形成过程基于混合层的自由剪切效应。混沌搅拌法可消除IMR，从而使动量耗散过程加快了37％，速度提高了31％。因此，混沌混合可以在更短的时间内消除IMR并降低功耗。