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- W4309322234 abstract "超临界传热已进行了广泛研究, 但对其现象及机理的认识仍不充分, 本文研究了超临界二氧化碳(supercritical, sCO2)池式传热. 实验以长度为22 mm和直径为70 μm铂丝为加热和测温元件, 压力容器压力为 (8~10) MPa, 加热丝热流密度范围为0~1800 kW/m2, 显著高于文献中的参数范围. 采用变物性层流模型进行流固耦合数值模拟, 加热丝附近采用了多尺度网格技术, 数值模拟与实验结果吻合良好. 发现传热系数h随热流密度qw的变化呈S型曲线，将h~qw曲线划分成三个区域. 在类临界温度前, 因瑞利数Ra随qw增大而增大, h随qw增大而增大; 当铂丝温度开始超过类临界温度后, 由于超临界流体回流效应增强，h继续增大直到获得最大值. 随后, 由于近壁区类气膜热阻增大, h随qw增大而减小直到获得极小值. 在超过h极小值点后, 由于高温下超临界流体导热系数随温度增大而增大, 随qw增大h回复到增大趋势. 本文获得了全参数范围内传热系数与热流密度的关系曲线, 获得了对超临界池式传热较为完整的理解." @default.
- W4309322234 created "2022-11-26" @default.
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- W4309322234 date "2023-06-01" @default.
- W4309322234 modified "2023-10-16" @default.
- W4309322234 title "Experiment and numerical simulation of supercritical CO<sub>2</sub> pool heat transfer" @default.
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- W4309322234 doi "https://doi.org/10.1360/sst-2022-0325" @default.
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