Abstract
Recently, the Molecular Tagging Velocimetry (MTV) has been eagerly studied as a nonintrusive velocity measurement technique, which is a similar technique to the Particle Tracking Velocimetry (PTV) whereas using tagged molecules instead of particles: the tagged molecules are tracked and visualized to obtain the displacement during a certain period, and the flow velocity was calculated from the time of flight technique. By using the photodissociation of NO2 as a tagging technique, we applied MTV to the internal gaseous flow through a rectangular channel. The flow velocity distribution indicates the Poiseuille-like flow in the center plane. The flow velocity of the center axis was compared with the theoretical value where 2D flow between parallel plates was assumed, and showed good agreement within an experimental error. The time duration between the tagging and the visualization was able to extend at least 100μs, which allows us to measure much lower velocity.
