• emission of liquid droplets from an interface of bidrops pulled by a ferrofluid in a microchannel

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 731
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     in various microfluidic devices, controlling the flow rate of liquid or gas accurately at micro or nanoliter volume levels is required. by using a ferrofluid, the flow of a liquid or gas in a microchannel can be controlled by the driving power exerted on the ferrofluid. in our previous study, an unsteady flow of a liquid slug caused by the driving force from the ferrofluid was investigated in a 200 μm circular microchannel. in the present study, combinations of various liquids with the ferrofluid were examined in two microchannels (130 μm and 200 μm diameter). the relationship between the emission of liquid droplets and interfacial deformation of the bidrops was investigated experimentally and analytically. the emission of liquid droplets from the deforming interface of the bidrop was studied for liquids of different viscosities. the interface shape was observed to change continuously until a liquid droplet was emitted from the interface of the immiscible liquids. when the ferrofluid velocity was increased, necking of the liquid–liquid interface occurred and some liquid droplets were emitted from the interface. the mechanism of liquid droplet emission following the interfacial deformation was characterized, and a correlation was developed for the emitted droplet velocity in terms of capillary, reynolds and weber numbers.

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