Abstract
The microchannels have many advantages, such as reagent saving, energy saving and improved reaction efficiency due to shorter reaction time. For example, the microreactors with the microchannels can generate mixed reactants in a short time. In this study, the microchannels were formed by scanning the CO2 laser beams on the fused glass substrates. Then, it was considered to generate the turbulence flows in the microchannels, since the fine continuous dimples on the bottom surfaces of the microchannels are generated by varying the overlap rate of the pulsed laser. As a result, it was found that the turbulence flows tended to occur, since the bigger dimples were formed due to the longer pulse width with the lower overlap rate. On the other hand, the turbulence flows were unlikely to occur, since the smaller dimples were formed due to the shorter pulse width with the higher overlap rate. Therefore, the mixing effect and the reaction efficiency of the microreactors would be improved by forming the larger continuous fine dimples on the bottom surface of the microchannels with the lower overlap rate, since there is a relationship between the size of the dimples and the turbulence flows in the microchannels.
