An experimental investigation on bubbles departure characteristics during sub-cooled flow boiling in a vertical U-shaped channel utilizing high-speed photography

被引:22
作者
Holagh, Shahriyar Ghazanfari [1 ]
Abdous, Mohammad Ali [1 ]
Roy, Prosun [2 ]
Shamsaiee, Masood [1 ]
Shafiee, Mahmood [3 ]
Saffari, Hamid [1 ]
Valino, Luis [4 ]
Andersson, Ronnie [5 ]
机构
[1] Iran Univ Sci & Technol, Sch Mech Engn, Tehran, Iran
[2] Univ Wisconsin, Dept Mech Engn, Milwaukee, WI 53201 USA
[3] Univ Kent, Sch Engn & Digital Arts, Mech Engn Grp, Canterbury CT2 7NT, Kent, England
[4] Lab Invest Fluidodinam & Tecnol Combust LIFTEC, Zaragoza, Spain
[5] Chalmers Univ Technol, Dept Chem & Chem Engn, Gothenburg, Sweden
关键词
Subcooled flow boiling; U-shaped channel; Departure diameter; Nucleation frequency; Growth time; Waiting time; LIFT-OFF DIAMETER; HEAT-FLUX; GROWTH-RATE; PREDICTION; MODEL; FREQUENCY; WATER; WALL; DETACHMENT; PRESSURES;
D O I
10.1016/j.tsep.2020.100828
中图分类号
O414.1 [热力学];
学科分类号
摘要
Classified as a passive heat transfer enhancement technique, U-shaped channels are commonly encountered with applications associated with boiling heat transfer such as air conditioning systems, evaporators, and boilers. On the other hand, understanding heat transfer in flow boiling is heavily dependent upon bubbles dynamic behavior, which is influenced by flow and geometrical conditions. In this paper, bubbles departure characteristics are experimentally studied in upward sub-cooled flow boiling of distilled water in a vertical U-shaped channel. The influence of flow conditions, embracing heat flux, mass flux, and inlet sub-cooling on bubbles characteristics, encompassing departure diameter, growth and waiting times, and nucleation frequency, is investigated through conducting 68 experiments. All the experiments are carried out at atmospheric pressure over a Nichrome heating surface installed on the outer wall of the channel, with heat flux, mass flux, and inlet flow temperature in the ranges of 26.1-61.5 kW.m(-2), 114-255kg.m(-2)s(-1), and 1 to 8 degrees C. A high-speed camera is utilized to capture bubbles growth process and departure instance. The results reveal that as wall heat flux increases and mass flux and inlet sub-cooling decrease, bubbles departure diameter and frequency rise, while waiting time declines. Also, lower growth times are detected when wall heat flux and mass flux increase and inlet sub-cooling declines. Two new correlations are developed to predict present and previously published experimental data of departure diameter and nucleation frequency with mean standard deviations of 18.0% and 18.5%, correspondingly.
引用
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页数:19
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