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ISSN 打印: 1065-5131

ISSN 在线: 1563-5074

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 2.3 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.8 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.2 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00037 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.6 SJR: 0.433 SNIP: 0.593 CiteScore™:: 4.3 H-Index: 35

Indexed in

Experimental Investigation of Dropwise Condensation Heat Transfer on the Surface with a Surface Energy Gradient

卷 14, 册 3, 2007, pp. 243-256
DOI: 10.1615/JEnhHeatTransf.v14.i3.60
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摘要

An experimental study of motion of a water droplet and dropwise condensation on the surface with a surface energy gradient are reported in this paper. Two tested surfaces with a surface energy gradient are fabricated on a silicon wafer with dodecyltrichlorosilane and octrytrichlorosilane by the chemical vapor deposition (CVD) technology. The contact angles of a fine water droplet lying on the surface of the treated silicon wafer are measured employing the sessile drop method to characterize the surface wettability profile. Visualization of the motion of a water droplet on a horizontal surface with a surface energy gradient is performed using a high-speed video imaging system under ambient conditions. The experiments show that liquid droplets can move from the hydrophobic area to the hydrophilic area on the treated horizontal surface. The experiments on dropwise condensation of steam are conducted on the surfaces with a surface energy gradient at various inclination angles of 0°, 30°, 60°, and 90°, respectively. The growth, coalescence, motion, and detachment of the condensate droplets are visualized by the high-speed video imaging system. The results show that the condensate droplets larger than about 1 mm in diameter can move at a peak speed of 200 mm/s from the hydrophobic area to the hydrophilic area on the horizontal condensing surface with a surface energy gradient. The velocity of the condensate droplet is much higher than that of a droplet on the surface without a surface energy gradient in ambient conditions. A series of parametric studies, including the effects of the heat transfer temperature difference, of the inclination angle of a condensing surface, and the gradient of surface energy on the condensation heat transfer are performed in virtue of the photographic results. The experimental results show that the condensation heat transfer coefficient increases to reach a maximum value and decreases afterwards with increasing heat transfer temperature difference. A larger inclination angle of the condensing surface induces a higher condensation heat transfer coefficient due to the action of gravity on the departure and motion of the droplet while a larger gradient of surface energy leads to earlier departure and faster motion of the droplet, hence to a higher condensation heat transfer coefficient.

对本文的引用
  1. Zhu X., Wang H., Liao Q., Ding Y.D., Gu Y.B., Experiments and analysis on self-motion behaviors of liquid droplets on gradient surfaces, Experimental Thermal and Fluid Science, 33, 6, 2009. Crossref

  2. Huang Ziheng, Zhang Jiaoru, Cheng Jiang, Xu Shouping, Pi Pihui, Cai Zhiqi, Wen Xiufang, Yang Zhuoru, Preparation and characterization of gradient wettability surface depending on controlling Cu(OH)2 nanoribbon arrays growth on copper substrate, Applied Surface Science, 259, 2012. Crossref

  3. Lugli Francesca, Fioravanti Giulia, Pattini Denise, Pasquali Luca, Montecchi Monica, Gentili Denis, Murgia Mauro, Hemmatian Zahra, Cavallini Massimiliano, Zerbetto Francesco, And Yet it Moves! Microfluidics Without Channels and Troughs, Advanced Functional Materials, 23, 44, 2013. Crossref

  4. CHENG Jiang, SUN Yi-fei, ZHAO An, HUANG Zi-heng, XU Shou-ping, Preparation of gradient wettability surface by anodization depositing copper hydroxide on copper surface, Transactions of Nonferrous Metals Society of China, 25, 7, 2015. Crossref

  5. Zhou Liang, Huang Ziheng, Tao Yuhong, Cheng Jiang, Preparation of a gradient wettability surface based on organic-inorganic hybrid coating, 2012 International Workshop on Metamaterials (Meta), 2012. Crossref

  6. Cheng Jiang, Wang Gang, Zhang Yong, Pi Pihui, Xu Shouping, Enhancement of capillary and thermal performance of grooved copper heat pipe by gradient wettability surface, International Journal of Heat and Mass Transfer, 107, 2017. Crossref

  7. Abdulagatov A. I., Orudzhev F. F., Rabadanov M. Kh., Abdulagatov I. M., Copper nanowire arrays surface wettability control using atomic layer deposition of TiO2, Russian Journal of Applied Chemistry, 89, 8, 2016. Crossref

  8. Zhang Yong, Cheng Jiang, The Coating Property Study of (Meth)Acrylate Copolymer with Gradient Wettability Surfaces, Applied Mechanics and Materials, 723, 2015. Crossref

  9. El Fil Bachir, Kini Girish, Garimella Srinivas, A review of dropwise condensation: Theory, modeling, experiments, and applications, International Journal of Heat and Mass Transfer, 160, 2020. Crossref

  10. Lowrey Sam, Misiiuk Kirill, Blaikie Richard, Sommers Andrew, Survey of Micro/Nanofabricated Chemical, Topographical, and Compound Passive Wetting Gradient Surfaces, Langmuir, 38, 2, 2022. Crossref

  11. Deng Zilong, Gao Shangwen, Wang He, Liu Xiangdong, Zhang Chengbin, Visualization study on the condensation heat transfer on vertical surfaces with a wettability gradient, International Journal of Heat and Mass Transfer, 184, 2022. Crossref

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