THE STUDY OF THE EFFECTS OF RADIATION AND BLOWING FROM THE WALL OF A VERTICAL CHANNEL ON THE TURBULENT FREE CONVECTION HEAT TRANSFER
Ali Yari1 , Siamak Hosseinzadeh2* , Amin Bahrami3 , Morteza Radmanesh4
1 Department of Mechanical Engineering, University of Shiraz, Shiraz, Iran
2* Department of Mechanical Engineering, Islamic Azad University, West Tehran Branch, Tehran, Iran
3Department of Mechanical Engineering, University of Science and Technology, Tehran, Iran
4Department of Mechanical Engineering, University College of Rouzbahan, Sari, Iran
ABSTRACT
This article investigates the effects of radiation and blowing from a wall on a turbulent heat transfer in vertical channels with asymmetrical heating. The equations involved were numerically solved with three turbulent models including Spalart Allmaras, R-N-G k-ε with "Standard Wall Function" wall nearby model, R-N-G k-ε with "Enhanced Wall Treatment" wall nearby model and "Ray Tracing" radiation techniques. The results were compares with experimental data and appropriate methods were selected for turbulent modeling. The problem of Rayleigh number, Reynolds, radiation parameters and Prandtl were solved and the effects of these parameters on the flow lines, lines of constant temperature, radiation, convection, heat transfer caused by blowing and the total heat transfer were determined.
Keywords
Turbulent free convection, Radiation, Blowing, Channel flow.
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