Thermal performance of parabolic-trough solar collector using double-population LBM with single-node/curved scheme and experimental evaluation on properties of SiO2-TiO2/EG nanofluid

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Alireza Shariatifard ◽  
Emad Hasani Malekshah ◽  
Narges Akbar
Keyword(s):  
Thermal Performance ◽  
Lattice Boltzmann ◽  
Solar Collector ◽  
Parabolic Trough ◽  
Single Node ◽  
Content Type ◽  
Numerical Process ◽  
Double Population ◽  
Boltzmann Method ◽  
Parabolic Trough Solar Collector

Purpose This paper aims to analyze the effect of absorber’s geometry and operating fluid on the thermal and hydrodynamic behaviors of a solar collector. Two different profiles are proposed for the absorber which is wavy and flat. Also, the inner tube of HTF (i.e. heat transfer fluid) is considered as single and double. The solar collector is filled with hybrid nanofluid of SiO2-TiO2/ ethylene glycol (EG) which its thermal conductivity and dynamic viscosity are measured using KD2 Pro and Brookfield LVDV III Ultra; respectively, in the temperature range of 30°C to 80°C and nanoparticle concentration in the range of 1.5% to 3.5%. Design/methodology/approach Among the solar collector, the parabolic-trough solar collector is one of the most efficient models for extracting solar thermal power. A parabolic trough solar collector with two different models of absorbers and included with two models of inner HTF tube is proposed. Findings The corresponding regression equations are derived versus temperature and volume fraction and used in the numerical process. For the numerical process, the thermal lattice Boltzmann method manipulated with a single-node curved scheme is used. Also, in the final step, the second law analysis is carried out in local and volumetric forms. The influential factors are Rayleigh number, the concentration of hybrid nano-powder and the structure of absorber profile. Originality/value The originality of the present work is combining a modern numerical method (i.e. double-population lattice Boltzmann method) with experimental observation on characteristics of SiO2-TiO2/EG nanofluid to analyze the thermal performance of parabolic trough solar collector.

Studies on Thermal Performance of Closed Type Parabolic Trough Solar Collector

2011 ◽  
Vol 347-353 ◽  
pp. 812-821
Author(s):  
Zhong Zhu Qiu ◽  
Peng Li ◽  
Shao Lin Gong ◽  
Ye Wang ◽  
Wen Wen Guo ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Solar Collector ◽  
Model Simulation ◽  
Test Bed ◽  
Parabolic Trough ◽  
Simulation Accuracy ◽  
Closed Type ◽  
Efficiency Test ◽  
Set Up ◽  
Parabolic Trough Solar Collector

To a closed type parabolic trough solar collector, thermal performance was analyzed, a mathematical model was set up, and test-bed of collector to heat efficiency test was built. According to the experiment test data, the accuracy of the thermal mathematics model was validated. The results show that the model simulation accuracy is so higher that the model is reasonable and available.

Lattice Boltzmann method to simulate convection heat transfer in a microchannel under heat flux

2019 ◽  
Vol 30 (6) ◽  
pp. 3371-3398 ◽  
Author(s):  
Masoud Mozaffari ◽  
Annunziata D’Orazio ◽  
Arash Karimipour ◽  
Ali Abdollahi ◽  
Mohammad Reza Safaei
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Convection Heat Transfer ◽  
Distribution Functions ◽  
Convection Heat ◽  
Content Type ◽  
Double Population ◽  
Boltzmann Method

Purpose The purpose of this paper is to improve the lattice Boltzmann method’s ability to simulate a microflow under constant heat flux. Design/methodology/approach Develop the thermal lattice Boltzmann method based on double population of hydrodynamic and thermal distribution functions. Findings The buoyancy forces, caused by gravity, can change the hydrodynamic properties of the flow. As a result, the gravity term was included in the Boltzmann equation as an external force, and the equations were rewritten under new conditions. Originality/value To the best of the authors’ knowledge, the current study is the first attempt to investigate mixed-convection heat transfer in an inclined microchannel in a slip flow regime.

Coupling of BGK lattice Boltzmann method and experimental rheological/thermal behavior of Al2O3–oil nanolubricant for modeling of a finned thermal storage

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Muhammad Aqeel Ashraf ◽  
Zhenling Liu ◽  
Emad Hasani Malekshah ◽  
Lioua Kolsi ◽  
Ahmed Kadhim Hussein
Keyword(s):  
Lattice Boltzmann Method ◽  
Entropy Generation ◽  
Lattice Boltzmann ◽  
Thermal Storage ◽  
Bejan Number ◽  
Content Type ◽  
Thermal Analyzer ◽  
Complex Boundary ◽  
Numerical Process ◽  
Boltzmann Method

Purpose The purpose of the present work is to investigate the hydrodynamic and thermal performance of a thermal storage based on the numerical and experimental approaches using the lattice Boltzmann method and the experimental observation on the thermo-physical properties of the operating fluid. Design/methodology/approach For this purpose, the Al2O3 nanoparticle is added to the lubricant with four nanoparticle concentrations, including 0.1, 0.2, 0.4 and 0.6Vol.%. After preparing the nanolubricant samples, the thermal conductivity and dynamic viscosity of nanolubricant are measured using thermal analyzer and viscometer, respectively. Finally, the extracted data are used in the numerical simulation using provided correlations. In the numerical process, the lattice Boltzmann equations based on Bhatnagar–Gross Krook model are used. Also, some modifications are applied to treat with the complex boundary conditions. In addition, the second law analysis is used based on the local and total views. Findings Different types of results are reported, including the flow structure, temperature distribution, contours of local entropy generation, value of average Nusselt number, value of entropy generation and value of Bejan number. Originality/value The originality of this work is combining a modern numerical methodology with experimental data to simulate the convective flow for an industrial application.

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