CAREER: Tuning liquid jet and splash dynamics by deformable and heterogeneous boundaries

职业：通过可变形和异质边界调整液体射流和飞溅动力学

• 批准号: 1941341
• 负责人: Andrew Dickerson
• 金额: $ 50万
• 依托单位: The University of Central Florida Board of Trustees
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-01-01 至 2021-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1941341&HistoricalAwards=false
• 关键词: CAREER; Tuning; liquid; jet; splash

The stability of liquids flowing through gas is relevant to drug delivery, fabrication processes, and thermal management. The stability depends on the properties of the flowing fluid and on the mechanical and surface properties of the solid bodies in the system. To better understand the stability of liquid flow in these systems, this project will study how the properties of solid bodies affect both free liquid jets and water entry splashes. Specifically, this research will introduce (i) soft materials that deform in response to fluid motion, and (ii) spatially nonuniform solid wetting properties where the air, liquid, and solid phases meet. The feature of greatest interest in jets is the length at which the coherent liquid column disintegrates into drops. Here, this length will be controlled by employing deformable nozzles and nonuniform surface chemistry (i.e. wetting properties) at the orifice. In studying water entry, a solid impactor splashes into a liquid pool, and the resulting dispersed liquid and air-entraining cavity behavior are of interest. Such splash features will be modified using both solid projectiles with chemically nonuniform surfaces and via compliant solid films atop the liquid surface. These scientific endeavors integrate educational activities that engage local high school students and educators in the scientific process through lectures, classroom flow control experiments, mentored science fair projects, and research engagement workshops for teachers.The characterization of the coupled physics of dynamic three-phase contact lines with soft solids is in its infancy. This research effort seeks to explore fluid flows where the multiphase interface has been modified via material compliance and surface treatments. Experiments and theory will be used to understand the physics of jet stability with the inclusion of the aforementioned passive flow modifiers. A new understanding of initial disturbances and their suppression within free stream liquid jets will inform the adaptation of linear jet stability theory for deformable nozzles. The modification of free liquid surfaces with compliant media and the alteration of solid projectiles with heterogeneous boundaries will produce new theoretical treatments at moderate Weber numbers for vehicles entering water. Thus, conditions for cavity creation and collapse will be redefined, and the limits of lift force production from non-axisymmetric cavities will be explored. Experimental techniques include high-speed videography to capture flow features, digital tracking to elucidate kinematics, microscopy to image surfaces, and X-ray photoelectron spectroscopy to chemically characterize the solid surfaces used in this study.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.

流过气体的液体的稳定性与药物输送，制造过程和热管理有关。稳定性取决于流体流体的特性以及系统中固体的机械和表面特性。 为了更好地了解这些系统中液体流的稳定性，该项目将研究固体的性质如何影响游离液体喷气机和水入口。具体而言，这项研究将引入（i）响应流体运动而变形的软材料，以及（ii）空气，液体和固体相处的空间不均匀的固体润湿性能。对喷气机的最大兴趣的特征是连贯的液体柱分解成滴的长度。在这里，该长度将通过使用可变形的喷嘴和孔口的不均匀表面化学（即润湿特性）来控制。在研究水分的过程中，固体撞击器会溅入液体池中，并且产生的分散液体和灌输空腔的行为引起了人们的关注。这种飞溅特征将使用具有化学不均匀表面的固体弹丸和液体表面上的符合性固体膜进行修饰。这些科学的努力整合了教育活动，这些活动通过讲座，课堂流控制实验，指导的科学公平项目以及针对教师的研究参与讲习班与当地高中生和教育工作者进行科学过程。这项研究工作旨在探索多相界面通过材料依从​​性和表面处理修改的流体流。实验和理论将通过包含上述被动流动修饰符来理解喷气稳定性的物理。对初始干扰及其在自由流液体喷气机中的抑制作用的新理解将为可变形喷嘴的线性喷射稳定理论的适应。通过合规培养基修改游离液体表面，并改变具有异质界限的固体弹丸将在中等韦伯的车辆中产生新的理论处理。因此，将重新定义产生腔和塌陷的条件，并将探索非轴对称腔的升力产生限制。实验技术包括高速摄影，以捕获流量功能，数字跟踪以阐明运动学，显微镜图像表面以及X射线光电子光谱镜检查，以化学表征本研究中使用的固体表面。该奖项奖反映了NSF的法定任务，并通过评估智能委员会进行了评估。

项目成果

Water entry dynamics of spheres with heterogeneous wetting properties

• DOI: 10.1103/physrevfluids.6.044003
• 发表时间: 2021-04
• 作者: D. Watson;Joshua M. Bom;Madison P. Weinberg;Chris J. Souchik;Andrew K. Dickerson

Drop impact onto pine needle fibers with non-circular cross section

• DOI: 10.1063/5.0019310
• 发表时间: 2020-09
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: Amy P. Lebanoff;Andrew K. Dickerson

Predictive modelling of drop ejection from damped, dampened wings by machine learning

通过机器学习对阻尼、阻尼机翼喷射液滴进行预测建模

• DOI: 10.1098/rspa.2020.0467
• 发表时间: 2020
• 期刊: Physical and Engineering Sciences
• 作者: Alam, MD Erfanul;Wu, Dazhong;Dickerson, Andrew K.
• 通讯作者: Dickerson, Andrew K.

Sessile liquid drops damp vibrating structures

• DOI: 10.1063/5.0055382
• 发表时间: 2021-06-01
• 期刊: PHYSICS OF FLUIDS
• 影响因子: 4.6
• 作者: Alam, Md Erfanul;Dickerson, Andrew K.
• 通讯作者: Dickerson, Andrew K.

Ensemble machine learning predicts displacement of cantilevered fibers impacted by falling drops

集成机器学习预测悬臂纤维受落滴影响的位移

• DOI: 10.1016/j.jfluidstructs.2021.103253
• 发表时间: 2021
• 期刊: Journal of Fluids and Structures
• 影响因子: 3.6
• 作者: Orkweha, Panporn;Downing, Alexis;Lebanoff, Amy P.;Zehtabian, Sharare;Bacanli, S. Safa;Turgut, Damla;Dickerson, Andrew K.
• 通讯作者: Dickerson, Andrew K.