By Ryan T Kelly
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Extra info for Advances in microfluidics
According to the time required by the different mechanisms involved (heating, evaporation, condensation, coalescence, ﬁlm advance), they estimated a maximal possible ﬂow velocity of 1 mm s−1 . Boyd et al. (2008) have recently proposed an alternative scheme involving the transfer of mass across a bubble in a partly ﬁlled microﬂuidic channel. A gas bubble is formed in the liquid phase, and a heating laser beam is focused in the liquid just behind the bubble. By slightly increasing the temperature at the rear of the bubble, the laser induces evaporation and the vapor then condenses at the front interface.
The Reynolds number for the outlet stream is below Re=10. The diffusion path is much smaller than the width of focused stream. The width of focused stream is smaller than the depth of correlation of the microscope. The proposed correlation equations (7) and (8) are used to estimate preliminarily the shape and position of focused stream inside the channel which enables determination of the region in which condition 3 is satisfied, and consequently enables quick identification of the applicability of the SeS-PIV method.
The resulting ﬂuid motion can follow complex paths inside a microﬂuidic channel (right pictures). Adapted from Liu et al. (2006). (b) Cavitation-induced droplet generation: a cavitation bubble created by a nanosecond pulsed laser expands and pushes a controlled volume of water into a parallel oil ﬂow. 5 (left) and 10 kHz (right, the three droplets shown here result from three successive pulses). Adapted from Park et al. (2011). , 1989). The basic mechanism can be summarized as follows. A high-intensity light pulse is absorbed by an impurity contained in the transparent liquid, triggering optical breakdown.