REU Supplement: Small Grants for Exploratory Research: EHDHeat Transfer Augmentation of Environmentally Safe Refrigerants

REU 补充材料：探索性研究的小额资助：环境安全制冷剂的 EHD 传热增强

• 批准号: 9117068
• 负责人: Michael Ohadi
• 金额: $ 4.51万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-15 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117068&HistoricalAwards=false
• 关键词: REU; Supplement; Small; Grants; Exploratory

Results of research in the past decade clearly suggest an excellent potential for electrohydrodynamic (EHD) technique in heat transfer augmentation of organic media with low-electrical conductivity. Many of the newly identified refrigerants have poor heat transfer characteristics, but appear to have a low enough electrical conductivity to qualify for the EHD enhancement. An exploratory experimental research effort is proposed to investigate the effectiveness/applicability of EHD heat transfer augmentation of three environmentally acceptable (Ozone-safe) refrigerants. The selected refrigerants are R-22, R-123 and R-134a, which are believed to most likely represent the core of future non-azeotropic working fluids for residential/commercial air conditioning and heat pumping systems. The potential of EHD boiling heat transfer augmentation of these refrigerants will be studied as a function of electric field parameters (applied voltage and electrode geometry/orientation) and heat transfer surface characteristics (smooth and enhanced configurations). Should results of this initial investigation be encouraging, a more comprehensive future proposal will be submitted whereby systematic study of the problem both experimentally and analytically can be conducted.

近十年来的研究结果清楚地表明，电流体力学技术在低导电性有机介质增热方面具有良好的潜力。许多新发现的制冷剂具有较差的传热特性，但似乎具有足够低的电导率，以符合EHD增强的要求。提出了一项探索性的实验研究工作，以调查三种环境可接受（臭氧安全）制冷剂的EHD传热增强的有效性/适用性。所选择的制冷剂是R-22， R-123和R-134a，它们被认为最有可能代表未来住宅/商业空调和热泵系统的非共沸工作流体的核心。这些制冷剂的EHD沸腾传热增强潜力将作为电场参数（施加电压和电极几何/方向）和传热表面特性（光滑和增强配置）的函数进行研究。如果初步调查的结果令人鼓舞，今后将提出一项更全面的建议，从而对该问题进行系统的实验和分析研究。