tailieunhanh - Báo cáo hóa học: " Lattice Boltzmann simulation of alumina-water nanofluid in a square cavity"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Lattice Boltzmann simulation of alumina-water nanofluid in a square cavity | He et al. Nanoscale Research Letters 2011 6 184 http content 6 1 184 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Lattice Boltzmann simulation of alumina-water nanofluid in a square cavity 1 s -X 1 1 r 112 Yurong He Cong Qi Yanwei Hu Bin Qin Fengchen Li Yulong Ding Abstract A lattice Boltzmann model is developed by coupling the density D2Q9 and the temperature distribution functions with 9-speed to simulate the convection heat transfer utilizing Al2O3-water nanofluids in a square cavity. This model is validated by comparing numerical simulation and experimental results over a wide range of Rayleigh numbers. Numerical results show a satisfactory agreement between them. The effects of Rayleigh number and nanoparticle volume fraction on natural convection heat transfer of nanofluid are investigated in this study. Numerical results indicate that the flow and heat transfer characteristics of Al2O3-water nanofluid in the square cavity are more sensitive to viscosity than to thermal conductivity. List of symbols c Reference lattice velocity cs Lattice sound velocity cp Specific heat capacity J kg K ea Lattice velocity vector fa Density distribution function feq Local equilibrium density distribution function Fa External force in direction of lattice velocity g Gravitational acceleration m s2 G Effective external force k Thermal conductivity coefficient Wm K L Dimensionless characteristic length of the square cavity Ma Mach number Pr Prandtl number r Position vector Ra Rayleigh number t Time s Ta Temperature distribution function r q Local equilibrium temperature distribution function T Dimensionless temperature T0 Dimensionless average temperature T0 TH TC 2 TH Dimensionless hot temperature TC Dimensionless cold temperature Correspondence rong@ qicongkevin@ 1Schoolof Energy Science Engineering Harbin Institute of Technology Harbin 150001 China Full list of author information is available at the end