3D Measurements of a Two-Phase Flow Inside an Optical Cylinder Based on Full-Field Cross-Interface Computed Tomography

Three-dimensional (3D) tomographic reconstruction in confined-space requires a mapping relationship which considers the refraction distortion caused by optical walls. In this work, tomography method, namely full-field cross-interface computed (FCICT), is proposed to solve confine-space problems. The FCICT method utilizes Snell’s law and reverse ray-tracing analytically correct imaging establishes from 3D measurement domain 2D images. Numerical phantom study first employed validate method. Afterwards, applied on experimental of an illuminated two-phase jet flow initially generated inside cylinder then gradually moves outside. comparison between accurately reconstructed liquid coarse result traditional open space algorithm provides practical validation FCICT. Based reconstructions at different time sequences, distributions surface velocity curvatures are calculated, their correspondences systematically analyzed. It found that point positively correlated with mean curvature same point, indicates concavity/convexity possibly accordance velocity. Moreover, presents monotonical increasing trend larger Gaussian for elliptic points only, due dominated Brownian motion as develops.