Examinando por Autor "Fraccarollo, Luigi"

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  • Miniatura
    Ítem
    High-speed video recordings of metal powder pneumatic conveying in thin capillary pipes
    (2025) Pedrolli, Lorenzo; Fraccarollo, Luigi; Achiaga, Beatriz; López García, Alejandro
    Many industrial processes require a consistent material flow in the form of powders, typically achieved through pneumatic conveying. This work presents a dataset of high-speed video recordings capturing the horizontal pneumatic conveying of metallic powders in thin capillary pipes. Additionally, pressure and photodiode recordings are included. The experimental setup is described in detail, with suggestions for potential improvements. In the video recordings, each particle is individually distinguishable and can be tracked across frames
  • Miniatura
    Ítem
    Optical particle tracking in the pneumatic conveying of metal powders through a thin capillary pipe
    (Multidisciplinary Digital Publishing Institute (MDPI), 2024-10-03) Pedrolli, Lorenzo; Fraccarollo, Luigi; Achiaga, Beatriz; López García, Alejandro
    Directed Energy Deposition (DED) processes necessitate a consistent material flow to the melt pool, typically achieved through pneumatic conveying of metal powder via thin pipes. This study aims to record and analyze the multiphase fluid–solid flow. An experimental setup utilizing a high-speed camera and specialized optics was constructed, and the flow through thin transparent pipes was recorded. The resulting information was analyzed and compared with coupled Computational Fluid Dynamics-Discrete Element Modeling (CFD-DEM) simulations, with special attention to the solids flow fluctuations. The proposed methodology shows a significant improvement in accuracy and reliability over existing approaches, particularly in capturing flow rate fluctuations and particle velocity distributions in small-scale systems. Moreover, it allows for accurately analyzing Particle Size Distribution (PSD) in the same setup. This paper details the experimental design, video analysis using particle tracking, and a novel method for deriving volumetric concentrations and flow rate from flat images. The findings confirm the accuracy of the CFD-DEM simulations and provide insights into the dynamics of pneumatic conveying and individual particle movement, with the potential to improve DED efficiency by reducing variability in material deposition rates