摘要
根据Marangoni凝结实验图片,通过分析不同浓度和过冷度下凝结液珠在不同半径区间的比例分布,发现凝结液珠半径数目比例的最大值都是集中在0.15 mm和0.2 mm之间,研究了各浓度传热系数达到峰值时的凝结液珠尺寸分布规律.从统计数据来看,浓度对液珠尺寸分布影响不大,而流速对液珠的尺寸分布影响很大,当流速增大,液珠变得更多、更密.对Le Fever提出的液珠尺寸分布公式进行了流速修正,修正后的公式与实验数据的一致性较好,最大误差为23%.
Number size distribution in different radius range was analyzed under different concentration and vapor-to-surface temperature difference, the maximum value of radius number of condensation drop was within the range of 0.15mm and 0.2ram, the number-average radius decreased with decreasing vapor- to-surface temperature difference. The vapor-to-surface temperature difference, which corresponded to the peak of number variance, approximated to the vapor-to-surface temperature difference of the maximum heat transfer coefficient in condensation characteristic curve. Size distribution of condensate drops was studied when heat transfer coefficient reached peak value for each concentration. Statistical data showed that the vapor velocity to effect of size distribution was considerably greater than concentration. The condensate drops became smaller and denser with increasing velocity. Velocity correction was preceded to size distribution equation presented by Le Fever, the modified one was consistent with statistical data, and the maximum error was 23%.
出处
《新疆大学学报（自然科学版）》
CAS
2012年第4期492-496,共5页
Journal of Xinjiang University(Natural Science Edition)
基金
国家自然科学基金(50966003)
教育部科学技术研究重点资助项目(211197)
新疆大学博士启动基金(BS090147)
关键词
混合蒸气
MARANGONI凝结
半径分布
Ethanol-water vapor mixtures
Marangoni condensation
Radius distribution
