Open AccessExperimental studies on nucleate pool boiling heat transfer enhancement for composite nano-structure coated copper heating surface
Author(s) -
Vikash Kumar,
Sameer Sheshrao Gajghate,
Upasath,
Aniruddha Pal,
Swapan Bhaumik,
Soumik Das
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1240/1/012055
Subject(s) - materials science , wetting , nucleate boiling , contact angle , composite material , surface roughness , evaporation , composite number , heat transfer , boiling , heat transfer enhancement , copper , critical heat flux , heat transfer coefficient , metallurgy , chemistry , thermodynamics , physics , organic chemistry
The present paper is based on experimental studies on nucleate pool boiling heat transfer enhancement of different surfaces using water as a base fluid at atmospheric pressure. The test surfaces for the experiments include untreated, treated, and treated with Aluminum-silver oxide composite thin film surfaces having nano-layer thickness of 180 nm and 260 nm. The thin films are prepared on copper substrate by electron beam evaporation technique. The characterization of the heated surfaces is done by using optical surface profilometer for surface roughness and sessile drop method for contact angle measurement. The experiment is conducted in a closed boiling chamber and the heat flux is varied from 141.524 - 1244.101 kW/m 2 in time steps. The enhancement of heat transfer coefficient is found as 22.8%, 17.27% and 11.81% from the 260 nm, 180 nm composite nanostructured coated and treated surfaces respectively compared to plain surface. Enhancement in nanostructured coated surfaces is found higher due to the capillary effect, increased wettability and high active nucleate site density and the increased rate of bubble frequency.