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加热方位对流动沸腾临界热流密度影响
李冈, 宋保银, 张钊, 罗祖分
0
(南京航空航天大学航空宇航学院)
摘要:
为了研究重力场对流动沸腾临界热流密度的影响,搭建了两相沸腾换热实验系统。以蒸馏水为工质,采用单侧加热的窄缝通道,通过改变质量流速、入口过冷度和重力场与加热方位的夹角,考察不同加热方位临界热流密度特性和试验段流阻特性。分析了质量流速、入口过冷度、加热方位对流动沸腾临界热流密度的影响,并将实验数据与Ivey-Morris模型、Sudo模型和Wojtan模型的计算值进行了验证对比。结果表明加热面呈0°放置时的临界热流密度最大,呈180°放置时最小,质量流速和入口过冷度的增大会加大临界热流密度。Sudo模型对本实验条件不适用;Ivey-Morris模型和Wojtan模型在加热面呈0°放置时与实验值符合情况良好,相对误差约在30%以内,其他加热方位时,计算值均大于实验值。
关键词:  流动沸腾  临界热流密度  加热方位  窄缝通道  经验关系式
DOI:
    
基金项目:国家自然科学基金(50576035)和高等学校博士学科点专项科研基金项目(20040287017)资助项目。
Effect of Heating Orientation on the Critical Heat Flux of Flow Boiling
Li Gang, Song Baoyin, Zhang Zhao, Luo Zufen
(College of Aerospace Engineering, Nanjing University of Aeronautics and Aeronautics)
Abstract:
In order to research the effect of the gravity on the critical heat flux of flow boiling, a two-phase boiling heat transfer test system was established. Using distilled water as the working fluid medium, the characteristics of fluid critical heat flux and flow resistance in narrow channel under different heating orientations were investigated through changing mass velocity, inlet subcooling and heating orientation. Their effects on the critical heat flux of flow boiling were analyzed. The results show that the maximum critical heat flux appears at the orientation angel of 0° and the minimum at 180°. The increases of mass velocity and inlet subcooling will increase the critical heat flux. The experimental data were compared with the calculated values based on the correlations of Ivey-Morris, Sudo and Wojtan, respectively, which shows that Sudo correlation was not suitable to the present experiment conditions. The predicting values with Ivey-Morris correlation and Wojtan correlation agree well with the experimental data as the orientation angel is at 0°, and the relative deviation is within 30%. However the predicting values are greater than the experimental data under other orientations.
Key words:  flow boiling  critical heat flux  heating orientation  narrow channel  empiric correlation

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