光異性化による円管内液体駆動現象の直接数値解析

抄録

Liquid manipulation by photoisomerization attracts much attention as a new active droplet control method for microchemical analysis. Such a manipulation can be realized by a use of solution liquid of surfactant that exhibits the cis-trans isomerization due to light irradiation with a specific wavelength such as ultraviolet light. This isomerization provides also changes in the contact angle and surface tension of the liquid. The manipulation of liquid can be performed by utilizing this property: the specific-light irradiation on a one-side surface of the liquid column in a tube would generate differences in the contact angle and surface tension between the both sides of the liquid column. Although the control have been demonstrated experimentally, its flow dynamics and developments of each isomer distribution are not fully understood. In order to reveal the phenomenon, we performed direct numerical simulation of air-liquid flows and its scalar transport of the isomer, using a software of OpenFOAM.