Lattice Boltzmann simulation of 3D natural convection in a cuboid filled with KKL-model predicted nanofluid using Dual-MRT model

Abstract

Purpose This study aims to investigate the three-dimensional natural convection and entropy generation in a cuboid enclosure filled with CuO-water nanofluid. Design/methodology/approach The lattice Boltzmann method is used to solve the problem numerically. Two different multiple relaxation time (MRT) models are used to solve the problem. The D3Q7–MRT model is used to solve the temperature field, and the D3Q19 is used to solve the fluid flow of natural convection within the enclosure. Findings The influences of different Rayleigh numbers (103 < Ra < 106) and solid volume fractions (0 < f < 0.04) on the fluid flow, heat transfer, total entropy generation, local heat transfer irreversibility and local fluid friction irreversibility are presented comprehensively. To predict thermo–physical properties, dynamic viscosity and thermal conductivity, of CuO–water nanofluid, the Koo–Kleinstreuer–Li (KKL) model is applied to consider the effect of Brownian motion on nanofluid properties. Originality/value The originality of this work is to analyze the three-dimensional natural convection and entropy generation using a new numerical approach of dual-MRT-based lattice Boltzmann method.

Comprehensive hydrothermal analysis of an inclined mini-channel with fin array: by dual/multi-relaxation-time LBM and experimental process on SiO2-glycol rheological/thermal characteristics

“…For examples, the natural convection can be found in the solar collector, heat exchangers, cooling of electronic devices, nuclear power plants, geothermal systems, HVAC, etc. (Rahimi et al, 2019a(Rahimi et al, , 2019b(Rahimi et al, , 2019c(Rahimi et al, , 2019dHooshmand et al, 2019;Al-Rashed Abdullah et al, 2019;KhakRah et al, 2019).…”

“…The results illustrated the great impact of surface radiation on thermal rate and flow field during natural convection. Rahimi et al (2019aRahimi et al ( , 2019bRahimi et al ( , 2019cRahimi et al ( , 2019d) provided a comprehensive review paper which covers the recent works on natural convection in different types of configurations, numerical methods and operating fluids. A great variety of geometries included with different physical and thermal boundary conditions, heat sources and fluid/ nanofluid media are analyzed.…”

“…It is found that the average Nusselt number has direct relation with Rayleigh number. A three-dimensional natural convection in a cuboid is analyzed using dual-multi-relaxation-time (MRT) model LBM by Rahimi et al (2019aRahimi et al ( , 2019bRahimi et al ( , 2019cRahimi et al ( , 2019d. The enclosure is filled with nanofluid which its properties are predicted using Koo-Kleinstreuer-Li (KKL) model.…”

Duan–Rach Approach to Study Al2O3-Ethylene Glycol C2H6O2 Nanofluid Flow Based upon KKL Model

“…Mohammadein et al [7] analyzed the effect of the magnetic field and thermal radiation effect on considering a CuO water-based nanofluid numerically. Rahimi et al [8] used the Lattice Boltzmann scheme to discuss the three-dimensional natural convection motion in cuboid fluid with the dual-MRT model. Rout and Mishra [9] contemplated about the thermal energy and magnetic nanofluid to examine the stretching flow.…”

An experimental/numerical hydrothermal-Second law analysis of a finned/tubular heat exchanger using Bhatnagar–Gross–Krook Lattice Boltzmann (BGKLBM) and rheological-thermal behavior of Fe2O3-water

“…Due to the fact that the convective flow and heat transfer are existed in many thermal devices, which have temperature difference in presence of gravity acceleration, the Analysis of a finned/tubular heat exchanger researchers are attracted to study the natural convection in all possible aspects. Some of the applications, which the natural convection can be found there, are solar collector, heat exchanger, HVAC, cooling of electronic devices, conjugate heat transfer and so on (Rahimi et al, 2018b;Rahimi et al,2019a;Rahimi et al, 2018a;Rahimi et al, 2019c;Rahimi et al, 2019b).…”