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EAGER: Viability study for interfacial spectroscopy

EAGER：界面光谱的可行性研究

基本信息

批准号：
2137638
负责人：
Sukalyan Bhattacharya
金额：
$ 23.53万
依托单位：
Texas Tech University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2137638&HistoricalAwards=false
关键词：
EAGER Viability study interfacial spectroscopy

项目摘要

When a liquid drop is subjected to an external force, it typically undergoes oscillations in its shape with a frequency that depends on the material properties of the drop. In some naturally occurring and technological processes of interest, drops contain inclusions in their interior. These inclusions, which could be small bubbles or solid particles, can affect the characteristic oscillations of the drop. The goal of this EAGER proposal is to show that by measuring the frequency of drop oscillations, the size, number and locations of such inclusions can be determined. The project will use a combination of theory, numerical computations and experiments to demonstrate the feasibility of this idea, which is called “interfacial spectroscopy.” The results could be useful as a quality control tool in a variety of processing operations involving such materials as inks, paints, and other suspensions or to detect impurities and contaminants in multiphase systems. The project will involve high-school students and undergraduates in the design and implementation of experiments to validate the approach.Natural pulsations of multiphase systems like particle-laden drops exhibit surface waves with intriguing frequency and decay features. Recent studies have shown that slightly deviating frequencies for a few modes form bands akin to fine-structure split in atomic energy levels. It can be shown that such frequency and decay spectra are unique for each internal structure of the multiphase multispecies domains. This suggests the possibility of finding what is inside a complicated opaque liquid from experimentally measured interfacial wave spectra data. This EAGER project will establish the viability and accuracy of this diagnostic technique. The project will concentrate on four specific matters considering particle-laden drops to be the representative of complex systems. First, simulations will demonstrate how frequencies and decay constants of interfacial waves vary with size, number and position of the particles inside a droplet. Secondly, an inversion algorithm will be devised to extract the particulate details from spectral information. Then, the diagnostic procedure will be applied in real experiments to test the capability and the limit of the technology. Fourthly, the uniqueness theorem for inversion will be generalized to see whether more complex structures can be revealed using the approach.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

当液滴受到外力时，它通常以取决于液滴的材料性质的频率经历其形状的振荡。在一些自然发生的和感兴趣的技术过程中，液滴在其内部包含夹杂物。这些夹杂物可能是小气泡或固体颗粒，会影响液滴的特征振荡。这个EAGER建议的目标是表明，通过测量液滴振荡的频率，可以确定这种夹杂物的大小，数量和位置。该项目将使用理论、数值计算和实验相结合的方法来证明这一想法的可行性，这一想法被称为“界面光谱学”。结果可能是有用的，作为一个质量控制工具，在各种处理操作涉及这样的材料，如油墨，油漆，和其他悬浮液或检测杂质和污染物在多相系统。该项目将涉及高中生和大学生的实验设计和实施，以验证该方法。自然脉动的多相系统，如粒子负载液滴表现出表面波与有趣的频率和衰减功能。最近的研究表明，一些模式的轻微偏离频率形成类似于原子能级中精细结构分裂的带。它可以表明，这样的频率和衰减谱是唯一的多相多物种域的每个内部结构。这表明有可能从实验测量的界面波谱数据中找到复杂的不透明液体内部的东西。这个EAGER项目将建立这种诊断技术的可行性和准确性。该项目将集中在四个具体问题上，认为载有颗粒的液滴是复杂系统的代表。首先，模拟将展示界面波的频率和衰减常数如何随液滴内颗粒的大小、数量和位置而变化。其次，将设计一个反演算法，从光谱信息中提取颗粒细节。然后，将诊断程序应用于真实的实验中，以测试该技术的能力和局限性。第四，反演的唯一性定理将被推广，以了解是否可以使用该方法来揭示更复杂的结构。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。