Enhancement Mechanism in the Nucleate Boiling and Convective Vaporization of Liquids on Microconfigured Surfaces

微构表面液体核沸腾和对流汽化的增强机制

• 批准号: 9119829
• 负责人: Benjamin Gebhart
• 金额: --
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119829&HistoricalAwards=false
• 关键词: Enhancement; Mechanism; Nucleate; Boiling; Convective

Boiling is one of the most important and complex heat transfer mechanisms. Recent focus on heat dissipation problems for submicron electronic circuits brings new motivation for better understanding of boiling. This project concerns studies of direct phase change and nucleation processes on microconfigured silicon substrates. Recent studies by the PI employing 11.5 >m features at a density range of 0.4 - 2 (10)5 per cm2 showed a 350% boiling enhancement in water and the elimination of hysterias and overshoot in FC-72. Future studies include effects of microfeature spacing, geometry and surface treatments, development of a more realistic model, micro-second level visualization, and the measurement of temperature fluctuations. Subcooled boiling measurements will also be made.

沸腾是最重要和最复杂的传热机制之一。 最近对亚微米电子电路散热问题的关注为更好地理解沸腾带来了新的动力。 该项目涉及微配置硅基板上的直接相变和成核过程的研究。 PI 最近的研究表明，在密度范围为 0.4 - 2 (10)5/cm2 时采用 11.5 >m 特征，水的沸腾增强了 350%，并且消除了 FC-72 中的歇斯底里和过冲。 未来的研究包括微观特征间距、几何形状和表面处理的影响、开发更真实的模型、微秒级可视化以及温度波动的测量。 还将进行过冷沸腾测量。