微纳结构超疏水表面参数影响含不凝气蒸汽冷凝传热的理论分析

doi:10.11949/0438-1157.20201380

摘要/Abstract

摘要：

超疏水表面结构参数对滴状冷凝传热性能、液滴生长和分布均会产生影响。首先利用竖直壁面液滴的受力平衡确定了不凝气条件下蒸汽冷凝过程中液滴的脱落半径，随后建立了含不凝气蒸汽滴状冷凝的传热模型，研究了不同不凝气浓度和过冷度下超疏水表面微柱的柱间距对滴状冷凝传热性能的影响，得到了使超疏水表面冷凝传热性能达到最佳的柱间距值，并对其随不凝气浓度和过冷度的变化规律进行了分析。结果表明在所研究的过冷度范围内，当不凝气浓度较低时（<20%），最佳柱间距随不凝气浓度升高而增大；而当不凝气浓度高于20%时，最佳柱间距随不凝气浓度升高而减小。为驱动含不凝气蒸汽冷凝传热性能的超疏水微纳结构参数的优化提供了必要的基础数据。

关键词: 凝结, 超疏水, 表面, 不凝气, 传热, 微尺度

Abstract:

The super-hydrophobic surface structure parameters will affect the droplet condensation heat transfer performance, droplet growth and distribution. The departure radius of droplets on the vertical wall during steam condensation with non-condensable gas was determined by the force balance, and a heat transfer model for dropwise condensation with non-condensable gas was developed. The influence of the space between the micro-pillars on superhydrophobic surface on dropwise condensation heat transfer performance was conducted under various non-condensable gas concentrations and surface subcoolings. The optimum value of the micro-pillars spacing which can induce the maximum dropwise condensation heat transfer performance was developed. Furthermore, the effects of non-condensable gas concentration and surface subcooling on the optimum micro-pillars spacing were analyzed. The results illustrated that the optimum micro-pillars spacing ascended with the increase of the non-condensable gas concentration when the concentration of non-condensable gas was lower than 20%. However, the optimum micro-pillars spacing decreased with the increase of the non-condensable gas concentration when the non-condensable gas concentration was higher than 20% within the applied surface subcooling. The results supplied the primary information for optimizing the micro-nano structures of superhydrophobic surfaces which can induce the condensation heat transfer enhancement of steam in the presence of non-condensable gas.

Key words: condensation, superhydrophobic, surface, non-condensable gas, heat transfer, micro scale

中图分类号:

TK 124

贺征宇, 彭本利, 苏风民, 纪玉龙, 马鸿斌. 微纳结构超疏水表面参数影响含不凝气蒸汽冷凝传热的理论分析[J]. 化工学报, 2021, 72(5): 2570-2577.

HE Zhengyu, PENG Benli, SU Fengmin, JI Yulong, MA Hongbin. Theoretical analysis on the effect of micro-nano structured superhydrophobic surface parameters on dropwise condensation with non-condensable gas[J]. CIESC Journal, 2021, 72(5): 2570-2577.

图/表 3

参考文献 37

1	Rose J W. Dropwise condensation theory and experiment: a review[J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2002, 216(2): 115-128.
2	Ma X H, Rose J W, Xu D Q, et al. Advances in dropwise condensation heat transfer: Chinese research[J]. Chemical Engineering Journal, 2000, 78(2/3): 87-93.
3	Egab K, Alwazzan M, Peng B L, et al. Enhancing filmwise and dropwise condensation using a hybrid wettability contrast mechanism: circular patterns[J]. International Journal of Heat and Mass Transfer, 2020, 154: 119640.
4	Xie J, Xu J L, Li X, et al. Dropwise condensation on superhydrophobic nanostructure surface(Ⅰ): Long-term operation and nanostructure failure[J]. International Journal of Heat and Mass Transfer, 2019, 129: 86-95.
5	Zarei S, Talesh Bahrami H R, Saffari H. Effects of geometry and dimension of micro/nano-structures on the heat transfer in dropwise condensation: a theoretical study[J]. Applied Thermal Engineering, 2018, 137: 440-450.
6	Seo D, Oh S, Shin S, et al. Dynamic heat transfer analysis of condensed droplets growing and coalescing on water repellent surfaces[J]. International Journal of Heat and Mass Transfer, 2017, 114: 934-943.
7	Feng J, Qin Z Q, Yao S H. Factors affecting the spontaneous motion of condensate drops on superhydrophobic copper surfaces[J]. Langmuir, 2012, 28(14): 6067-6075.
8	Dietz C, Rykaczewski K, Fedorov A G, et al. Visualization of droplet departure on a superhydrophobic surface and implications to heat transfer enhancement during dropwise condensation[J]. Applied Physics Letters, 2010, 97(3): 033104.
9	Ma X H, Zhou X D, Lan Z, et al. Condensation heat transfer enhancement in the presence of non-condensable gas using the interfacial effect of dropwise condensation[J]. International Journal of Heat and Mass Transfer, 2008, 51(7/8): 1728-1737.
10	ElSherbini A I, Jacobi A M. Liquid drops on vertical and inclined surfaces(Ⅰ): An experimental study of drop geometry[J]. Journal of Colloid and Interface Science, 2004, 273(2): 556-565.
11	Finkelstein Y, Tamir A. Interfacial heat transfer coefficients of various vapors in direct contact condensation[J]. The Chemical Engineering Journal, 1976, 12(3): 199-209.
12	Eimann F, Zheng S F, Philipp C, et al. Dropwise condensation of humid air—experimental investigation and modelling of the convective heat transfer[J]. International Journal of Heat and Mass Transfer, 2020, 154: 119734.
13	Eimann F, Zheng S F, Philipp C, et al. Convective dropwise condensation out of humid air inside a horizontal channel — experimental investigation of the condensate heat transfer resistance[J]. International Journal of Heat and Mass Transfer, 2018, 127: 448-464.
14	周兴东, 马学虎, 兰忠, 等. 滴状冷凝强化含不凝气的蒸气冷凝传热机制[J]. 化工学报, 2007, 58(7): 1619-1625.
	Zhou X D, Ma X H, Lan Z, et al. Mechanism of dropwise condensation heat transfer enhancement in presence of non-condensable gas[J]. Journal of Chemical Industry and Engineering (China), 2007, 58(7): 1619-1625.
15	Jiang J, Liu F, Zhang X F, et al. Model development and simulation on dropwise condensation by coupling absorption theory in the presence of non-condensable gas (NCG)[J]. International Communications in Heat and Mass Transfer, 2020, 119: 104936.
16	Baghel V, Sikarwar B S, Muralidhar K. Dropwise condensation from moist air over a hydrophobic metallic substrate[J]. Applied Thermal Engineering, 2020, 181: 115733.
17	Jung Y C, Bhushan B. Wetting behaviour during evaporation and condensation of water microdroplets on superhydrophobic patterned surfaces[J]. Journal of Microscopy, 2008, 229(1): 127-140.
18	Varanasi K K, Hsu M, Bhate N, et al. Spatial control in the heterogeneous nucleation of water[J]. Applied Physics Letters, 2009, 95(9): 094101.
19	Zhao Y J, Preston D J, Lu Z M, et al. Effects of millimetric geometric features on dropwise condensation under different vapor conditions[J]. International Journal of Heat and Mass Transfer, 2018, 119: 931-938.
20	Qi B J, Wei J J, Zhang L, et al. A fractal dropwise condensation heat transfer model including the effects of contact angle and drop size distribution[J]. International Journal of Heat and Mass Transfer, 2015, 83: 259-272.
21	Koch G, Kraft K, Leipertz A. Parameter study on the performance of dropwise condensation[J]. Revue Générale de Thermique, 1998, 37(7): 539-548.
22	齐宝金, 张莉, 徐宏, 等. 引入接触角的滴状冷凝分形传热功当量模型[J]. 高校化学工程学报, 2011, 25(5): 751-758.
	Qi B J, Zhang L, Xu H, et al. Contact angle affected fractal model of dropwise condensation heat transfer[J]. Journal of Chemical Engineering of Chinese Universities, 2011, 25(5): 751-758.
23	周兴东. 导热功能表面强化混合蒸气冷凝传热机理的研究[D]. 大连: 大连理工大学, 2007.
	Zhou X D. Enhancement mechanism of condensation heat transfer for steam-air mixtures using the good conductivity functional surface[D]. Dalian: Dalian University of Technology, 2007.
24	Lee S, Yoon H K, Kim K J, et al. A dropwise condensation model using a nano-scale, pin structured surface[J]. International Journal of Heat and Mass Transfer, 2013, 60: 664-671.
25	Chen X, Derby M M. Droplet departure modeling and a heat transfer correlation for dropwise flow condensation in hydrophobic mini-channels[J]. International Journal of Heat and Mass Transfer, 2018, 125: 1096-1104.
26	Graham C, Griffith P. Drop size distributions and heat transfer in dropwise condensation[J]. International Journal of Heat and Mass Transfer, 1973, 16(2): 337-346.
27	Abu-Orabi M. Modeling of heat transfer in dropwise condensation[J]. International Journal of Heat and Mass Transfer, 1998, 41(1): 81-87.
28	Vemuri S, Kim K J. An experimental and theoretical study on the concept of dropwise condensation[J]. International Journal of Heat and Mass Transfer, 2006, 49(3/4): 649-657.
29	Marek R, Straub J. Analysis of the evaporation coefficient and the condensation coefficient of water[J]. International Journal of Heat and Mass Transfer, 2001, 44(1): 39-53.
30	Zheng S F, Eimann F, Philipp C, et al. Experimental and modeling investigations of dropwise condensation out of convective humid air flow[J]. International Journal of Heat and Mass Transfer, 2020, 151: 119349.
31	Zheng S F, Eimann F, Philipp C, et al. Modeling of heat and mass transfer for dropwise condensation of moist air and the experimental validation[J]. International Journal of Heat and Mass Transfer, 2018, 120: 879-894.
32	Kim S, Kim K J. Dropwise condensation modeling suitable for superhydrophobic surfaces[J]. Journal of Heat Transfer, 2011, 133(8): 081502.
33	Yamali C, Merte Jr H. A theory of dropwise condensation at large subcooling including the effect of the sweeping[J]. Heat and Mass Transfer, 2002, 38(3): 191-202.
34	穆春丰. 表面特征对滴状冷凝初始液滴的形成及传热影响的研究[D]. 大连: 大连理工大学, 2008.
	Mu C F. Effect of surface characteristics of material on initial droplet formation and heat transfer of dropwise condensation[D]. Dalian: Dalian University of Technology, 2008.
35	Maa J R. Drop size distribution and heat flux of dropwise condensation[J]. The Chemical Engineering Journal, 1978, 16(3): 171-176.
36	Kim K, Lee Y, Jeong J H. Dropwise condensation induced on chromium ion implanted aluminum surface[J]. Nuclear Engineering and Technology, 2019, 51(1): 84-94.
37	王四芳. 超疏水表面混合蒸气滴状冷凝液滴行为与传热[D]. 大连: 大连理工大学, 2012.
	Wang S F. Wetting evolution and heat transfer characteristics in dropwise condensation of steam-air mixture on superhydrophobic surface[D]. Dalian: Dalian University of Technology, 2012.

[1]	晁京伟, 许嘉兴, 李廷贤. 基于无管束蒸发换热强化策略的吸附热池的供热性能研究[J]. 化工学报, 2023, 74(S1): 302-310.
[2]	程成, 段钟弟, 孙浩然, 胡海涛, 薛鸿祥. 表面微结构对析晶沉积特性影响的格子Boltzmann模拟[J]. 化工学报, 2023, 74(S1): 74-86.
[3]	吴馨, 龚建英, 靳龙, 王宇涛, 黄睿宁. 超声波激励下铝板表面液滴群输运特性的研究[J]. 化工学报, 2023, 74(S1): 104-112.
[4]	苏伟, 马东旭, 金旭, 刘忠彦, 张小松. 表面润湿性对霜层传递特性影响可视化实验研究[J]. 化工学报, 2023, 74(S1): 122-131.
[5]	张双星, 刘舫辰, 张义飞, 杜文静. R-134a脉动热管相变蓄放热实验研究[J]. 化工学报, 2023, 74(S1): 165-171.
[6]	张义飞, 刘舫辰, 张双星, 杜文静. 超临界二氧化碳用印刷电路板式换热器性能分析[J]. 化工学报, 2023, 74(S1): 183-190.
[7]	陈爱强, 代艳奇, 刘悦, 刘斌, 吴翰铭. 基板温度对HFE7100液滴蒸发过程的影响研究[J]. 化工学报, 2023, 74(S1): 191-197.
[8]	刘明栖, 吴延鹏. 导光管直径和长度对传热影响的模拟分析[J]. 化工学报, 2023, 74(S1): 206-212.
[9]	王志国, 薛孟, 董芋双, 张田震, 秦晓凯, 韩强. 基于裂隙粗糙性表征方法的地热岩体热流耦合数值模拟与分析[J]. 化工学报, 2023, 74(S1): 223-234.
[10]	李科, 文键, 忻碧平. 耦合蒸气冷却屏的真空多层绝热结构对液氢储罐自增压过程的影响机制研究[J]. 化工学报, 2023, 74(9): 3786-3796.
[11]	齐聪, 丁子, 余杰, 汤茂清, 梁林. 基于选择吸收纳米薄膜的太阳能温差发电特性研究[J]. 化工学报, 2023, 74(9): 3921-3930.
[12]	李艺彤, 郭航, 陈浩, 叶芳. 催化剂非均匀分布的质子交换膜燃料电池操作条件研究[J]. 化工学报, 2023, 74(9): 3831-3840.
[13]	王玉兵, 李杰, 詹宏波, 朱光亚, 张大林. R134a在菱形离散肋微小通道内的流动沸腾换热实验研究[J]. 化工学报, 2023, 74(9): 3797-3806.
[14]	陈美思, 陈威达, 李鑫垚, 李尚予, 吴有庭, 张锋, 张志炳. 硅基离子液体微颗粒强化气体捕集与转化的研究进展[J]. 化工学报, 2023, 74(9): 3628-3639.
[15]	洪瑞, 袁宝强, 杜文静. 垂直上升管内超临界二氧化碳传热恶化机理分析[J]. 化工学报, 2023, 74(8): 3309-3319.