2001 Volume 21 Issue 1Supplement Pages 257-258
The authors try to measure the velocity distribution of water flows in a micro channel (0.4 millimeters width and 0.1 millimeters depth rectangular section) by PTV. Under the room temperature, water containing 2μ-diameter tracer particles flows vertically downward in a channel. High-resolution video camera is used for grabbing images of tracer particles with illumination of a metal-halide lamp. The depth of focus is 0.04 millimeters and the focus point is adjusted at the center of the channel. The velocity distribution of micro channel flow can be obtained by PTV analysis. And the case that there is a small air bubble on the one-sided wall of a channel is also observed. In this case, the velocity of water nearby the bubble is larger than that nearby the solid wall.
