Open AccessGas content of a liquid in threaded roughness recesses and its effect on heat and mass exchange
Author(s) -
Н. А. Войнов,
Д. А. Земцов,
А. В. Богаткова,
N. V. Deryagina
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1181/1/012032
Subject(s) - multiphysics , mass transfer , bubble , materials science , heat exchanger , mechanics , heat transfer , air layer , surface finish , composite material , layer (electronics) , thermodynamics , physics , finite element method
This paper proposes a mechanism of gas bubble formation in a down-flowing liquid film as a result of reduced pressure in circulation zones of threaded roughness recesses. Simulation modelling on the Comsol Multiphysics software was used to calculate circulation loops, liquid velocities, and pressure. Thus, the accepted of gas bubble formation was justifying. We experimentally determined gas content along film thickness and its average value, and proposed an equation for calculating gas content along liquid layer thickness. The effect of gas content on the average thickness of a liquid film, as well as its heat and mass transfer, was confirmed.