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赵亮(), 张梦妍, 果正龙, 郭亚丽, 龚路远(), 沈胜强
收稿日期:
2024-05-26
修回日期:
2024-06-26
出版日期:
2024-07-19
通讯作者:
龚路远
作者简介:
赵亮(1979—),男,博士,副教授,zlhmf@dlut.edu.cn
基金资助:
Liang ZHAO(), Mengyan ZHANG, Zhenglong GUO, Yali GUO, Luyuan GONG(), Shengqiang SHEN
Received:
2024-05-26
Revised:
2024-06-26
Online:
2024-07-19
Contact:
Luyuan GONG
摘要:
作为一种高效的传热形式,蒸汽冷凝被有效地应用于石油化工、火电核电、海水淡化及热能管理等工业领域,具有广泛的应用背景。其中,研究液滴分布特性是分析液滴演变及传热过程的关键。本文基于成核、生长、脱落等液滴行为演变,构建了滴状冷凝全过程演变及传热数学模型,总结了演变进程中液滴最大液滴的位置分布规律和不同尺寸液滴的数量分布规律,展示了竖直及弯曲疏水壁面上的液滴分布特性,为冷凝强化换热提供相应的理论依据。
中图分类号:
赵亮, 张梦妍, 果正龙, 郭亚丽, 龚路远, 沈胜强. 滴状冷凝的液滴分布特性研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240552.
Liang ZHAO, Mengyan ZHANG, Zhenglong GUO, Yali GUO, Luyuan GONG, Shengqiang SHEN. Study on droplet distribution characteristics of dropwise condensation[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240552.
冷凝工况及表面性质 | 数值 |
---|---|
表面过冷度ΔT/K | 1 |
水蒸气饱和温度Tsat/K | 359.08 |
表面张力系数σ/N.m-1 | 0.0616 |
冷凝水密度ρ/kg.m-3 | 968 |
冷凝水潜热Hfg/J.kg-1 | 2.293×106 |
疏水涂层厚度δ/mm | 0.01 |
水热导率kw/ W.m-1.K-1 | 0.6707 |
气液界面传热系数hi/ W.m-2.K-1 | 106 |
疏水膜热导率kδ/ W.m-1.K-1 | 1000 |
表1 模拟的基础参数
Table 1 Basic parameters of simulation
冷凝工况及表面性质 | 数值 |
---|---|
表面过冷度ΔT/K | 1 |
水蒸气饱和温度Tsat/K | 359.08 |
表面张力系数σ/N.m-1 | 0.0616 |
冷凝水密度ρ/kg.m-3 | 968 |
冷凝水潜热Hfg/J.kg-1 | 2.293×106 |
疏水涂层厚度δ/mm | 0.01 |
水热导率kw/ W.m-1.K-1 | 0.6707 |
气液界面传热系数hi/ W.m-2.K-1 | 106 |
疏水膜热导率kδ/ W.m-1.K-1 | 1000 |
图7 不同凝结核密度滴状冷凝演变进程中的最大液滴位置分布(a)及坐标变化(b)
Fig. 7 The maximum droplet positional distribution during the evolution of dropwise condensation with different condensation nuclei densities (a) and coordinate change (b)
图9 不同凝结核密度滴状冷凝演变进程中的不同尺寸液滴密度对比
Fig. 9 Density comparison of sub-size droplets in the evolution process of dropwise condensation with different condensation nuclei density
图11 不同壁面滴状冷凝演变进程中最大液滴的空间分布、尺寸变化和传热特性
Fig. 11 Spatial distribution, size change and heat transfer characteristics of the largest droplet during the evolution of dropwise condensation on different walls
图12 不同壁面上滴状冷凝演变进程中的最大液滴位置坐标变化
Fig. 12 Coordinate change of the maximum droplet position during the evolution of dropwise condensation on different walls
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