THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Study of droplet dynamics and condensation heat transfer on superhydrophobic copper surface

ABSTRACT
Superhydrohobic surface for dropwise condensation is prepared using hotplate solution immersion method on copper substrate. The preprocessed bare copper plate is immersed in a solution consist of 0.004 - 0.008M ethanol (CH3−CH2−OH) and tetradecanoic acid (CH3(CH2)12COOH) then heating the plates in the solution at 30 - 50°C for 1 - 6 hours. The contact angle of water droplet on the prepared surface is measured using Low Bond Axisymmetric Drop Shape Analysis (LBADSA), which gives the maximum contact angle of 168° and average value of 166° ± 2°. The maximum contact angle is obtained by adjusting the composition of the solution, temperature of the solution and immersion time to 0.006M, 45° and 4 hours respectively. The various superhydrophobic surfaces are prepared by changing constituents of solution, hotplate temperature and processing time respectively. Further dynamic behavior of water droplet on the prepared surfaces like jumping effect and rolling effect is presented in this work. In addition, experimental work is carried out on the prepared surface for dropwise condensation and the obtained results are compared with condensation on bare copper plate produces higher heat transfer coefficient.
KEYWORDS
PAPER SUBMITTED: 2019-01-26
PAPER REVISED: 1970-01-01
PAPER ACCEPTED: 2020-02-24
PUBLISHED ONLINE: 2020-03-08
DOI REFERENCE: https://doi.org/10.2298/TSCI190126089Y
REFERENCES
  1. Schmidt, E., Schurig, W., Sellschopp, W., Versuche uber die Kondensation von Wasserdampf in Film und Tropfenform, Tech. Mech. Thermodyn., 1 (1930), pp. 53-63.
  2. Rose, J.W., On the mechanism of dropwise condensation, Int. J. Heat Mass Transfer, 10 (1967), pp. 755.
  3. Rose, J. W., Dropwise Condensation Theory and Experiments: A Review, Proc. Inst. Mech. Eng. Part A, 216 (2002), pp. 115-128.
  4. Leipertz, A., Fröba, A. P., Improvement of Condensation Heat Transfer by Surface Modification. Proceedings of the Seventh ASME, HMT Conference, IIT Guwahati, India, K7 (2006) k85-k99.
  5. Carey, V. P., Liquid-Vapor Phase-Change Phenomena, Hemisphere, New York, (1992) 342-351.
  6. Vemuri, S., Kim, K. J., Wood, B. D., Govindaraju, S., Bell, T. W., Long Term Testing for Dropwise Condensation Using Self-Assembled Monolayer Coating of N-Octadecyl Mercaptan. Applied Thermal Engineering, 26 (2006), pp. 421-429.
  7. Ucar, I. O., Erbil, H. Y., Dropwise condensation rate of water breath figures on polymer surfaces having similar surface free energies, Applied Surface Science, 259 (2012), pp. 515- 523.
  8. Starostin, A., Valtsifer, V., Barkay, Z., Legchenkova, I., Danchuk, V., Bormashenko, E., Drop-wise and film-wise water condensation processes occurring on metallic micro-scaled surfaces, Applied Surface Science, 444 (2018), 604-609.
  9. Kim, D. E., Ahn, H. S., Kwon, T., Experimental investigation of filmwise and dropwise condensation inside transparent circular tubes, Applied Thermal Engineering, 110 (2017), pp. 412-423.
  10. Yanagisawaa, K., Sakaib, M., Isobea, T., Matsushita, S., Nakajima, A., Investigation of droplet jumping on superhydrophobic coatingsduring dew condensation by the observation from two directions, Applied Surface Science, 315 (2014), pp. 212-221.
  11. Roudgar, M., Coninck, J. D., Condensation heat transfer coefficient versus wettability, Applied Surface Science, 338 (2015), pp. 15-21.
  12. Vilaro, I., Yagüe, J. L., Borros, S., Superhydrophobic copper surfaces with anti-corrosion properties fabricated by solventless CVD methods, ACS Appl. Mater. Interfaces, 9 (1) (2017), pp. 1057-1065.
  13. Xu, W., Hu, Y., Bao, W., Xie, X., Liu, Y., Song A., Hao, J., Superhydrophobic copper surfaces fabricated by fatty acid soaps in aqueous solution for excellent corrosion resistance, Applied Surface Science, 399 (2017), pp. 491- 498.
  14. Bahramia, H. R. T., Ahmadia, B., Saffaria, H., Optimal condition for fabricating superhydrophobic copper surfaces with controlled oxidation and modification processes, Materials Letters 189 (2017), pp. 62-65.
  15. Xu, N., Sarkar, D. K., Chen, X. G., Zhanga, H., Tong, W., Superhydrophobic copper stearate/copper oxide thin films by a simple one-step electrochemical process and their corrosion resistance properties, Journal of RSC advances, 6 (2016), pp. 35466-35478.
  16. Xu, X., Zhang, Z., Liu, W., Stable Biomimetic Super-Hydrophobic Copper Surface Fabricated by a Simple Wet-Chemical Method, Journal of Dispersion Science and Technology, 31 (2010), 4, pp. 488-491.
  17. Feng, L., Zhao, L., Qiang, X., Liu, Y., Sun, Z., Wang, B., Fabrication of superhydrophobic copper surface with excellent corrosion resistance, Applied Physics A: Materials Science & Processing. 119 (2015), 1, pp. 75-83.
  18. Wang, S., Feng, L., Jiang, L., One-Step Solution-Immersion Process for the Fabrication of Stable Bionic Superhydrophobic Surfaces, Adv. Mater. 18 (2006), pp. 767-770.
  19. Stalder, A.F., Melchior, T., Müller, M., Sage, D., Blu, T., Unser, M., Low-Bond Axisymmetric Drop Shape Analysis for Surface Tension and Contact Angle Measurements of Sessile Drops, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 364 (2010), 1-3, pp. 72-81.
  20. Hsu, S.H., Woana, K., Sigmund, W., Biologically inspired hairy structures for superhydrophobicity, Materials Science and Engineering R, 72 (2011), pp. 189-201.
  21. Stalder, A.F., Kulik, G., Sage, D., Barbieri, L., Hoffmann, P., A Snake-Based Approach to Accurate Determination of Both Contact Points and Contact Angles, Colloids And Surfaces A: Physicochemical And Engineering Aspects, 286 (2006), 1-3, pp. 92-103.
  22. Weisensee1, P. B., Tian, J., Miljkovic, N., King, W. P., Water droplet impact on elastic superhydrophobic surfaces, Scientific Reports, 6:30328 (2016).
  23. Crick, C. R., Parkin, I. P., Water droplet bouncing—a definition for superhydrophobic surfaces, Chem. Commun., 47 (2011), pp. 12059-12061.