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GOALI: Pulsed sprays for cooling high power devices

GOALI：用于冷却高功率设备的脉冲喷雾

基本信息

批准号：
2032764
负责人：
Shawn Putnam
金额：
$ 40万
依托单位：
The University of Central Florida Board of Trustees
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-10-01 至 2023-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2032764&HistoricalAwards=false
关键词：
GOALI Pulsed sprays cooling power

项目摘要

The increasing demand for faster and more powerful devices is a ubiquitous trend in science and technology. From high-speed transportation to personal devices to data centers, efficient, cheap thermal management is currently one of the key bottlenecks for advancing the technical envelope. Spray cooling, particularly with boiling-based cooling processes, is expected to play a growing role in the development of new 3D microelectronics, electro-optic devices, and manufacturing processes such as rapid 3D printing. Currently, most devices and large-scale data centers are cooled by a combination of air fans and water cooling channels. However, to meet the heat dissipation demands for the next generation of more powerful and more compact devices and data centers, liquid cooling with the added benefit of phase-change cooling (e.g., boiling and evaporation) is needed. This work pursues the use of pulsed sprays to better understand the fundamental limits of cooling high-power devices with boiling and evaporating fluids. Also, this work will facilitate the collection of systematic fluid flow-field and thermal transport data – both of paramount importance for predicting and understanding phase-change cooling instabilities. The research aims to fully understand the critical heat flux and Leidenfrost effects during pulsed spray cooling. The project has three major research and educational thrusts: (1) Establish refined spray cooling capabilities with moderate area, hemiwicking-textured surfaces/devices and advanced optical metrologies for systematic characterization of spatiotemporal temperature and flow-fields. (2) Understand the thin-film thickness and the instantaneous and time-averaged heat transfer characteristics on structured surfaces with temperatures up to and beyond the Leidenfrost point. (3) Study control allocation methodologies for pulsed, spray/jet cooling with multiple spray nozzles. The application of optimized hemiwicking-structured surfaces adds a transformative niche to this research. Such structures will not only ‘extend’ the liquid-to-solid wetting beyond its intrinsic wetting length in variable gravity environments, but can also reduce droplet splashing, rebound, and entrainment – via using sharp tipped, half-conical (anisotropic) pillars. The project supports many hands-on, educational, and industrial outreach components, facilitating broader impacts from K-12 activities to undergraduate senior design projects to distinctive research for doctoral degrees.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.

对更快、更强大的设备的需求日益增长是科学和技术中普遍存在的趋势。从高速运输到个人设备再到数据中心，高效、廉价的热管理是目前推进技术包络的关键瓶颈之一。喷雾冷却，特别是基于沸腾的冷却工艺，预计将在新的3D微电子，电光器件和快速3D打印等制造工艺的开发中发挥越来越大的作用。目前，大多数设备和大型数据中心都是通过空气风扇和水冷通道的组合来冷却的。然而，为了满足下一代更强大和更紧凑的设备和数据中心的散热需求，具有相变冷却的附加益处的液体冷却（例如，沸腾和蒸发）。这项工作追求使用脉冲喷雾，以更好地了解冷却高功率设备与沸腾和蒸发流体的基本限制。此外，这项工作将有助于收集系统的流体流场和热传输数据-这两个预测和理解相变冷却不稳定性的最重要的。研究目的是充分了解脉冲喷雾冷却过程中的临界热流密度和莱顿弗罗斯特效应。该项目有三个主要的研究和教育重点：（1）建立完善的喷雾冷却能力与适度的面积，半毛细纹理表面/设备和先进的光学计量系统的时空温度和流场的表征。(2)了解温度达到或超过莱顿弗罗斯特点的结构化表面上的薄膜厚度以及瞬时和时间平均传热特性。(3)研究多喷嘴脉冲式喷雾/喷射冷却的控制分配方法。优化的半芯结构表面的应用增加了一个变革性的利基这项研究。这样的结构不仅将在可变重力环境中将液体到固体的润湿“延伸”超过其固有润湿长度，而且还可以通过使用尖锐尖端的半圆锥形（各向异性）柱来减少液滴飞溅、回弹和夹带。该项目支持许多实践、教育和工业外展组成部分，促进从K-12活动到本科高级设计项目到博士学位独特研究的更广泛影响。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。