EAGER: Pool Boiling of Water on a Binary Surface

EAGER：二元表面上水的池沸腾

• 批准号: 1837853
• 负责人: Krishna Kota
• 金额: $ 7万
• 依托单位: New Mexico State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-11-01 至 2020-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1837853&HistoricalAwards=false
• 关键词: EAGER; Pool; Boiling; Water; Binary

Boiling of water to transfer heat has applications in our day-to-day lives, e.g., in power generation, water purification, and cooking. When water boils over a surface, substantial amounts of heat can be transferred from the surface to the water without causing a significant increase in the surface temperature; hence, boiling is also used in applications such as cooling of electronics where large temperature rises are prohibitive. However, when a large amount of heat must be removed from a small area through boiling, it encounters a crisis called the Critical Heat Flux (CHF) limit. At this limit, the rapidly generated vapor bubbles merge to form a vapor film on the hot surface which prevents liquid water to contact the surface. This project pursues a new type of surface, called the Binary Surface(s) (BiS), for extending the current CHF limits for the boiling of water. The underlying science that enables enhanced boiling performance of water on BiS will be shared with the public through YouTube videos.A BiS is a highly wetting surface with many sub-surface micro-/nano-cavities, which are filled with a Non-Boiling Liquid (NBL) creating puddles around solid islands. The goal of this research project is two-fold: (1) to experimentally measure the CHF and the Heat Transfer Coefficient for the pool boiling of water on a copper-oil BiS (oil is the NBL) and compare them with those obtained on hydrophilic and hydrophobic surfaces and (2) to obtain evidence for the hypothesis that heterogeneous bubble nucleation occurs on a BiS. Two tasks are planned to realize this goal and they include pool boiling experiments and BiS surface preparation and analysis before and after the experiments. This project helps to establish the feasibility of a new boiling enhancement mechanism that could have a significant impact in many fields.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.

水沸腾来传递热量在我们的日常生活中有着广泛的应用，例如发电、水净化和烹饪。当水在表面沸腾时，大量的热量可以从表面传递到水中，而不会导致表面温度显着升高；因此，沸腾也被用于诸如电子设备冷却等禁止大幅温升的应用中。然而，当大量的热量必须通过沸腾从小区域中带走时，就会遇到称为临界热通量（CHF）极限的危机。在此极限下，快速产生的蒸汽泡合并，在热表面上形成蒸汽膜，防止液态水接触表面。该项目追求一种新型表面，称为二元表面 (BiS)，用于扩展当前的 CHF 水沸腾限制。增强 BiS 上水的沸腾性能的基础科学将通过 YouTube 视频与公众分享。 BiS 是一种高度润湿的表面，具有许多次表面微/纳米腔，其中充满了非沸腾液体(NBL) 在固体岛屿周围形成水坑。该研究项目的目标有两个：(1) 通过实验测量铜油 BiS（油为 NBL）上水池沸腾的 CHF 和传热系数，并将其与亲水性介质上获得的结果进行比较和疏水表面；(2) 为 BiS 上发生异质气泡成核的假设获得证据。为了实现这一目标，计划开展两项任务，包括池沸腾实验以及实验前后的 BiS 表面制备和分析。该项目有助于建立一种新的沸腾增强机制的可行性，该机制可能在许多领域产生重大影响。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。