Collaborative Research: Thermally Actuated Pumping Mechanism During Boiling on an Asymmetrically Structured Surface

合作研究：不对称结构表面沸腾过程中的热驱动泵送机制

• 批准号: 0854503
• 负责人: Vinod Narayanan
• 金额: $ 10.11万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0854503&HistoricalAwards=false
• 关键词: Collaborative; Research; Thermally; Actuated; Pumping

0854503NarayananThis is a collaborative research and educational program between investigators at Oregon State University and Auburn University in the general area of phase-change heat transfer enhancement. The research goal is to characterize the effect of a passively imposed asymmetric force on a bubble during the boiling process. Such asymmetry is created by the use of a surface with repeated ratchet structures and pyramidal reentrant cavities located on one of its sides. The hypothesis is that with several ratchets, this local asymmetric motion can be translated to a net fluid pumping. Educational activities aim to provide a synergy between research and education, as well as between several universities.The main objectives of the project are to: (1) Determine, using a suite of non-intrusive imaging methods, time-varying bubble diameters and frequencies, liquid and bubble velocities, and temporally- and spatially- resolved surface temperatures, (2) Refine preliminary models based on information obtained from the above imaging experiments, (3) Validate the model against global measurements of a large-array of ratchets, for which boiling curves will be established, and (4) Integrate research findings into a new module in an existing multi-University Electronics Thermal Management course.Intellectual Merit: The enhancement technique can be applied to heat transfer from adversely oriented surfaces and in space thermal management. The proposed methods of experimentation present a detailed estimation of flow and temperature field in boiling flows that will be useful to modellers. The proposed analyses will highlight forces of importance by performing experiments under different orientations and subcooling levels, and with two fluids of contrasting properties. Passive methods of heat transfer enhancement are important in a broader context of energy efficiency.Broader Impact: Educational activities will include integration of the project results in the form of a module into an existing, past-NSF funded Electronics Thermal Management live-internet multi-campus course and will incorporate Oregon State University as a new partner. At the end of year 2, a DC-9 microgravity flight experiment is planned as a part of a concurrent grant from NASA. Several senior undergraduate students will take part in the design and eventual testing of this experiment. An AT&T-Minority-Engineering-Program student at Auburn University will also be working closely with OSU undergraduate students. One promising high-school student, through the Oregon-state-wide Apprenticeship in Science and Engineering Program, will be involved in experiment design and testing.

这是俄勒冈州州立大学和奥本大学在相变传热增强的一般领域的研究人员之间的合作研究和教育计划。研究目标是描述在沸腾过程中，被动施加的非对称力对气泡的影响。这种不对称性是通过使用具有重复的棘轮结构和位于其一侧上的金字塔形凹腔的表面来产生的。假设是，通过几个棘轮，这种局部不对称运动可以转化为净流体泵送。教育活动旨在促进研究与教育之间以及几所大学之间的协同作用，该项目的主要目标是：（1）使用一套非侵入式成像方法确定随时间变化的气泡直径和频率、液体和气泡速度以及时间和空间分辨的表面温度，（2）根据从上述成像实验中获得的信息改进初步模型，（3）将模型与大规模棘轮阵列的全球测量结果进行比较，将建立其沸腾曲线，（4）将研究成果整合到现有多所大学电子热管理课程的一个新模块中。智力优势：增强技术可应用于反向表面的传热和空间热管理。所提出的实验方法提出了一个详细的估计流动和温度场的沸腾流动，这将是有用的建模。建议的分析将突出的力量的重要性，通过在不同的方向和过冷水平下进行实验，并与两种流体的对比性能。更广泛的影响：教育活动将包括将项目成果以模块的形式整合到现有的、过去由NSF资助的电子热管理实时互联网多校区课程中，并将俄勒冈州州立大学作为新的合作伙伴。在第二年年底，计划进行DC-9微重力飞行实验，作为美国航天局同时提供的赠款的一部分。几个高年级的本科生将参与设计和最终测试这个实验。奥本大学的一名AT T少数民族工程项目学生也将与俄勒冈州立大学的本科生密切合作。&一个有前途的高中生，通过俄勒冈州范围内的科学和工程学徒计划，将参与实验设计和测试。