Abstract
We have measured the flow field inside microdroplets formed by two immiscible fluids in a microchannel using micro particle image velocimetry (micro-PIV) technique. An aqueous liquid with fluorescent particles was injected in an immiscible carrier flow. Both velocity fields during the droplet formation process and during the passage in straight, rectangular microchannels were measured and evaluated. We observed that at a certain layer the direction of the outer circulation flow in the droplet is the same as that of the droplet motion. The results indicate that the immiscible carrier fluid flows through the gaps between the aqueous droplet and the rigid channel wall at a velocity faster than the droplet itself.
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