THERMAL SCIENCE

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R. Yuvaraj

,

D. Senthkil Kumar

STUDY OF DROPLET DYNAMICS AND CONDENSATION HEAT TRANSFER ON SUPERHYDROPHOBIC COPPER SURFACE

ABSTRACT
Superhydrophobic 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 0.004-0.008 M 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, 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 0.006 M, 45°C 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 com-pared with condensation on bare copper plate produces higher heat transfer coefficient.
KEYWORDS
Superhydrophobic copper surface, contact angle, water droplet jump, rolling angle, dropwise condensation
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
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 1, PAGES [653 - 664]
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Study of droplet dynamics and condensation heat transfer on superhydrophobic copper surface

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence