Synchrotron X-ray multi-projection imaging (XMPI) for high-resolution 4D characterization of multiphase flows

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2026-07-23 DOI:10.1007/s00348-026-04271-6

Tomas Rosén, Zisheng Yao, Jonas Tejbo, Patrick Wegele, Julia K. Rogalinski, Frida Nilsson, Kannara Mom, Zhe Hu, Samuel A. McDonald, Kim Nygård, Andrea Mazzolari, Alexander Groetsch, Korneliya Gordeyeva, L. Daniel Söderberg, Fredrik Lundell, Lisa Prahl Wittberg, Eleni Myrto Asimakopoulou, Pablo Villanueva-Perez

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Abstract

Multiphase flows where particles, bubbles, or droplets are suspended in a fluid govern critical processes in biology, medicine, materials processing, and geophysics. However, observing their microscale dynamics in opaque systems has remained a fundamental challenge. We present Synchrotron X-ray Multi-Projection Imaging (XMPI), a novel approach enabling four-dimensional (3D + time) tracking of microparticles in visibly opaque suspension flows without requiring sample rotation. By capturing simultaneous projections from multiple angles using beam-split X-rays at synchrotron facilities, we resolve instantaneous particle positions and trajectories in opaque fluids such as blood. We demonstrate the potential of XMPI through individual particle tracking velocimetry (3D PTV) in dilute conditions, as well as multi-projection image velocimetry in dense suspensions. The methodology provides otherwise inaccessible experimental validation for particle-resolved computational fluid dynamics models and allows, e.g., observation of inertial focusing effects and microstructural dynamics relevant to suspension rheology and biomedical flows. This work paves the way for high-resolution, time-resolved 4D imaging of complex multiphase flows across a range of scientific and industrial applications. Combining XMPI with recent AI-supported 4D reconstruction algorithms opens a new spatiotemporal frontier for high-speed, rotation-free microtomography.

Graphical abstract

Abstract Image

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同步加速器x射线多投影成像（XMPI）用于多相流的高分辨率四维表征。

颗粒、气泡或液滴悬浮在流体中的多相流控制着生物学、医学、材料加工和地球物理学的关键过程。然而，在不透明体系中观察它们的微观动力学仍然是一个基本的挑战。我们提出了同步加速器x射线多投影成像（XMPI），这是一种新颖的方法，可以在不需要旋转样品的情况下对可见不透明悬浮流中的微粒进行四维（3D +时间）跟踪。通过在同步加速器设施中使用光束分裂x射线捕获多个角度的同时投影，我们可以解决不透明流体（如血液）中的瞬时粒子位置和轨迹。我们通过稀释条件下的单个粒子跟踪测速（3D PTV）以及密集悬浮液中的多投影图像测速证明了XMPI的潜力。该方法为颗粒分解计算流体动力学模型提供了难以获得的实验验证，并允许观察惯性聚焦效应和与悬浮液流变学和生物医学流动相关的微观结构动力学。这项工作为在一系列科学和工业应用中实现复杂多相流的高分辨率、时间分辨率4D成像铺平了道路。将XMPI与最新的人工智能支持的四维重建算法相结合，为高速、无旋转的微断层扫描开辟了新的时空前沿。图片摘要：补充资料：在线版本包含补充资料，网址为10.1007/s00348-026-04271-6。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.