Open AccessMechanism of Condensation Enhancement by Corrugated Low Finned Tubes in Presence of Noncondensable Gas
Author(s) -
Bin Ren,
Zhe Pu,
Xiaoying Tang,
Jifeng Wang,
Aini He,
Hongliang Lü
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/513/1/012009
Subject(s) - condensation , materials science , heat transfer enhancement , tube (container) , heat transfer coefficient , heat transfer , mass transfer , inlet , thermodynamics , composite material , mass fraction , physics , mechanical engineering , engineering
Corrugated tubes are the most convenient reinforcement techniques to enhance intube condensation. In this paper, the average condensation heat transfer coefficients inside the corrugated low finned tube and smooth tube were firstly introduced. The distribution of local heat transfer coefficient was presented at lower and higher inlet noncondensable gas mass fractions. The results show that the major heat transfer resistance is the thermal resistance of liquid film at lower inlet gas fraction. So the mechanism of condensation enhancement by corrugated low finned tubes is the increase of liquid film condensation coefficient. But at higher inlet gas fraction gas layer mass transfer resistance becomes the control thermal resistance. The spiral ribs inside corrugated low finned tube can thinner not only the gas layer thickness but also the liquid film thickness. The mechanism of condensation enhancement is the increase of both gas layer and liquid film condensation coefficient.