转盘边缘黏性薄液膜不同破碎模式临界转变特性

doi:10.11949/j.issn.0438-1157.20170233

化工学报 ›› 2017, Vol. 68 ›› Issue (11): 4121-4128.DOI: 10.11949/j.issn.0438-1157.20170233

转盘边缘黏性薄液膜不同破碎模式临界转变特性

王东祥^1,2, 凌祥², 彭浩², 崔政伟¹, 杨新俊^1,2

1 江南大学机械工程学院, 江苏省食品先进制造装备技术重点实验室, 江苏无锡 214122;
2 南京工业大学江苏省过程强化与新能源装备技术重点实验室, 江苏南京 211800

收稿日期:2017-03-10 修回日期:2017-07-26 出版日期:2017-11-05 发布日期:2017-11-05
通讯作者: 王东祥
基金资助:
国家自然科学基金项目（51606086，51406078）。

Critical breakup transition characteristics of thin viscose liquid film at spinning disk rim

WANG Dongxiang^1,2, LING Xiang², PENG Hao², CUI Zhengwei¹, YANG Xinjun^1,2

1 Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology, School of Mechanical Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China;
2 Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, Nanjing Tech University, Nanjing 211800, Jiangsu, China

Received:2017-03-10 Revised:2017-07-26 Online:2017-11-05 Published:2017-11-05
Supported by:
supported by the National Natural Science Foundation of China (51606086, 51406078).

摘要/Abstract

摘要：

液膜在离心粒化器边缘的破碎模式直接决定了雾化后的液滴形态和尺寸分布，是影响物料品质的关键因素。针对转盘粒化器，提出临界转变系数表征液膜由膜状向纤维状破碎的转变条件，并拓展至其他破碎模式，建立了滴状向纤维状、完全纤维状及纤维状向膜状破碎转变的临界关系。结果表明，转盘表面润湿性对于液膜呈滴状以及滴状向纤维状模式转变影响显著，未完全润湿导致临界流量存在一定的随机性，转盘直径与临界流量间无明确规律；而完全纤维状以及膜状时，大直径转盘临界流量明显升高。转速、流量、密度及黏度的提高，破碎模式趋向于膜状；而增大表面张力，即使对于较大流量和转速，液膜也能维持纤维状或滴状模式。调整转盘直径将引起表面张力与离心力同时变化，若未打破平衡，其破碎模式不会改变。研究结果为转盘粒化器的设计与优化提供了可借鉴的理论与应用基础。

关键词: 流体力学, 模型, 实验验证, 破碎模式, 转盘, 转变特性

Abstract:

Liquid film breakup mode at disk rim of centrifuge particle generator directly determines droplet shapes and sizes, which is a key factor to affect product qualities. A critical transition coefficient for spinning disk particle generator was proposed to characterize liquid film breakup transition characteristics from film to ligament, to extend to other breakup modes, and to establish critical equations for transition from direct droplet to ligament, ligament to fully ligament, and fully ligament to sheet. The experimental results of three working fluids and two disks indicated that disk surface wettability played key role for liquid film to become direct droplet or to transit from direct droplet to ligament, which incomplete wetting caused random critical volume flow rate with no direct correlation between disk diameter and critical volume flow rate. Critical volume flow rate increased with increasing disk diameter in fully-ligament and film modes. In general, the increase of liquid flow rate, rotation speed, liquid density, and viscosity drove towards film breakup mode. However, high surface tension force maintained liquid film in direct drop or ligament even at large flow rate and rotation speed. Moreover, increasing disk diameter enhanced both centrifugal force and surface tension and breakup mode did not change unless the force balance was lost.

Key words: fluid mechanics, model, experimental validation, breakup mode, spinning disk, transition characteristics

中图分类号:

TQ021.1

王东祥, 凌祥, 彭浩, 崔政伟, 杨新俊. 转盘边缘黏性薄液膜不同破碎模式临界转变特性[J]. 化工学报, 2017, 68(11): 4121-4128.

WANG Dongxiang, LING Xiang, PENG Hao, CUI Zhengwei, YANG Xinjun. Critical breakup transition characteristics of thin viscose liquid film at spinning disk rim[J]. CIESC Journal, 2017, 68(11): 4121-4128.

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转盘边缘黏性薄液膜不同破碎模式临界转变特性

Critical breakup transition characteristics of thin viscose liquid film at spinning disk rim

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