自标定立体显微PIV系统研发及其在T型混合器中三维流动测量中的应用
A stereo-μ -PIV system for the measurement of all three components of the velocity vector in ameasurement plane (2D-3C) in a closed microchannel has been developed and first test measurements have beenperformed on the three-dimensional laminar flow in a T-shaped micromixer. Stereo-μ -PIV measurements in closedmicrochannels require a calibration based on the self-calibration of the tracer particle images. In order to include theeffects of different refractive indices of the water in the microchannel, the glass of the entrance window, and thesurrounding air a three-media-model is included in the triangulation procedure of the self calibration. A preliminarytest case shows that the stereo-μ -PIV results deviate less than 5% from theoretical values. First measurements in themixing zone of a T-shaped micromixer show that three-dimensional flow in a microchannel can be resolved,however, the accuracy of the measurements needs to be improved.