Defrosting Evolution Behavior and Drainage Characteristic on Superhydrophobic Surface
After traditional thermal defrosting, a great number of water droplets still retain on the surface, which can become the base of secondary frosting and accelerate secondary frosting. Therefore, duly removing retained droplets after defrosting is of great importance. In this paper, the frost melting...
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Journal of Refrigeration Magazines Agency Co., Ltd.
2020-01-01
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| Series: | Zhileng xuebao |
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| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2020.01.048 |
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| author | Li Shuai Qian Chenlu Li Dong Zhao Xiaobao |
| author_facet | Li Shuai Qian Chenlu Li Dong Zhao Xiaobao |
| author_sort | Li Shuai |
| collection | DOAJ |
| description | After traditional thermal defrosting, a great number of water droplets still retain on the surface, which can become the base of secondary frosting and accelerate secondary frosting. Therefore, duly removing retained droplets after defrosting is of great importance. In this paper, the frost melting evolution on a superhydrophobic surface was visually observed and the effects of the surface inclination angle on defrosting droplet drainage from a bare surface and superhydrophobic surface (with a static contact angle of 88.0°and 151.1°respectively) were comparatively analyzed. The experimental results showed that the defrosting droplets, as an ice-water mixture, suspended on asuperhydrophobic surface with a Cassie state during the defrosting process on a horizontal superhydrophobic surface. Two kinds of behaviors, namely, single-film curling and multi-droplets coalescence, can be seen during the defrosting processes, due to a large static contact angle and tiny contact angle hysteresis. Most of defrosting droplets on an inclined superhydrophobic surface can be self-drained accompanied with ice-water mixture rolling and stripping, which differ from the bare surface. When the inclination angle is greater than 30°, the drainage ratio of the superhydrophobic surface can reach more than 90%, while that of the bare surface can only reach 70%. Furthermore, mechanical analysis of droplets on an inclined surface was applied. The critical droplet-slipping radius was deduced according to the surface wetting characteristics and surface inclination angle, which were consistent with the experiment results. |
| format | Article |
| id | doaj-art-0e18e6b87bb74d2d84af6ee7680d1123 |
| institution | DOAJ |
| issn | 0253-4339 |
| language | zho |
| publishDate | 2020-01-01 |
| publisher | Journal of Refrigeration Magazines Agency Co., Ltd. |
| record_format | Article |
| series | Zhileng xuebao |
| spelling | doaj-art-0e18e6b87bb74d2d84af6ee7680d11232025-08-20T02:47:18ZzhoJournal of Refrigeration Magazines Agency Co., Ltd.Zhileng xuebao0253-43392020-01-014166508789Defrosting Evolution Behavior and Drainage Characteristic on Superhydrophobic SurfaceLi ShuaiQian ChenluLi DongZhao XiaobaoAfter traditional thermal defrosting, a great number of water droplets still retain on the surface, which can become the base of secondary frosting and accelerate secondary frosting. Therefore, duly removing retained droplets after defrosting is of great importance. In this paper, the frost melting evolution on a superhydrophobic surface was visually observed and the effects of the surface inclination angle on defrosting droplet drainage from a bare surface and superhydrophobic surface (with a static contact angle of 88.0°and 151.1°respectively) were comparatively analyzed. The experimental results showed that the defrosting droplets, as an ice-water mixture, suspended on asuperhydrophobic surface with a Cassie state during the defrosting process on a horizontal superhydrophobic surface. Two kinds of behaviors, namely, single-film curling and multi-droplets coalescence, can be seen during the defrosting processes, due to a large static contact angle and tiny contact angle hysteresis. Most of defrosting droplets on an inclined superhydrophobic surface can be self-drained accompanied with ice-water mixture rolling and stripping, which differ from the bare surface. When the inclination angle is greater than 30°, the drainage ratio of the superhydrophobic surface can reach more than 90%, while that of the bare surface can only reach 70%. Furthermore, mechanical analysis of droplets on an inclined surface was applied. The critical droplet-slipping radius was deduced according to the surface wetting characteristics and surface inclination angle, which were consistent with the experiment results.http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2020.01.048superhydrophobic surfacedefrosting characteristicsdrainage ratiosurface inclination angle |
| spellingShingle | Li Shuai Qian Chenlu Li Dong Zhao Xiaobao Defrosting Evolution Behavior and Drainage Characteristic on Superhydrophobic Surface Zhileng xuebao superhydrophobic surface defrosting characteristics drainage ratio surface inclination angle |
| title | Defrosting Evolution Behavior and Drainage Characteristic on Superhydrophobic Surface |
| title_full | Defrosting Evolution Behavior and Drainage Characteristic on Superhydrophobic Surface |
| title_fullStr | Defrosting Evolution Behavior and Drainage Characteristic on Superhydrophobic Surface |
| title_full_unstemmed | Defrosting Evolution Behavior and Drainage Characteristic on Superhydrophobic Surface |
| title_short | Defrosting Evolution Behavior and Drainage Characteristic on Superhydrophobic Surface |
| title_sort | defrosting evolution behavior and drainage characteristic on superhydrophobic surface |
| topic | superhydrophobic surface defrosting characteristics drainage ratio surface inclination angle |
| url | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2020.01.048 |
| work_keys_str_mv | AT lishuai defrostingevolutionbehavioranddrainagecharacteristiconsuperhydrophobicsurface AT qianchenlu defrostingevolutionbehavioranddrainagecharacteristiconsuperhydrophobicsurface AT lidong defrostingevolutionbehavioranddrainagecharacteristiconsuperhydrophobicsurface AT zhaoxiaobao defrostingevolutionbehavioranddrainagecharacteristiconsuperhydrophobicsurface |