Cherif A.S.,National School of Architecture |
Cherif A.S.,University of Carthage |
Kassim M.A.,LMFE |
Benhamou B.,LMFE |
And 3 more authors.
International Journal of Thermal Sciences | Year: 2011
The objective of the present study is to investigate experimentally the effect of film evaporation on mixed convective heat and mass transfer in a vertical rectangular channel. Two parallel channel walls are wetted by a water film and heated by a constant heat flux, while the other walls are dry and thermally insulated. The liquid film temperature, the evaporated flow rate, the upward airflow temperature and humidity are measured. Wide ranges of inlet airflow velocity, heat flux and liquid film flow rate are considered. Cases of laminar and turbulent airflow are considered. The experimental results show that evaporation takes place on the majority of the surface of the two walls and, in some cases, evaporative cooling occurs especially for small heating flux and large air velocities. Moreover, a numerical study is carried out in the case of a laminar flow and its results are compared to experimental ones. These comparisons lead to a good agreement with respect to liquid film and airflow temperatures in addition to the evaporated flow rate.© 2011 Elsevier Masson SAS. All rights reserved.
Oulaid O.,LMFE |
Oulaid O.,Université de Sherbrooke |
Benhamou B.,LMFE |
Galanis N.,Université de Sherbrooke
Computational Thermal Sciences | Year: 2010
This paper reports on a numerical study of laminar mixed convection flow associated with mass transfer and phase change in a vertical parallel-plate channel. The plates are wetted by thin liquid water films and maintained at a constant temperature lower than that of the air entering the channel. The solution of the governing equations is based on the finite volume method with the well-known SIMPLER algorithm for handling the velocity-pressure coupling. Numerical results show that buoyancy forces have an important effect on the hydrodynamic field, as well as on the heat- and mass-transfer characteristics. These forces induce a flow reversal. Additionally, heat transfer associated with phase change (i.e., latent heat transfer) is more important compared to sensible heat transfer. Copyright © 2010 Begell House, Inc.