Visualization of Fluorescent Particle Behavior near Solid Walls and Velocity Measurement Based on Particle Tracking

Abstract

In the case of heat transport colloids such as nanofluids in which nano-sized particles are dispersed in a liquid, the effect on heat transfer based on the motion of the dispersed particles is considered in addition to the fluid motion of the solvent. We focused on the behavior of dispersed particles. A solution of suspended fluorescent particles was flowed into a test channel under pressure and observed at a distance of about 1 μm from the wall. Based on the principle of fluorescence microscopy, we visualized the movement of particles using transmitted light and total reflection light. We tried to measure the velocities of the fluorecent particles by particle tracking velocimetry.The results showed that the behavior of individual particles was affected near the wall side.