Abstract
Endoscopic PIV has been developed to measure flows in opaque equipment. It is however difficult to measure velocities near the edge of the field of view in the endoscopic PIV due to the Lagrangian nature of PIV. The authors developed an Eulerian velocimetry, that is, spatial filter velocimetry (SFV) to realize the simultaneous multipoint measurement of velocity with a high spatial resolution and high accuracy. In this study, we visualized natural convection of water in a pan heated by a cooking stove using a high-speed video camera with a borescope. The velocity distribution in the field of view of the borescope is evaluated by SFV to examine applicability of SFV to measurement of a velocity distribution from the borescope images. The experimental results indicated that SFV can measure the velocity accurately at arbitrary multiple points in the filed of view. The results also demonstrated the high applicability of SFV to the whole field measurement of velocity in the field of view of endoscopic visualization.
