Experimental Investigation of Ligament Formation Dynamics of Thin Viscous Liquid Film at Spinning Disk Edge

Experimental Investigation of Ligament Formation Dynamics of Thin Viscous Liquid Film at Spinning Disk Edge
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旋转盘边缘粘性液膜韧带形成动力学的实验研究

DOI:
10.1021/acs.iecr.6b01428
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发表时间:
2016-08
影响因子:
4.2
通讯作者:
Yang Xinjun
Yang Xinjun
中科院分区:
工程技术3区
文献类型:
--
作者:
Wang Dongxiang;Ling Xiang;Peng Hao;Cui Zhenwei;Yang Xinjun

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实验研究了旋转圆盘边缘粘性液膜韧带的形成和破裂过程。建立了液滴韧带数、韧带末端直径和液滴平均直径的回归模型。尽管转杯式雾化器的速度滑移小于圆盘式雾化器的速度滑移,但转杯式雾化器的雾化性能并没有得到改善。随着转速的增加,韧带末端直径和液滴尺寸减小,而液体流量对韧带末端直径和液滴尺寸的影响较小。韧带在离心力场中断裂时,关节间的连接区域呈现哑铃状结构,哑铃状结构可从两端向中间收缩,进一步整合。尽管由于韧带拉伸,韧带断裂的毛细管波长约为韧带直径的3.15倍,但实际的主导模式是短波模式。
The ligament formation and break-up process of thin viscous liquid film at the spinning disk edge were performed experimentally. The regression models for ligament number, tail end diameter of ligament, and mean diameter of droplets were proposed. Despite the velocity slippage of rotary cup atomizers being smaller than that of the disk atomizer, it will not improve the atomizing characteristics. The tail end diameter of ligaments and the size of droplets decrease with increasing rotational speed, while liquid flow rate shows smaller influence on the tail end diameter and droplet sizes. For the break-up of a ligament in the centrifugal field, the connected region between joints presents as dumbbell structures, and the dumbbell structures may contract from both ends to the middle for further integration. Despite the capillary wavelength for the break-up of a ligament being about 3.15 times of the ligament diameters due to ligament stretching, the actual dominant mode is the short-wave mode.
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