CAREER: Influence of electric fields on liquid-to-solid phase change associated with clathrate hydrate formation

职业：电场对与笼形水合物形成相关的液固相变的影响

• 批准号: 1653412
• 负责人: Vaibhav Bahadur
• 金额: $ 50万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2023-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1653412&HistoricalAwards=false
• 关键词: CAREER; Influence; electric; fields; liquid

CAREER: Investigation of the fundamental mechanisms underlying electric field-induced formation of hydratesClathrate hydrates are water-based crystalline solids consisting of a guest molecule (methane, carbon dioxide, tetrahydrofuran, cyclopentane and others) trapped in a lattice of water molecules. Hydrates can be the basis of novel applications in many energy-water related areas such as natural gas transportation, desalination and carbon sequestration. A significant challenge associated with hydrate formation is the long wait time before hydrates start forming (nucleate), which can range from hours to days. Recent studies indicate that applied electrical voltages can significantly accelerate hydrate formation, and reduce the wait time by a factor of hundred or more. This electro-nucleation concept can enable rapid and controlled synthesis of hydrates for the above applications, all of which require rapid hydrate formation. This project is a fundamental study of the mechanisms underlying electric-field induced formation of hydrates. The influence of electric charge, current flow, heat transfer and surface chemistry on hydrate formation will be analyzed for three kinds of hydrates. Overall, this work will lead to seminal contributions in the fields of hydrates and liquid-to-solid phase change. The results of this project have the potential of completely eliminating the delay in hydrate formation, and enabling "on-demand" hydrate formation. Results from this research will be integrated into educational activities, which include the development of a graduate level course on Phase Change Heat Transfer and research opportunities for undergraduates and under-represented minorities. This project studies the electro-nucleation of three kinds of hydrates. In the first set of studies, hydrate formation from two immiscible liquids will be analyzed. Cyclopentane hydrate formation will be studied via experiments and analytical modeling to quantify the role of electric fields and interfacial charge on hydrate nucleation. In the second set of studies, hydrate formation from miscible liquids will be analyzed. Tetrahydrofuran hydrate formation will be analyzed to understand the influence of electric current and the resultant bubble generation on nucleation. The third set of studies will analyze electro-nucleation of methane hydrates, wherein hydrates nucleate at a liquid-gas interface at elevated pressures. This project includes nucleation-measurement experiments, analytical multiphysics modeling, and correlation development. Microfluidic cells will be fabricated to obtain statistically meaningful estimates of electro-nucleation. Specific outcomes of this project include measurements of electro-nucleation rates, and an understanding of the physics underlying the formation of various hydrates. This project will highlight the role of electric fields in fundamentally changing the nature of nucleation from stochastic to deterministic. Overall, this research will enable an in depth understanding of the influence of electrical phenomena on micro/mesoscale thermo-fluidic phenomena associated with hydrate formation.

职业：笼形水合物是一种以水为基质的结晶固体，由一个客体分子（甲烷、二氧化碳、四氢呋喃、环戊烷等）包裹在水分子的晶格中。水合物可以成为许多能源-水相关领域的新应用的基础，如天然气运输、海水淡化和碳封存。与水合物形成相关的一个重大挑战是水合物开始形成（成核）之前的长等待时间，其范围可以从数小时到数天。最近的研究表明，施加的电压可以显著加速水合物的形成，并将等待时间减少数百倍或更多。这种电成核概念可以实现用于上述应用的水合物的快速和受控合成，所有这些应用都需要快速水合物形成。本计画为电场诱导水合物形成机制之基础性研究。针对三种水合物，分析了电荷、电流、传热和表面化学对水合物生成的影响。总的来说，这项工作将导致在水合物和液固相变领域的开创性贡献。该项目的结果有可能完全消除水合物形成的延迟，并实现“按需”水合物形成。这项研究的结果将被纳入教育活动，其中包括相变传热研究生课程的发展和本科生和代表性不足的少数民族的研究机会。 本项目研究了三种水合物的电成核过程。在第一组研究中，将分析两种不混溶液体的水合物形成。环戊烷水合物的形成将通过实验和分析建模来研究，以量化电场和界面电荷对水合物成核的作用。在第二组研究中，将分析从可混溶液体形成水合物。将分析四氢呋喃水合物的形成，以了解电流和由此产生的气泡生成对成核的影响。第三组研究将分析甲烷水合物的电成核，其中水合物在高压下在液-气界面处成核。该项目包括成核测量实验，分析多物理场建模，和相关的发展。将制造微流体池以获得电成核的统计学上有意义的估计。该项目的具体成果包括电成核率的测量，以及对各种水合物形成的物理基础的理解。这个项目将突出电场在从根本上改变成核的性质从随机到确定性的作用。总体而言，这项研究将使深入了解电现象对与水合物形成相关的微/中尺度热流体现象的影响。

项目成果

Faster Nucleation of Ice at the Three-Phase Contact Line: Influence of Interfacial Chemistry

• DOI: 10.1021/acs.langmuir.1c02044
• 发表时间: 2021-10-25
• 期刊: LANGMUIR
• 影响因子: 3.9
• 作者: Kar, Aritra;Bhati, Awan;Bahadur, Vaibhav
• 通讯作者: Bahadur, Vaibhav

Diffusion-based modeling of film growth of hydrates on gas-liquid interfaces

• DOI: 10.1016/j.ces.2021.116456
• 发表时间: 2021-02-08
• 期刊: CHEMICAL ENGINEERING SCIENCE
• 影响因子: 4.7
• 作者: Kar, Aritra;Bhati, Awan;Bahadur, Vaibhav
• 通讯作者: Bahadur, Vaibhav

Fundamental interfacial mechanisms underlying electrofreezing

• DOI: 10.1016/j.cis.2017.12.003
• 发表时间: 2018-01-01
• 期刊: ADVANCES IN COLLOID AND INTERFACE SCIENCE
• 影响因子: 15.6
• 作者: Acharya, Palash V.;Bahadur, Vaibhav
• 通讯作者: Bahadur, Vaibhav

Analytical first-principles-based model for sprays-based CO2 capture

基于第一原理的喷雾二氧化碳捕集分析模型

• DOI: 10.1016/j.ijggc.2023.103969
• 发表时间: 2023
• 期刊: International Journal of Greenhouse Gas Control
• 影响因子: 3.9
• 作者: Bhati, Awan;Bilyaz, Serhat;Bahadur, Vaibhav
• 通讯作者: Bahadur, Vaibhav

Novel Analytical Mass Transfer Model for CO2 Capture using Sprays

使用喷雾捕集二氧化碳的新型分析传质模型

• DOI: 10.2139/ssrn.4282291
• 发表时间: 2022
• 期刊: SSRN Electronic Journal
• 作者: Bhati, Awan;Bilyaz, Serhat;Bahadur, Vaibhav
• 通讯作者: Bahadur, Vaibhav