Natural convection of rectangular cavity enhanced by obstacle and fin to simulate phase change material melting process using Lattice Boltzmann method

Yan, Gongxing; Alizadeh, As'ad; Rahmani, Amin; Zarringhalam, Majid; Shamsborhan, Mahmoud; Nasajpour-Esfahani, Navid; Akrami, Mohammad

doi:10.1016/j.aej.2023.09.035

Cited by 10 publications

(1 citation statement)

References 31 publications

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“…These simulation techniques enable scientists and engineers to model and analyze the intricate heat transfer and phase change phenomena that occur in PCM systems. Utilizing computational methods such as the Finite Volume Method (FVM) [12], Molecular Dynamics (MD) [13], and lattice Boltzmann method (LBM) [14], researchers are able to investigate the thermal behavior, transient responses, and overall efficacy of PCM-based systems under different conditions.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Heat Storage Cooling Systems via the Implementation of Honeycomb-Inspired Design: Investigating Efficiency and Performance

Rahmani,

Dibaj,

Akrami

2024

Energies

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This study presents a novel approach inspired by the hexagonal honeycomb structure found in nature, leveraging image processing algorithms to precisely define complex geometries in thermal systems. Hexagonal phase change material containers and thermally conductive fins were meticulously delineated, mirroring the intricate real-world designs of honeycombs. This innovative methodology not only streamlines setup processes but also enhances our understanding of melting dynamics within enclosures, highlighting the potential benefits of biomimetic design principles in engineering applications. Two distinct honeycomb structures were employed to investigate their impact on the melting process within cavities subject to heating from the left wall, with the remaining walls treated as adiabatic surfaces. The incorporation of a thermally conductive fin system within the enclosure significantly reduced the time required for a complete phase change, emphasizing the profound influence of fin systems on thermal design and performance. This enhancement in heat transfer dynamics makes fin systems advantageous for applications prioritizing precise temperature control and expedited phase change processes. Furthermore, the critical role of the fin system design was emphasized, influencing both the onset and location of the final point of melting. This underscores the importance of tailoring fin systems to specific applications to optimize their performance. Our study highlights the significant impact of the Rayleigh (Ra) number on the melting time in a cavity without fins, revealing a decrease from 6 to 0.4 as the Ra increased from 102 to 105; the introduction of a fin system uniformly reduced the melting time to Ste.Fo = 0.5, indicating fins’ universal effectiveness in optimizing thermal dynamics and expediting the melting process. Moreover, the cavity angle was found to significantly affect the fluid fraction diagram in unfanned cavities but had minimal impact when fins were present, highlighting the stabilizing role of fins in mitigating gravitational effects during melting processes. These insights expand our understanding of cavity geometry and fin interactions in heat transfer, offering potential for enhanced thermal system designs in various engineering applications. Decreasing thermal conductivity (λ) by increasing the fin thickness can halve the melting time, but the accompanying disadvantages include a heavier system and reduced energy storage due to less phase change material, necessitating a careful balance in decision-making.

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Section: Introductionmentioning

confidence: 99%

Enhancing Heat Storage Cooling Systems via the Implementation of Honeycomb-Inspired Design: Investigating Efficiency and Performance

Rahmani,

Dibaj,

Akrami

2024

Energies

Self Cite

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The Role of Periodic Mixing on Thermal Energy Extraction From an L‐Shaped Heater Covered by Porous Layer

Tarek,

Ismael

2024

Heat Trans

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In this numerical study, a technical solution is proposed to maximize heat transfer within a square cavity by integrating an L‐shaped porous layer in the lower right part of the cavity, covering an L‐shaped heat sink heated to a set temperature. Additionally, a thin bar undergoes a periodic sinusoidal motion with an amplitude of Vbar and a period of ωbar. The finite element method is used to solve the governing dimensionless nonlinear equations, with a mesh test supported by numerical and experimental validations. The study focuses on the effects of bar displacement amplitude (Vbar = 0.1–0.4), displacement period (ωbar = 1/3–1), Reynolds number (Re = 50, 100, and 200), Darcy number (Da = 10−2 and 10−4), and porosity (ε = 0.75–0.95) on the average Nusselt number, streamlines, and isotherms distribution. The numerical results show that increasing the bar displacement amplitude, Darcy number, and Reynolds number can significantly enhance the overall heat transfer, while an increase in the porosity of the porous medium has the opposite effect. The bar's sinusoidal motion and the porous medium's presence alter the flow dynamics within the cavity and directly influence heat transfer.

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Numerical investigation of the effect of the number of fins on the phase-change material melting inside a shell-and-tube cylindrical thermal energy storage

Rashid,

Khalaf,

Alizadeh

et al. 2024

Case Studies in Thermal Engineering

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Natural convection of rectangular cavity enhanced by obstacle and fin to simulate phase change material melting process using Lattice Boltzmann method

Cited by 10 publications

References 31 publications

Enhancing Heat Storage Cooling Systems via the Implementation of Honeycomb-Inspired Design: Investigating Efficiency and Performance

Enhancing Heat Storage Cooling Systems via the Implementation of Honeycomb-Inspired Design: Investigating Efficiency and Performance

The Role of Periodic Mixing on Thermal Energy Extraction From an L‐Shaped Heater Covered by Porous Layer

Numerical investigation of the effect of the number of fins on the phase-change material melting inside a shell-and-tube cylindrical thermal energy storage

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