«Previous Article|Table of Contents|Next Article»

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:

2019年02期

Page:

18-

Research Field:

能源与机械工程

Publishing date:

Info

Title:

Dynamic Behavioral Characteristics of Water Droplet Impacting onSuperhydrophobic-Hydrophilic Surface

Author(s):

Liu Xuanlin¹; Wang Xiaoshan¹; Zhao Dianwei¹; Hua Junye¹; 2; Zhao Xiaobao¹; 2; Li Dong¹; 2

(1.School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210042,China)(2.Engineering Laboratory of Energy System Process Conversion and Emission Reduction Technology of Jiangsu Province,Nanjing Normal University,Nanjing 210042,China)

Keywords:

superhydrophobic surface; drop impacting; dynamic behavior; visual experiment; contact angle

PACS:

TK124

DOI:

10.3969/j.issn.1672-1292.2019.02.003

Abstract:

The behavior of a single water droplet impacting on different surfaces is observed by high-speed camera,including bare surface,hydrophobic surface and hydrophobic-hydrophilic surface. Besides,the dynamic characteristics of droplet impacting on different surfaces are studied comparatively,so that how the impacting speed and wettability affect the behavior can be analyzed with different contact angles(115°,135°,150°). It is found that the water droplet spreads,retracts,rebounds or smashes in each dynamic process. The spread factor increases with the higher speed while the spreading time(3 ms)has no change. When the velocity of droplet is 2.43 m/s,the spreading factor is up to 3.43. The study shows that the rebound behavior of droplet impacting on the hydrophobic-hydrophilic surface does not happen. Moreover,more satellite droplets are produced as the contact angle becomes bigger and the speed becomes higher. In addition,the superhydrophobic-hydrophilic surfaces contribute to decreasing in volume of single droplet after retraction behavior.

References:

[1] BERTOLA V. An impact regime map for water drops impacting on heated surfaces[J]. International journal of heat and mass transfer,2015,85:430-437.
[2]WORTHINGTON A M. On the forms assumed by drops of liquids falling vertically on a horizontal plate[J]. Proceedings of the royal society of London,1876,25:261-272.
[3]李栋,王鑫,高尚文,等. 单液滴撞击超疏水冷表面的反弹及破碎行为[J]. 化工学报,2017,68(6):2473-2482.
LI D,WANG X,GAO S W,et al. Rebounding and splashing behavior of single water droplet impacting on cold superhydrophobic surface[J]. CIESC journal,2017,68(6):2473-2482.(in Chinese)
[4]ZHANG R,HAO P F,ZHANG X W,et al. Supercooled water droplet impact on superhydrophobic surfaces with various roughness and temperature[J]. International journal of heat and mass transfer,2018,122:395-402.
[5]杨宝海,王宏,朱恂,等. 速度对液滴撞击超疏水壁面行为特性的影响[J]. 化工学报,2012,63(10):3027-3033.
YANG B H,WANG H,ZHU X,et al. Effect of velocity on behavior of droplet impacting superhydrophobic surface[J]. CIESC journal,2012,63:3027-3033.(in Chinese)
[6]PATIL N D,BHARDWAJ R,SHARMA A. Droplet impact dynamics on micropillared hydrophobic surfaces[J]. Experimental thermal and fluid science,2016,74:195-206.
[7]LIU Y,MOEVIUS L,XU X. Pancake bouncing on superhydrophobic surfaces[J]. Nature physics,2014,10(7):515-519.
[8]LECLEAR S,LECLEAR J,ABHIJEET,PARK K C,et al. Drop impact on inclined superhydrophobic surfaces[J]. Journal of colloid and interface science,2016,461:114-121.
[9]JIN Z Y,WANG Z N,SUI D Y,et al. The impact and freezing processes of a water droplet on different inclined cold surfaces[J]. International journal of heat and mass transfer,2016,97:211-223.
[10]YIN C C,WANG T Y,CHE Z Z,et al. Oblique impact of droplets on microstructured superhydrophobic surfaces[J]. International journal of heat and mass transfer,2018,123:693-704.
[11]LI X L,ZHANG L,MA X W,et al. Dynamic characteristics of droplet impacting on prepared hydrophobic/superhydrophobic silicon surfaces[J]. Surface and coatings technology,2016,307:243-253.
[12]JOSSERAND,CHRISTOPHE,THORODDSEN S T. Drop impact on a solid surface[J]. Annual review of fluid mechanics,2016,48:365-391.
[13]刘冬薇,宁智,吕明,等. 液滴撞击超疏水壁面反弹及破碎行为研究[J]. 计算力学学报,2016,33(1):107-113.
LIU D W,NING Z,Lü M,et al. Rebounding and splashing behavior of water droplet impacting on superhydrophobic surface[J]. Chinese journal of computational mechanics,2016,33:107-113.(in Chinese)
[14]YAN J H,YANG K,ZHANG X B,et al. Analysis of impact phenomenon on superhydrophobic surfaces based on molecular dynamics simulation[J]. Computational materials science,2017,134:8-16.
[15]李西营,高丽,刘勇. 超疏水表面上液滴撞击动力学的研究[J]. 广州化工,2011,39(22):39-41.
LI X Y,GAO L,LIU Y. Study on the dynamics of water droplet impacting superhydrophobic surface[J]. Guangzhou chemical industry,2011,39(22):39-41.(in Chinese).

Memo

Memo:

-

Common functions

Last Update: 2019-06-30