D123 流体の局所的温度変化を利用した光学的物質移動技術に関する研究(表面張力・電気浸透流)

概要

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A novel technique of non-instructive microflow control with laser-induced temperature change is described in this paper. In microscale, the scale effect in heat and mass transfer appears and phenomenon is governed by properties of fluids or devices. Generation of local distribution of property have a potential to control flow behavior in microfluids. Absorption of focused laser beam causes local temperature distribution and results in the properties change. We have developed an experimental system to induce local temperature rise in microchannel flow and to measure the velocity profile simultaneously. Velocity measurement is performed by micro-PIV (particle image velocimetry) technique. During the laser irradiation, flow velocity around the hot spot increases by approximately 15%. It is found that the principal factor of the velocity variation of microflow is the temperature dependence of liquid viscosity. Validity of the laser-induced viscosity distribution for liquid flow in microfluidic device is confirmed both experimentally and numerically.
2007-11-23