Article
Mechanics
Gholamreza Kefayati
Summary: A mesoscopic method based on lattice Boltzmann method is introduced to simulate Newtonian and non-Newtonian nanofluids. The model is improved by considering various parameters, and the code is validated with previous studies. The results show good agreement and demonstrate the effectiveness of the proposed method.
Article
Thermodynamics
Cong Qi, Chunyang Li, Keao Li, Dongtai Han
Summary: The study investigated laminar convection of nanofluids in five types of solar energy collectors, analyzing the effects of different Rayleigh numbers, structures, and aspect ratios on heat transfer. Results showed that higher Rayleigh numbers intensified heat convection of nanofluids, while special structures weakened heat transfer effects.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Mechanics
Abbasali Abouei Mehrizi, Fatemeh Besharati, Omid Jahanian, Hamid Hassanzadeh Afrouzi
Summary: Utilizing a magnetic field and nanofluids can improve heat transfer performance in microchannels, particularly by significantly reducing frictional forces under high Hartmann numbers and slip coefficients, enhancing heat transfer efficiency by up to 50%.
Article
Energy & Fuels
Meng Wang, Xiuli Cheng, Yutao Huo, Zhonghao Rao
Summary: This paper establishes an enthalpy-transforming model based on the lattice Boltzmann method to solve the incompressible thermal flow problem of latent functional thermal fluid. The model is validated by simulating natural convection in a square cavity with good agreement with other works. The model is further applied to study the influence of different parameters on heat transfer in both two-dimensional and three-dimensional cases. The simulation results show the effectiveness of the model in simulating the flow and heat transfer of latent functional thermal fluid.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Sayed Mahdi Naghavi, Ghanbar Ali Sheikhzadeh
Summary: The study compared three methods for applying body force in LBM and identified the best method for large Richardson number flows, showing significant impact on the results.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Thermodynamics
Sai Ravi Gupta Polasanapalli, Kameswararao Anupindi
Summary: In this study, a characteristic-based off-lattice Boltzmann method was used to investigate mixed convection heat transfer. The effects of rotation strength and direction on flow and heat transfer were analyzed. The results showed that forced convection always resulted in lower heat transfer rates, while natural convection could lead to higher heat transfer rates in certain cases. Different configurations of the cylinders resulted in different heat transfer rates.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Jia Xu, TieZhu Qiao, Qing Li, GuoWei Zhang, GuiRong Hao
Summary: This study proposes an optimization method of crystal rotation to improve the quality of crystal seeding under complex convection. By calculating and analyzing the unsteady melt flow rate, internal temperature of the melt, and crystal rotation speed, the results show that this method can effectively restrain melt convection and improve the temperature distribution on the surface of the melt.
Article
Thermodynamics
Pawan Karki, D. Arumuga Perumal, Ajay Kumar Yadav
Summary: This study investigates laminar natural convection and entropy generation in Rayleigh-Benard convection using air, water, and alumina-water nanofluid as working fluids, with D(2)Q(9) and D(2)Q(5) LBM models. Results show an enhancement in heat transfer with the addition of nanoparticles, leading to a decrease in irreversibilities as volume fraction of nanoparticles increases in the base fluid. Additionally, deviations in critical Rayleigh number for air and the effects of irreversibility ratios on fluid flow and total irreversibilities are analyzed.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Sheng Chen, Wenhao Li, Hayder Mohammed
Summary: This study investigates the heat transfer characteristics of natural convection of large Prandtl number fluids in porous media using a novel lattice Boltzmann approach. It reveals significant differences between large and small Prandtl number fluids, with the former more easily transitioning from a convection-dominated process to a conduction-dominated one in porous media.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Younes Farkach, Soufiane Derfoufi, Mohammed Ahachad, Fatima Bahraoui, Mustapha Mahdaoui
Summary: This paper presents a numerical simulation of natural convection flow in annulus space with a partially heated inner cylinder. The study examines the effects of Rayleigh number and various cylinder ratios on Nusselt number, as well as velocity and thermal fields. The results show that Nusselt number increases with higher Rayleigh numbers and radius ratios. The fourth configuration, with heated zones on the left and right sides of the inner cylinder, offers better heat exchange under given conditions.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Ali Doostali, Masoud Madadelahi, Mohammadmehdi Namazi, Mina Azizi
Summary: The natural convective heat transfer inside a square enclosure containing Al2O3 and Cu nanofluids has been studied using Lattice Boltzmann method. A nonuniform sinusoidal heat flux was applied on one of the side boundaries. The calculated results and experimental data were in good agreement. It was shown that an increase in SVF and Ra number for Cu nanofluids decreases the maximum wall temperature by 48.3% and 49.2%, respectively. Cu-water nanofluid has about 30% higher rate of heat transfer compared to Al2O3-water. With an increase in SVF at low Ra number, the heat tends to be transferred at a constant rate. The enclosure containing Al2O3-water has lower absolute stream function values than Cu-water nanofluid by 26.6%.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Yan Su, Jane H. Davidson
Summary: A non-uniform stretched mesh scheme was developed to enhance the flexibility of the NDLBM for coupled flow and heat transfer simulations. The scheme directly expresses mesoscopic governing parameters, discrete directions, and local stretch gradients, eliminating the need for additional interpolations and adjustments. Simulation results showed that the scheme effectively captured temperature and velocity distributions, as well as Nusselt numbers, with minimal deviations compared to uniform grids.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Shihua Lu, Boyu He, Dongyan Gao, Weiwei Chen, Xinjun Li
Summary: The study investigates the effect of magnetic field on double-diffusive natural convection in an enclosure with heat-conducting partition. It found that the heat and mass transfer mechanisms are influenced by Hartmann number, and the flow pattern depends significantly on the magnetic field angle, with an optimal angle of 90 degrees for stable and maximum transfer rates. Additionally, correlations of the average Nusselt and Sherwood number were fitted.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Sajedeh Kebriti, Hamed Moqtaderi
Summary: This study developed a two-dimensional enthalpy-based lattice Boltzmann method to simulate the non-Newtonian melting process inside an enclosure. The effects of flow behavior index and Rayleigh number on Nusselt number and melting front position were investigated. Results showed that with an increase in flow behavior index, the average Nusselt number at the hot wall and the rate of melting decreased.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Muhammad Aqeel Ashraf, Zhenling Liu, Emad Hasani Malekshah, Lioua Kolsi, Ahmed Kadhim Hussein
Summary: The purpose of this work is to investigate the hydrodynamic and thermal performance of a thermal storage system using both numerical and experimental approaches. The researchers added Al2O3 nanoparticles to the lubricant and measured its thermal conductivity and dynamic viscosity. The numerical simulation was conducted using lattice Boltzmann equations and modifications were made to handle complex boundary conditions. Various results were reported, including flow structure, temperature distribution, entropy generation, and Nusselt number.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
