NATURAL CONVECTION OF A HYBRID NANOFLUID-FILLED TRIANGULAR ANNULUS WITH AN OPENING

卷 8, 册 6, 2016, pp. 555-566

DOI: 10.1615/ComputThermalScien.2016018833

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Fatih Selimefendigil
Department of Mechanical Engineering, College of Engineering, King Faisal University, Al Ahsa 31982, Saudi Arabia; Department of Mechanical Engineering, Manisa Celal Bayar University, Manisa, Turkey

Ali J. Chamkha
Faculty of Engineering, Kuwait College of Science and Technology, Doha District, Kuwait; Center of Excellence in Desalination Technology, King Abdulaziz University, P.O. Box 80200, Jeddah 21589, Saudi Arabia; Mechanical Engineering Department, Prince Sultan Endowment for Energy and Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Saudi Arabia; RAK Research and Innovation Center, American University of Ras Al Khaimah, P.O. Box 10021, Ras Al Khaimah, United Arab Emirates

摘要

Natural convection of an Al₂O₃/ Cu-water hybrid nanofluid filled triangular annular cavity was numerically investigated. The inner and outer surfaces of the concentric triangular cavities are isothermal, and an opening is considered in the inclined side wall of the outer triangle. The governing equations are solved with the finite element method. The influence of the Rayleigh number (between 10⁴ and 5 × 10⁵), opening ratio (between 0 and 0.625), and solid volume fraction of the nanoparticles (between 0 and 0.02) on the fluid flow and heat transfer was considered. It was observed that the Nusselt number is enhanced with the Rayleigh number and opening ratio. The effects of the opening ratio on the heat transfer enhancement is more effective for higher values of Rayleigh numbers. The increment in the average heat transfer versus the solid nanoparticle volume fraction shows a linear relation, and the slope of the linear curve is higher for the solid volume fraction with higher thermal conductivity.

键词: annulus, open cavity, hybrid nanofluid, finite element method

对本文的引用

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