Abstract Secondary breakup is a common phenomenon in nature, as well as in industrial applications. The secondary breakup of Carboxymethyl cellulose (CMC) droplets in a continuous air jet flow is investigated experimentally by a high-speed digital camera. Through varying the Weber number and the Ohnesorge number in the experiment, the breakup morphology, deformation stage, and breakup regime map are discussed in detail. The results show that the breakup modes of CMC droplet are consistent with that of water droplets in the Weber number range from 8 to 50 considered in the experiment. The number of nodes generated at the toroidal rim of the CMC droplet is verified to be the same as that of water droplet, following “the combined R-T/aerodynamic drag” mechanism. However, the breakup results of CMC droplets and water droplets are significantly different. The liquid ring and nodes produced by CMC droplets cannot disintegrate completely under the action of aerodynamic forces. In different breakup modes, the effective Ohnesorge number of CMC droplets has different influences on the cross stream diameter time-wise evolution and maximum deformation. The corresponding correlations for the above characteristics are developed in this paper. Finally, the breakup regime map of CMC droplets is produced by the Weber number and the effective Ohnesorge number.

中文翻译：

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羧甲基纤维素液滴二次破碎的实验研究

摘要 二次破碎是自然界和工业应用中的普遍现象。通过高速数码相机实验研究了连续空气射流中羧甲基纤维素 (CMC) 液滴的二次破碎。通过改变实验中的韦伯数和奥内索格数，详细讨论了破碎形态、变形阶段和破碎状态图。结果表明，CMC液滴的破碎方式与实验中考虑的韦伯数范围为8~50的水滴的破碎方式一致。遵循“RT/气动阻力组合”机制，CMC 液滴环形边缘产生的节点数经验证与水滴相同。然而，CMC液滴和水滴的破碎结果有显着差异。CMC液滴产生的液环和节点在空气动力的作用下不能完全解体。在不同的破碎模式下，CMC 液滴的有效 Ohnesorge 数对横流直径随时间的演变和最大变形有不同的影响。本文开发了上述特征的相应相关性。最后，CMC 液滴的破碎机制图由韦伯数和有效 Ohnesorge 数产生。CMC 液滴的有效 Ohnesorge 数对横向流直径随时间的演变和最大变形有不同的影响。本文开发了上述特征的相应相关性。最后，CMC 液滴的破碎机制图由韦伯数和有效 Ohnesorge 数产生。CMC 液滴的有效 Ohnesorge 数对横向流直径随时间的演变和最大变形有不同的影响。本文开发了上述特征的相应相关性。最后，CMC 液滴的破碎机制图由韦伯数和有效 Ohnesorge 数产生。