RT Journal Article
ID 1b66e6cf45c638e5
A1 Yin, Zhan
A1 Wen, Jianjun
A1 Zeng, Min
A1 Wang, Qiu-Wang
T1 NUMERICAL SIMULATION OF LAMINAR FILM CONDENSATION OF VAPOR IN A HORIZONTAL MINICHANNEL WITH AND WITHOUT A NONCONDENSABLE GAS
JF Heat Transfer Research
JO HTR
YR 2016
FD 2016-02-10
VO 47
IS 2
SP 141
OP 155
K1 condensation
K1 noncondensable gas
K1 numerical simulation
K1 volume of fluid (VOF)
AB A steady two-dimensional volume of fluid (VOF) simulation of laminar film condensation of vapor with and without a noncondensable gas inside a 1-mm horizontal minichannel is presented. The uniform interface temperature and wall temperature are fixed as boundary conditions, and the flow pattern is expected to be annular. The numerical simulation results display the evolution of the liquid−gas interface, Nu, and heat flux. It is found that the global effect of gravity is negligible. Moving downstream the minichannel, the liquid film grows rapidly near the entrance and then remains unchanged in the rest of the minichannel till the end. Higher inlet velocity and wall temperature of the minichannel lead to the augmentation of the average Nu value of condensation. The existence of a noncondensable gas makes the heat flux to decrease sharply compared to that vapor condensation, while a higher inlet velocity will aggravate this effect. Meanwhile, the noncondensable gas with smaller thermal conductivity would give rise to greater reduction of heat flux as a result of the higher thermal resistance in the noncondensable gas layer.
PB Begell House
LK http://dl.begellhouse.com/journals/46784ef93dddff27,49d564d677f1e773,1b66e6cf45c638e5.html