VISUALIZATION TECHNIQUE FOR 3D BUBBLE RECONSTRUCTION AND SURFACE AREA DEDUCTION FOR INTERFACIAL TRANSPORT ANALYSIS IN FUEL ROD BUNDLE SUBCHANNEL International Symposium on Symbiotic Nuclear Power (ISSNP2024)

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VISUALIZATION TECHNIQUE FOR 3D BUBBLE RECONSTRUCTION AND SURFACE AREA DEDUCTION FOR INTERFACIAL TRANSPORT ANALYSIS IN FUEL ROD BUNDLE SUBCHANNEL

编号：93 访问权限：公开更新：2024-09-20 12:47:31 浏览：155次张贴报告

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摘要

Bubble surface area plays a critical role in understanding multiphase flow dynamics in various engineering applications, including nuclear reactor coolant systems. One key parameter in the Two-Fluid model used for modeling two-phase flow is the interfacial area concentration which has a relationship with bubble surface area. This study presents a computer vision methodology called Bublipse3D for calculating the surface area of bubbles from 2D images through a series of image processing and computational techniques. High-speed photography is utilized to capture sequential 2D images of bubbles in a 2×2 rod bundle subchannel. Image preprocessing techniques, such as noise reduction, thresholding, and edge detection, are applied to enhance image quality and facilitate accurate bubble detection. Detected bubbles in the 2D images are then used for 3D reconstruction employing Bublipse3D which assumes bubble rotational symmetry to generate a 3D point cloud from 2D contours. Once the 3D shapes of the bubbles are reconstructed, surface extraction algorithms, are applied to generate surface meshes. The surface area of these meshes is then computed using computational geometry libraries. This comprehensive approach enables accurate surface area estimation, providing valuable insights into bubble dynamics within rod bundle subchannels, which is essential for the accurate prediction of the interfacial area concentration.