Interaction of multiphase fluids and solids at the microscale

微尺度多相流体和固体的相互作用

• 批准号: 2012242
• 负责人: Hector Gomez
• 金额: $ 30万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-05-15 至 2025-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2012242&HistoricalAwards=false
• 关键词: Interaction; multiphase; fluids; solids; microscale

Multiphase flows are important in a wide variety of processes in science, engineering and medicine. In most cases of practical interest, multiphase flows interact mechanically with deformable solids. Fluid-solid interactions have been widely studied for macroscale problems, where the effect of surface tension is negligible. However, due to the continuous miniaturization of manufactured objects and the importance of surface tension in natural phenomena, there is a critical need to better understand fluid-solid interactions where surface tension plays a predominant role. Using a unique and enabling computational method, this project will unravel the fundamental mechanisms of fluid-solid interactions that couple flow, nonlinear elasticity and surface tension. The proposed research will shed light on the process of spontaneous droplet motion on soft substrates, interfacial instabilities in soft capillary tubes, and pool boiling on deformable solid surfaces. The understanding of these phenomena may bring major advances in bioinspired droplet motion, microfluidics and multiphase heat transfer. The research will be integrated in the curriculum through an initiative to introduce simple concepts of fluid-structure interaction in undergraduate mechanical engineering courses. The project will also offer undergraduate summer research experiences and mentoring activities. The goal of this project is to understand fluid-solid interactions where surface tension interacts with flow, fluid-fluid phase transformations and elastic forces. These phenomena, ubiquitous in microfluidics, medicine, and natural phenomena, have not been previously studied partially due to our lack of theoretical and computational tools. This knowledge gap is limiting our progress on multiphase heat transfer, microfluidics, biofluids and microfabrication, among other science and engineering applications. The current project will leverage a unique computational approach to unveil the fundamental mechanisms controlling this fascinating coupled problem. The project will focus on fundamental scientific problems involving (i) the displacement of a fluid by another fluid in a soft capillary tube, (ii) the spontaneous motion of droplets on soft substrates, and (iii) the effect of deformable substrates on temperature-driven liquid-vapor phase transformations.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.

多相流在科学、工程和医学的各种过程中都很重要。在大多数有实际意义的情况下，多相流与可变形固体机械地相互作用。流固相互作用已被广泛用于研究宏观尺度的问题，其中表面张力的影响可以忽略不计。然而，由于人造物体的不断小型化和表面张力在自然现象中的重要性，迫切需要更好地了解流固相互作用，其中表面张力起主导作用。使用一种独特且可行的计算方法，该项目将解开流体-固体相互作用的基本机制，这些机制耦合了流动、非线性弹性和表面张力。所提出的研究将有助于揭示液滴在软基上的自发运动过程、软毛细管中的界面不稳定性以及可变形固体表面上的池沸腾。对这些现象的理解可能会在生物诱导的液滴运动、微流体和多相传热学方面带来重大进展。这项研究将通过在本科机械工程课程中引入流体-结构相互作用的简单概念来整合到课程中。该项目还将为本科生提供暑期研究体验和辅导活动。这个项目的目标是了解流体-固体相互作用，其中表面张力与流动、流体-流体相变和弹性力相互作用。这些现象普遍存在于微流体、医学和自然现象中，由于缺乏理论和计算工具，以前没有进行过研究。这一知识差距限制了我们在多相传热学、微流体、生物流体和微制造以及其他科学和工程应用方面的进展。目前的项目将利用一种独特的计算方法来揭示控制这个令人着迷的耦合问题的基本机制。该项目将专注于基本的科学问题，涉及(I)软毛细管中另一种流体的置换，(Ii)软衬底上液滴的自发运动，以及(Iii)可变形衬底对温度驱动的液-气相变的影响。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Elasto-capillary fluid–structure interaction with compound droplets

• DOI: 10.1016/j.cma.2022.115507
• 发表时间: 2022-10
• 期刊: Computer Methods in Applied Mechanics and Engineering
• 影响因子: 7.2
• 作者: Sthavishtha R. Bhopalam;J. Bueno;Héctor Mauricio Serna-Gómez