Collaborative Research: Scale-free continuum percolation of bubbles as a universal mechanism of the boiling crisis

合作研究：气泡的无标度连续渗透作为沸腾危机的普遍机制

• 批准号: 2019245
• 负责人: Matteo Bucci
• 金额: $ 30万
• 依托单位: Massachusetts Institute of Technology
• 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: 2020-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2019245&HistoricalAwards=false
• 关键词: Collaborative; Research; Scale; free; continuum

Boiling heat transfer is an exceptionally effective heat removal process and plays a critical role in electronics cooling, chemical processing, power generation, HVAC, and water purification. However, boiling is susceptible to a degradation, known as a boiling crisis, which may result in cooling system failures. Understanding this boiling crisis is key to the development and safe operations of nuclear reactors and computer processing units that rely on liquid-vapor two-phase cooling. Despite decades of research, the mechanism triggering a boiling crisis remains unclear and controversial. In this project, a new stochastic model is proposed based on the analogy between the boiling process and the formation of traffic jams. The project seeks to offers a novel perspective of boiling heat transfer to the thermal community. It also provides multidisciplinary STEM training opportunities for graduate and undergraduate students, as well as young researchers.This project will investigate boiling crises as a critical transition in the bubble coalescence process. The instability will be captured with a stochastic percolation model based on four fundamental boiling parameters: bubble wait time and growth time, bubble footprint radius, and nucleation site density. With a critical combination of these four parameters, the boiling crisis occurs when all the bubbles suddenly merge together. This hypothesis has recently been validated on smooth surfaces, in both pool and flow boiling conditions, as well as preliminary results on engineered surfaces. In the proposed work, the universality of the hypothesis will be tested by analyzing the boiling behavior of various surfaces and fluids, at different pressures, and under diverse flow conditions. The project will be accomplished through novel boiling experiments that combine state-of-the-art infrared diagnostics and post-processing algorithms, which enable measurements of time-dependent temperature and heat flux distributions on the boiling surface, as well as other boiling heat transfer parameters. The results of the experimental investigations will be shared with the thermal science and engineering community to support the evaluation of other models and stimulate the development of new ones.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.

沸腾传热是一种非常有效的排热过程，在电子冷却、化学加工、发电、暖通空调和水净化中发挥着关键作用。然而，沸腾容易受到称为沸腾危机的退化的影响，这可能导致冷却系统故障。理解这种沸腾危机是发展和安全运行依赖于液-汽两相冷却的核反应堆和计算机处理单元的关键。尽管经过几十年的研究，引发沸腾危机的机制仍然不清楚，也存在争议。在这个项目中，提出了一个新的随机模型的基础上之间的类比沸腾过程和交通堵塞的形成。该项目旨在提供一个新的视角沸腾传热的热社区。它还为研究生和本科生以及年轻研究人员提供多学科STEM培训机会。该项目将研究沸腾危机作为气泡聚结过程中的关键过渡。将捕获的不稳定性与随机渗流模型的基础上的四个基本沸腾参数：气泡等待时间和生长时间，气泡足迹半径，和成核点密度。在这四个参数的关键组合下，当所有气泡突然合并在一起时，沸腾危机就会发生。这一假设最近在光滑表面上得到了验证，在池和流动沸腾条件下，以及工程表面上的初步结果。在拟议的工作中，假设的普遍性将通过分析各种表面和流体的沸腾行为，在不同的压力下，在不同的流动条件下进行测试。该项目将通过新颖的沸腾实验来完成，该实验结合了联合收割机最先进的红外诊断和后处理算法，从而能够测量沸腾表面上随时间变化的温度和热通量分布以及其他沸腾传热参数。实验研究的结果将与热科学和工程界分享，以支持对其他模型的评估，并刺激新模型的开发。该奖项反映了NSF的法定使命，并被认为值得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来支持。

项目成果

Decrypting the boiling crisis through data-driven exploration of high-resolution infrared thermometry measurements

通过数据驱动的高分辨率红外测温测量探索来解密沸腾危机

• DOI: 10.1063/5.0048391
• 发表时间: 2021
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Ravichandran, Madhumitha;Su, Guanyu;Wang, Chi;Seong, Jee Hyun;Kossolapov, Artyom;Phillips, Bren;Rahman, Md Mahamudur;Bucci, Matteo
• 通讯作者: Bucci, Matteo

Investigation of critical heat flux enhancement on nanoengineered surfaces in pressurized subcooled flow boiling using infrared thermometry

• DOI: 10.1080/01457632.2023.2191441
• 发表时间: 2023-03
• 期刊: Heat Transfer Engineering
• 影响因子: 2.3
• 作者: Chia-Yun Wang;G. Su;Olorunsola Akinsulire;Limiao Zhang;Md Mahamudur Rahman;M. Bucci

Decrypting the mechanisms of wicking and evaporation heat transfer on micro-pillars during the pool boiling of water using high-resolution infrared thermometry

使用高分辨率红外测温法解密水池沸腾期间微柱上的芯吸和蒸发传热机制

• DOI: 10.1063/5.0135110
• 发表时间: 2023
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: Wang, Chi;Rahman, Md Mahamudur;Bucci, Matteo
• 通讯作者: Bucci, Matteo