Investigation of Binary Mixture Flow Boiling in Micro-Scale Structures

微尺度结构中二元混合流沸腾的研究

• 批准号: 1034242
• 负责人: Weilin Qu
• 金额: $ 30万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1034242&HistoricalAwards=false
• 关键词: Investigation; Binary; Mixture; Flow; Boiling

1034242QuThis investigation involves flow boiling of non-azeotropic and azeotropic binary mixtures in two types of micro-scale heat transfer enhancement structures, namely micro-channels and micro-pin fin arrays. Forced convection boiling of binary mixtures in channels of conventional size, as well as flow boiling of pure fluids in micro-scale structures has been studied extensively. However, forced convection boiling of binary mixtures in micro-scale structures remains largely unexplored. Intellectual Merit: An experimental approach will be taken to investigate and quantify heat transfer rates, two-phase pressure drops, critical heat fluxes, and flow instabilities in situations involving forced convection boiling of binary mixtures in small channels. The influence of mixture composition and microstructure geometry on the boiling process will be explored, and accurate modeling tools will be developed. Possible heat transfer degradation associated with forced convection boiling of mixtures in micro-scale structures will be examined and the mechanisms leading to degradation will be identified. Broader Impacts: The research will impact a number of technologies, including but not limited to use of miniaturized heat sinks for high-heat-flux cooling applications, as well as the design of miniature chemical reactors. The project will expose graduate, undergraduate, and high school students to micro-scale flow boiling transport processes through integrated teaching, research, and outreach activities. Existing institutional programs that target involvement of underrepresented groups will also be utilized.

1034242Qu 这项研究涉及两种微尺度传热增强结构（即微通道和微针翅片阵列）中非共沸和共沸二元混合物的流动沸腾。 常规尺寸通道中二元混合物的强制对流沸腾以及微尺度结构中纯流体的流动沸腾已得到广泛研究。然而，微尺度结构中二元混合物的强制对流沸腾在很大程度上仍未被探索。智力优点：将采用实验方法来研究和量化小通道中二元混合物强制对流沸腾情况下的传热速率、两相压降、临界热通量和流动不稳定性。将探索混合物成分和微观结构几何形状对沸腾过程的影响，并开发精确的建模工具。将检查与微尺度结构中的混合物的强制对流沸腾相关的可能的传热退化，并确定导致退化的机制。更广泛的影响：该研究将影响许多技术，包括但不限于用于高热通量冷却应用的微型散热器的使用，以及微型化学反应器的设计。该项目将通过综合教学、研究和推广活动，让研究生、本科生和高中生了解微尺度流动沸腾传输过程。还将利用针对代表性不足群体参与的现有机构计划。