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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY · 2017 · IF 4.421

Breakup dynamics of ferrofluid droplet in a microfluidic T-junction

Rui Ma,Taotao Fu,Qindan Zhang,Chunying Zhu,Youguang Ma,Huai Z. Li

This paper investigated the breakup dynamics of ferrofluid droplet in a microfluidic T-junction with the magnetic field. Droplet breakup types with permanent obstruction, part obstruction and without obstruction were observed. The droplet breakup processes with permanent and part obstruction could be divided into squeezing, transition and pinch-off stages. The minimum width of droplet neck could be scaled as power-law relationships with time for squeezing stage and with remaining time for the last two stages. The droplet breakup process without obstruction has only last two stages. The results show that the magnetic field could affect the dynamics of droplet breakup.

CAS / MDL: 8020-83-5

研究领域: 流体力学 · 生物医学工程

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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS · 2017 · IF 2.714

Micro-magnetofluidics of ferrofluid droplet formation in a T-junction

Qindan Zhang,Huajun Li,Chunying Zhu,Taotao Fu,Youguang Ma,Huai Z. Li

The combination of microfluidics with magnetism has led to the emergence of a new scientific domain known as micro-magnetofluidics. The present study aims to investigate the interfacial dynamics of ferrofluid droplet formation under magnetic field in a microfluidic T-junction. A non-uniform magnetic field was constructed by placing a permanent magnet at one side of the T-junction. Three typical flow regimes including the slug, slug-dripping transition and dripping flow were observed. The external magnetic field promotes the transition from the slug-dripping transition flow to the slug flow, prolongs the generation cycle of ferrofluid droplets and hinders the ferrofluid droplet formation. As the magnetic flux density increases, both the increasing rate of the length for the thread tip and the expanding rate of the dispersed neck decrease, and the peak value of the minimum width of the dispersed neck increases. The ferrofluid droplet size increases with increasing the magnetic flux density while decreases with increasing the two-phase flow rate ratio and the capillary number. A scaling law is proposed to predict the size of ferrofluid droplets, by taking the two-phase flow rate ratio, capillary number and magnetic Bond number into account.

CAS / MDL: 8020-83-5

研究领域: 物理学 · 流体力学 · 微流控技术

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Breakup dynamics of ferrofluid droplet in a microfluidic T-junction

Micro-magnetofluidics of ferrofluid droplet formation in a T-junction