DOIONLINE 
DOIONLINE Publish In |
International Journal of Mechanical and Production Engineering (IJMPE)-IJMPE |
 Journal Home Volume Issue |
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Issue |
Volume-6,Issue-3 ( Mar, 2018 ) | |||||||||
Paper Title |
Numerical Simulation of Natural Convection in Air Layers with Two Discrete Heaters | |||||||||
Author Name |
Samy M. Elsherbiny, Mohamed A. Teamah, Ibrahim A. Awad | |||||||||
Affilition |
Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt, 2Visiting Professor, Faculty of Engineering and Technology, Arab Academy for Science and Technology and Maritime Transport, Alexandria, Egypt | |||||||||
Pages |
33-43 | |||||||||
Abstract |
A numerical study on natural convection in rectangular air cavities with two discrete heaters was carried out to solve the governing equations bassed on the finite difference technique developed by Patankar. The numerical solution covers cases of natural convection for Prandtl number, Pr = 0.72, Rayleigh number ranging from 102 ≤ Ra ≤ 107, and cavity inclination angle, Φ from 0o to 180o with different aspect ratios, 0.5 ≤ A ≤ 50. The effects of heaters position ratio, B1 and B2, and heaters size ratio, 0.125 ≤ ε ≤ 0.375 were studied. The calculation grid used in the solution was tested to determine the best grid spacing and the effects of grid size on the numerical solution. The results are presented graphically in the form of streamline and isotherm contour plots. The heat transfer characteristics, local and average Nusselt number are presented and compared with previous results and good agreement was found. Keywords - Numerical Simulation; Natural convection; Air cavities; Discrete heating; Rectangular layers | |||||||||
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