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A new atomization method in W/O (water in oil) system was developed for liquid sampling system of.μTAS (micro total analysis systems). This device was masufactured using soft MEMS (micro electro mechanical systems) technology and comprised of simple rectangular microchannels made of PDMS (polydimethylsiloxane). Using this device, picoliter-sized cylindrical liquids were generated successfully and sequentially. To investigate the breakup motion of cylindrical liquid in microchannel, a light emitting diode system was developed for the function of the strobe light. Furthermore, theoretical analysis was carried out to predict the size of cylindrical liquids. The effects of continuous phase velocity and microchannel wall on the diameter of cylindrical liquids were clarified experimentally and numerically. The numerical results of cylindrical liquid diameter quantitatively agreed with the experimental results. According to this theoretical model developed here, the device can be optimized to generate smaller and uniform cylindical liquids.

Development of Atomization Method in Microchannel and Its Basic Characteristics