Bulk NMR Measurements of Spray Dynamics

IF 1.1 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Applied Magnetic Resonance Pub Date : 2023-08-18 DOI:10.1007/s00723-023-01562-7

D. Osmond, W. Selby, L. Romero-Zeron, I. Mastikhin

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引用次数: 0

Abstract

Spray systems present unique challenges for fluid mechanics research due to their complex dynamics. Non-optical techniques such as synchrotron X-rays and magnetic resonance imaging (MRI) are promising measurement avenues for non-invasive studies of opaque or enclosed sprays. Previous MRI studies of sprays employed sophisticated pulse sequences possible only with an MRI scanner. In this work, we explore the potential of simple bulk NMR techniques, pulsed-field-gradient (PFG), time-of-fight (TOF), and dynamic magnetic resonance scattering to investigate spray dynamics in three distinct regions. A variable recovery delay was employed to filter signal contributions based on velocity. The PFG measurements of mechanical dispersion are the first of their kind to our knowledge, yielding dispersion coefficients in the range of 10^–4–10^–3 m²/s. Velocity measurements successfully detected velocities surpassing 30 m/s near the nozzle, with the flow slowing down to several m/s downstream. These techniques show potential for investigating spray dynamics and simple gradient requirements making them suitable for portable NMR applications and in situ measurements.

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喷雾动力学的体核磁共振测量

喷雾系统由于其复杂的动力学特性，给流体力学研究带来了独特的挑战。非光学技术，如同步加速器x射线和磁共振成像(MRI)是非侵入性研究不透明或封闭喷雾的有前途的测量途径。以前对喷雾剂的核磁共振研究采用了复杂的脉冲序列，只有核磁共振扫描仪才能实现。在这项工作中，我们探索了简单体核磁共振技术、脉冲场梯度(PFG)、战斗时间(TOF)和动态磁共振散射的潜力，以研究三个不同区域的喷雾动力学。采用可变恢复延迟对基于速度的信号贡献进行滤波。机械色散的PFG测量是我们所知的第一个此类测量，产生的色散系数范围为10-4-10-3 m2/s。速度测量成功地检测到喷嘴附近的速度超过30米/秒，下游的流速减慢到几米/秒。这些技术显示出研究喷雾动力学和简单梯度要求的潜力，使其适用于便携式核磁共振应用和现场测量。

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来源期刊

Applied Magnetic Resonance 物理-光谱学

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

2.3 months

期刊介绍： Applied Magnetic Resonance provides an international forum for the application of magnetic resonance in physics, chemistry, biology, medicine, geochemistry, ecology, engineering, and related fields. The contents include articles with a strong emphasis on new applications, and on new experimental methods. Additional features include book reviews and Letters to the Editor.