The present experimental study extends the Ohnesorge nomogram of liquid jet breakup regimes to viscoelastic liquids and presents a model for the jet breakup length. The experiments are carried out with water and with aqueous solutions of two different flexible polymers. The experiments rely on the visualization of the jets for identifying the breakup mechanism and for measuring the breakup length. Both the breakup mechanisms and the breakup lengths of the jets are modeled in a form allowing both Newtonian and non-Newtonian, viscoelastic liquids to be included. It is shown that, for the representation of the two classes of liquids, the dynamic viscosity to be involved must be an elongational rather than a shear viscosity. In the breakup of viscoelastic liquid jets, the elongational viscosity is a transient quantity. For breakup modeling, the terminal elongational viscosity is identified as relevant. Both the breakup mechanisms and the breakup lengths are well represented by the elongational Reynolds and Ohnesorge numbers.

中文翻译：

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液体喷气分解系统的通用OHENSORGE常模

本实验研究将液体射流破裂状态的Ohnesorge诺模图扩展到粘弹性液体，并提出了射流破裂长度的模型。实验是用水和两种不同柔性聚合物的水溶液进行的。实验依靠喷嘴的可视化来识别破碎机理和测量破碎长度。射流的破裂机理和破裂长度均以允许同时包括牛顿和非牛顿粘弹性液体的形式建模。结果表明，对于两种液体的表示，所涉及的动态粘度必须是伸长粘度而不是剪切粘度。在粘弹性液体射流的破裂中，伸长粘度是瞬时量。对于分手建模，最终伸长粘度被认为是相关的。断裂机理和断裂长度都由伸长的雷诺数和奥尼索格数很好地表示。