Numerical investigation on the effect of harmonic horizontal-axis rotation on laminar natural convection in an air-filled enclosure

Yu, Guojun; Lian, Zhiwei; Gan, Wei; Ji, Jun

doi:10.1016/j.ijheatmasstransfer.2020.119533

Cited by 10 publications

(3 citation statements)

References 43 publications

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“…In the context of the incompressible flow and heat transfer on the structured and unstructured grids, the advantages of IDEAL over other existing algorithms have been comprehensively demonstrated (Sun et al ., 2008a, b). The benefits of IDEAL have been widely confirmed, leading to its wide applications (Desrayaud and Lauriat, 2009; Sun et al ., 2009a, b, 2011a, b; Yu et al , 2019, 2020; Wang et al ., 2021; Deng et al ., 2017; Li et al ., 2019; Sun and Tao, 2023). However, to the best of the authors' knowledge, the presentation and application of compressible IDEAL algorithm in the unstructured grids have not been published in the literature.…”

Section: Introductionmentioning

confidence: 99%

Implementation of IDEAL algorithm based on Delaunay triangular mesh for 2D-compressible flows

Wu,

Zhang,

Dai

et al. 2024

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PurposeTo present the detailed implementation processes of the IDEAL algorithm for two-dimensional compressible flows based on Delaunay triangular mesh, and compare the performance of the SIMPLE and IDEAL algorithms for solving compressible problems. What’s more, the implementation processes of Delaunay mesh generation and derivation of the pressure correction equation are also introduced.Design/methodology/approachProgramming completely in C++.FindingsFive compressible examples are used to test the SIMPLE and IDEAL algorithms, and the comparison with measurement data shows good agreement. The IDEAL algorithm has much better performance in both convergence rate and stability over the SIMPLE algorithm.Originality/valueThe detail solution procedure of implementing the IDEAL algorithm for compressible flows based on Delaunay triangular mesh is presented in this work, seemingly first in the literature.

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Section: Introductionmentioning

confidence: 99%

Implementation of IDEAL algorithm based on Delaunay triangular mesh for 2D-compressible flows

Wu,

Zhang,

Dai

et al. 2024

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“…Yu et al (2020) conducted a numerical work to study the effect of rotation of a horizontal axis on free convection in a laminar regime with a cavity filled with air. They used the finite volume method is used to discretize the governing equations.…”

Section: Introductionmentioning

confidence: 99%

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

Shariatifard

Malekshah

Akbar

2021

HFF

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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.

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“…The flows based on natural convection are particularly significant in electric machinery, electronic power supplies, designing of spaceships, drying of porous substances in textile industries, and nuclear reactors. Furthermore applications of natural convection in engineering and sciences include solar ponds, oceanic and atmospheric circulation, and formation of micro-structure [27], [28]. Initially, Siegel [29] provided the foundation to study natural convection by investigating the time dependent natural convective flow over a semi infinite vertical plate.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Analysis of Unsteady Natural Convection Flow of Oldroyd-B Model in the Presence of Newtonian Heating and Radiation Heat flux

et al. 2020

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The main focus of this theoretical inspection is to explore the control of Newtonian heating on heat transfer for an unsteady natural convection flow of Oldroyd-B fluid confined to an infinitely long, vertically static plate. Partial differential equations are constructed effectively to describe the fluid flow and heat transfer. Some appropriate dimensionless quantities and Laplace transformation are employed as basic tools to evaluate the solutions of these differential equations. However, due to the complex nature of velocity field, solution is approximated by using Durbin's numerical Laplace inverse algorithm. This solution is further validated by obtaining the velocity solution through algorithms proposed by Stehfest and Zakian. The temperature and velocity gradient are also determined to anticipate the heat transfer rate and skin friction at wall. Some well known results in literature are also deduced from the considered model. Conclusively, to have a deep understanding of the physical mechanism of considered model, and influence of implanted parameters, some outcomes are elucidated with the assistance of tables and graphs. As a result, it is found that under the effect of Newtonian heating, freely convective viscous fluid has greater velocity than Oldroyd-B fluid, Maxwell fluid and second grade fluid. INDEX TERMS Free convection, Laplace transform, Newtonian heating, Oldroyd-B model, thermal radiation. NOMENCLATURE ρ Fluid density (kgm −3) g Acceleration due to gravity (ms −2) β Coefficient of thermal expansion (K −1) T Fluid temperature (K) x, y, z Spatial variables (m) u, v, w Velocity components (ms −1) The associate editor coordinating the review of this manuscript and approving it for publication was Hamid Mohammad-Sedighi. µ Dynamic viscosity (kgms −1) λ Relaxation time (s) λ r Retardation time (s) S Shear stress (Nm −2) ν Kinematic viscosity (m 2 s −1) k Thermal conductivity (Wm −1 K −1) c p Specific heat (Jkg −1 K −1) σ 1 Stefan-Boltzmann coefficient (Wm −2 K −4) K 1 Rosseland absorption constant (m −1) T ∞ Ambient temperature (K)

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Numerical investigation on the effect of harmonic horizontal-axis rotation on laminar natural convection in an air-filled enclosure

Cited by 10 publications

References 43 publications

Implementation of IDEAL algorithm based on Delaunay triangular mesh for 2D-compressible flows

Implementation of IDEAL algorithm based on Delaunay triangular mesh for 2D-compressible flows

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

Heat Transfer Analysis of Unsteady Natural Convection Flow of Oldroyd-B Model in the Presence of Newtonian Heating and Radiation Heat flux

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Numerical investigation on the effect of harmonic horizontal-axis rotation on laminar natural convection in an air-filled enclosure

Cited by 10 publications

References 43 publications

Implementation of IDEAL algorithm based on Delaunay triangular mesh for 2D-compressible flows

Implementation of IDEAL algorithm based on Delaunay triangular mesh for 2D-compressible flows

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

Heat Transfer Analysis of Unsteady Natural Convection Flow of Oldroyd-B Model in the Presence of Newtonian Heating and Radiation Heat flux

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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