A spectral-element discontinuous Galerkin lattice Boltzmann method for simulating natural convection heat transfer in a horizontal concentric annulus

2014 ◽  
Vol 95 ◽  
pp. 197-209 ◽  
Author(s):  
Saumil Sudhir Patel ◽  
Misun Min ◽  
Kalu Chibueze Uga ◽  
Taehun Lee
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Discontinuous Galerkin ◽  
Lattice Boltzmann ◽  
Convection Heat Transfer ◽  
Spectral Element ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Concentric Annulus ◽  
Boltzmann Method

Lattice Boltzmann Simulation on Natural Convection Heat Transfer for Phase-Change with Heterogeneously Porous Medium

2011 ◽  
Vol 322 ◽  
pp. 61-67 ◽  
Author(s):  
Jiu Gu Shao ◽  
Yang Liu ◽  
You Sheng Xu
Keyword(s):  
Heat Transfer ◽  
Porous Medium ◽  
Natural Convection ◽  
Phase Change ◽  
Lattice Boltzmann ◽  
Convection Heat Transfer ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Lattice Boltzmann Simulation ◽  
Boltzmann Method

The problem of the natural convection heat transfer for phase-change in a square filled with heterogeneously porous medium is solved by lattice Boltzmann method. The lattice Boltzmann equation is governed by the heat conduction equation combined with enthalpy formation. The velocity of liquid part is fully coupled with the temperature distribution through relaxation time. It is found that the high Ra number has significantly impact on the heat transfer and convection, but the low Ra number has little influence on the natural convection. The porosity of the middle porous medium is nothing to do with the heat transfer and convection. The result is of great importance to engineering interest and also provides a new solution to phase transition.

Dual-MRT lattice Boltzmann method combined with experimental measurements of nanofluid’s properties for analysis of fin-orientation effect on natural convection heat transfer

2020 ◽  
Vol 30 (12) ◽  
pp. 5017-5035
Author(s):  
Xiaodong Wang ◽  
David Ross
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Free Convection ◽  
Lattice Boltzmann ◽  
Convection Heat Transfer ◽  
Experimental Measurements ◽  
Natural Convection Heat Transfer ◽  
Convection Heat ◽  
Content Type ◽  
Boltzmann Method

Purpose Natural convection heat transfer during free convection phenomenon in a cavity included with active fins and pipes is investigated. The influence of the orientation of fins on the heat transfer between heat source (i.e. hot fins) and heat sink (i.e. cold pipes) is investigated by using numerical and experimental techniques. Design/methodology/approach For the numerical simulations, the multiple relaxation time (MRT) thermal lattice Boltzmann method (LBM) is used. In this numerical approach, two separated distribution functions are used to solve the flow and temperature distributions within the computational domain. Furthermore, the local/volumetric second law analysis is used to show the impact of evaluated parameters on the heat transfer irreversibility. In addition, the dynamic viscosity and thermal conductivity of TiO2-water nanofluid are measured by using Brookfield viscometer and KD2 pro conductmeter, respectively. Findings The examined range of Rayleigh number is from 103 to 106, and the nanofluid samples are provided in 0, 20, 40, 60, 80 and 100 ppm. Originality/value The originality of this work is use of dual-MRT thermal LBM and experimental measurements of rheological/thermal properties of nanofluid for investigation of free convection problem for the considered application.

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