Enhancement of measurement accuracy of X-ray PIV in comparison with the micro-PIV technique

In this study, a new two-dimensional velocity field extraction technique is proposed to overcome technological limitations. To resolve the problem of finding a correction coefficient, the velocity field information obtained by X-ray PIV and micro-PIV techniques for disturbed flow in a concentric stenosis with 50% severity was quantitatively compared. Micro-PIV experiments were conducted for single-plane and summation images, which provide similar positional information of particles as X-ray images. The correction coefficient was obtained by establishing the relationship between velocity data obtained from summation images (VS) and centre-plane images (VC). The velocity differences between VS and VC along the vertical and horizontal directions were quantitatively analysed as a function of the geometric angle of the test model for applying the present two-dimensional velocity field extraction technique to a conduit of arbitrary geometry. Finally, the two-dimensional velocity field information at arbitrary positions could be successfully extracted from X-ray images by using the correction coefficient and several velocity parameters derived from VS.

Source: Journal of Synchrotron Radiation - February 13, 2018 Category: Physics Authors: Park, H. Jung, S.Y. Park, J.H. Kim, J.H. Lee, S.J. Tags: X-ray PIV micro-PIV stenosis biofluid flow correction coefficient research papers Source Type: research