Open AccessHeat transfer in the falling liquid film on an array of horizontal tubes with MAO coating
Author(s) -
А. Н. Павленко,
Н. И. Печеркин,
O. A. Volodin,
A. I. Kataev,
I. B. Mironova
Publication year - 2020
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 - 10.1088/1742-6596/1677/1/012091
Subject(s) - coating , materials science , porosity , tube (container) , heat transfer , composite material , surface roughness , freon , aluminium , surface finish , mechanics , thermodynamics , physics
The paper presents investigation results on heat transfer of falling liquid films of Freon R21 on an array of horizontal tubes with porous Al 2 O 3 coating obtained by the method of microarc oxidation (MAO coating). The microcharacteristics of samples (porosity, thickness, surface roughness) were measured. The results of measuring heat transfer coefficients on the surface of an aluminum tube with a MAO coating and a reference smooth tube were compared. Heat transfer on the surface of the tube with a porous coating was lower than on a smooth reference tube. It was shown that to intensify heat transfer on a surface with a MAO coating, it is necessary to increase the porosity of the coating and decrease its the thermal resistance.