Patent ID: 7401970

Claim:
A fluid mixing reaction enhancement method using a micro device which makes a plurality of fluids mixedly reacted by joining the fluids into one microchannel through each of a plurality of fluid supply passes, comprising: providing said microchannel; and inducing a velocity fluctuation in a microchannel longitudinal direction in the fluids by propagating infralow frequency vibration at a vibration frequency of at least 50 Hz and less than 1 kHz to the fluids which flow through an inside of the microchannel, wherein an opening width of the microchannel is at least 10 μm and not more than 1000 μm; said method further comprising: inducing velocity fluctuation in fluids which flow through the inside of the microchannel by vibrating a tube coupled to the fluid supply passes; quantitatively evaluating a mixed state in the microchannel based on a vibration speed variation strength of a tube, the vibration speed variation strength defined by the square root of a sum of time means of square of u t (t) and square of v t (t): √{square root over ( u t 2 + v t 2 )} where u t (t) and v t (t) represent, respectively, horizontal speed variation of the tube and vertical speed variation of the tube, which are obtained by performing time differentiation of displacements of the tubes in a horizontal direction and a vertical direction respectively; and based on the evaluation result, controlling the vibration frequency within a range of the frequency which is at least 50 Hz and less than 1 kHz so that the velocity fluctuation strength can be maximized.