Journal of Applied and Computational Mechanics
Investigation of Nanofluid Natural Convection Heat Transfer in Open Ended L-shaped Cavities utilizing LBM
Document Type : Research Paper
Authors
1 Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, P.O. Box 76175-133, Iran
2 Department of Mechanical Engineering, University of Bojnord, Bojnord, P.C. 945 3155111, Iran
3 Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, P.O. Box 76175-133, Iran
4 Department of Aerodynamics, Nanjing University of Aeronautics and Astronautics, Nanjing, China
Abstract
In this paper, laminar natural convection of copper/water nanofluid in an open-ended L-shaped cavity is investigated by Lattice Boltzmann Model (LBM). The results are compared by previous studies that are in good agreement. Influences of Rayleigh number (Ra = 103, 104, 105, 106), cavity aspect ratio (AR = 0.2, 0.4, 0.6) and volume concentration of Cu nanoparticles (0 ≤ Φ ≤ 0.1) on the momentum, thermal fields and heat transfer in the enclosure are studied. Also, the effect of changing the boundary conditions, on the heat transfer rate has been investigated. It is observed that maximum heat transfer enhancement by adding the nanoparticles for Ra = 106 with AR = 0.4 (32.76%) occurs. Results illustrate that increasing the cavity aspect ratio decreases heat transfer rate for Ra = 103 and Ra = 104. The least and most heat transfer rate for Ra = 105 occurs in enclosures by aspect ratios of 0.2 and 0.4 respectively, while it was observed at Ra = 106 for minimum and maximum rate of heat transfer the opposite behavior that at Ra = 105 occurs.
Keywords
Main Subjects
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