Computer Simulation of Magnetic Resonance Imaging of the Flow of Fluidized Particles
Computer Simulation of Magnetic Resonance Imaging of the Flow of Fluidized Particles
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DOI：
10.1021/acs.iecr.3c01021
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发表时间：
2023-07-12
影响因子：
4.2
通讯作者：
Boyce，Christopher M.
中科院分区：
文献类型：
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作者：
Bordbar，Alireza;Benders，Stefan;Boyce，Christopher M.
快速磁共振成像（MRI）和测速（MRV）是3D不透明系统中的非侵入性测量技术，具有10 ms的时间分辨率，为挑战流动计算模型的准确性提供了新的机会。快速MRI/MRV和计算机模拟之间的比较受到以下因素的限制：（i）快速MRI技术中的伪影，以及（ii）计算机模拟数据后处理的非平凡方面，以最佳匹配测量技术。在这里，我们通过从流化颗粒的计算机流动模拟的数据开始，并将数据馈送到基于物理的MRV测量模拟来解决这些问题，该模拟捕获了由测量技术引入的潜在伪影。然后以各种方式对流动模拟数据进行后处理，证明（1）必须在不同时间点从流动模拟中获取速度和颗粒位置数据以匹配MRV测量值，以及（2）成像必须比MRV的流动波动更快，以有效地产生瞬时速度场。
Rapid magnetic resonance imaging (MRI) and velocimetry (MRV) are non-invasive measurement techniques in 3D opaque systems with ∼10 ms temporal resolution, enabling new opportunities to challenge the accuracy of computational models of flow. Comparisons between rapid MRI/MRV and computer simulations are limited by (i) artifacts in rapid MRI techniques and (ii) non-trivial aspects of post-processing of computer simulation data to best match the measurement techniques. Here, we address these issues by starting with data from computer flow simulations of fluidized particles and feeding the data to a physics-based simulation of MRV measurements, which captures potential artifacts introduced by the measurement techniques. Flow simulation data is then post-processed in various ways, demonstrating that (1) velocity and particle position data must be taken from flow simulations at different points in time to match MRV measurements and (2) imaging must be faster than flow fluctuation for MRV to produce effectively instantaneous velocity fields.