Thermal protection with liquid film in turbulent mixed convection channel flows |
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| Affiliation: | 1. Department of Mechanical Engineering, Northern Taiwan Institute of Science and Technology, Pei-To, Taipei 112, Taiwan, ROC;2. Department of Mechatronic Engineering, Graduate Institute of Mechatronic Engineering, Huafan University, Shih-Ting, Taipei 223, Taiwan, ROC;1. Centre de Recherche en Technologie des Semi-conducteurs pour l’Energétique (CRTSE), 2, Bd Frantz Fanon, BP 140 Alger 7, Merveilles, 16038, Algeria;2. Division Etude et Prédiction des Matériaux, Unité de Recherche Matériaux et Energies Renouvelables, DEPM-URMER. Université de Tlemcen, B.P. 119, 13000, Tlemcen, Algeria;3. Centre de Développement des Technologies Avancées-CDTA, Cité du 20 Août 1956 Baba Hassen, B.P. 17 16303, Alger, Algeria;1. Department of Chemistry, V R Siddhartha Engineering College, Vijayawada 520 007, Andhra Pradesh, India;2. Department of Physics, Rayalaseema University, Kurnool 518 007, Andhra Pradesh, India;3. Department of Physics, V R Siddhartha Engineering College, Vijayawada 520 007, Andhra Pradesh, India;1. Department of Physics, Dr. V.S.Krishna Govt. Degree & PG College(A),Visakhapatnam, India;2. Department of Physics, Andhra University, Visakhapatnam 530003,India;3. Departmentof Physics, A.I. Cuza University, Iasi, Romania |
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| Abstract: | In this numerical study, a channel flow of turbulent mixed convection of heat and mass transfer with film evaporation has been conducted. The turbulent hot air flows downward of the vertical channel and is cooled by the laminar liquid film on both sides of the channel with thermally insulated walls. The effect of gas–liquid phase coupling, variable thermophysical properties and film vaporization are considered in the analysis. In the air stream, the k–ε turbulent model has been utilized to formulate the turbulent flow. Parameters used in this study are the mass flow rate of the liquid film B, Reynolds number Re, and the free stream temperature of the hot air To. Results show that the heat flux was dramatically increases due to the evaporation of liquid water film. The heat transfer increases as the mass flow rate of the liquid film decreases, while the Reynolds number and inlet temperature increase, and the influences of the Re and To are more significant than that of the liquid flow rate. It is also found that liquid film helps lowering the heat and mass transfer rate from the hot gas in the turbulent channel, especially at the downstream. |
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