Lattice Boltzmann simulation of flow and heat transfer evolution inside encapsulated phase change materials due to natural convection melting

Lin, Qi; Wang, Shugang; Li, Zhixiong; Wang, Jihong; Zhang, Tengfei

doi:10.1016/j.ces.2018.05.052

Cited by 32 publications

(4 citation statements)

References 46 publications

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“…Yang et al [23] proposed a 3D LB model to solve the three-dimensional natural convection problem with solid-liquid phase transition, including simulation of melting in a cubic cavity, convective melting in a rectangular inner cylinder enclosure and solid sphere melting in a cubic enclosure. Lin et al [24] used LBM to simulate the complex interaction of natural convection and melting of n-octadecane as phase change material in spherical capsules with different sizes. Yip et al [25] used the LB model with double distribution and multiple relaxation time to study the flow dynamics of natural convection in the process of paraffin melting using inserts with different inclination angles and positions.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of paraffin melting in circular tube using lattice Boltzmann method

Liu

Zhang

et al. 2022

THERM SCI

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Paraffin melting is widely used in the fields of phase change materials (PCMs) energy storage, gathering and transportation pipeline paraffin removal, etc. Analysis of the phase change mechanism and influencing factors of paraffin melting in the circular tube deeply has important guiding significance for improving the heat storage capacity by changing the structure of phase change material storage device and ensuring the safe transportation of crude oil in the pipeline. A double distribution lattice Boltzmann model based on enthalpy method is established to simulate the temperature field and the flow field of paraffin melting in a circular tube in this paper. The influence of different Rayleigh (Ra) number and Prandtl (Pr) number on the paraffin melting process in a circular tube is analyzed. The results show that the natural convection process is strengthened with the increase of the Ra number, and the decrease of the average Nusselt (Nu) number on the wall is smooth in the transition stage of wax melting due to the existence of fuzzy zone. The melting rate of paraffin can be accelerated or reduced by controlling the number Pr, so as to meet the relevant requirements of engineering.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of paraffin melting in circular tube using lattice Boltzmann method

Liu

Zhang

et al. 2022

THERM SCI

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“…The change of Nusselt number on the hot wall was analyzed, and it was considered that the particles promoted the melting process. Lin et al [13] utilized LBM to study the melting problem of PCM in spheres with different sizes. The correctness of the axisymmetric enthalpy model was verified Nusselt number on the hot wall.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on Nusselt number of moving phase interface during wax melting in tube using lattice Boltzman method

Zhou

Liu

et al. 2022

THERM SCI

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Paraffin melting is widely applied to the fields of phase change materials(PCMs) energy storage, gathering and transportation pipeline paraffin removal, etc. Natural convection is the main heat transfer mode during paraffin melting, and Ra number is an important factor affecting the change of natural convection intensity and Nu number. Nu number variation can reflect the influence of natural convection on heat transfer. The conventional Nu number of hot wall surface reflects only the convective heat transfer intensity of the fixed wall, while it does not take into account that the phase change interface has the characteristics of moving in the phase change process. A double distribution model of paraffin phase transformation in circular tube based on lattice Boltzmann method is established in this paper. The influence of Ra number on the temperature field and flow field of wax in circular tube is analyzed. The heat transfer process is reflected by Nu number of moving phase interface. The relation between Nu number of moving interface and Nu number of hot wall surface is also presented. The results show that the Nu number of moving phase interface can reflect the complex nonlinear characteristics of natural convection and describe the phase change heat transfer process of wax more accurately. Calculation formula of Nu number of moving phase interface and hot wall during wax phase change is proposed. Increasing Ra number can quicken the melting of wax to meet the actual engineering requirements.

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“…In the past few decades, thermal energy storage (TES) has drawn widespread attention in the field of energy utilization. − The dependency on secondary energy sources/carbon-based fuels can be minimized by the application of TES toward efficient and cleaner energy systems, thus enhancing the reliability of thermal energy from renewable sources and ultimately curbing global warming. − In addition, TES not only can be a means of providing thermal comfort in buildings and of conserving energy in various industrial sectors, such as the iron and steel industry in particular but also can further decrease the mismatch between energy supply and demand effectively. − Moreover, compared with other energy storage technologies, TES has lower capital costs, higher operational efficiency, and a wider range of applications. ,, …”

Section: Introductionmentioning

confidence: 99%

Thermal Stability of Nitrate-Based Form-Stable Thermal Storage Materials with In Situ Optical Monitoring

Huang

Tian

et al. 2020

Ind. Eng. Chem. Res.

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Thermal energy storage (TES) is a developing technology with promising applications in renewable energy and waste heat recovery. In this study, we investigate the thermal stability of recently developed nitrate-based form-stable TES materials. Laser-induced breakdown spectroscopy (LIBS) is applied to monitor the release of the Na and K elements in nitrates through chemical decomposition exposing to a simulated high heat flow field, while morphology and thermal performance are characterized by typical ex situ methods. The results reveal that the compatibility between ceramic skeleton materials (SiO 2 and MgO) and phase-change materials (NaNO 3 and KNO 3 ) plays an important role in the thermal performance of composite phase-change materials (CPCMs). A one-step thermal decomposition reaction of SS (sodium nitrate and silicon dioxide composite) and PS (potassium nitrate and silicon dioxide composite) and a two-step decomposition of SM (sodium nitrate and magnesium oxide composite) and PM (potassium nitrate and magnesium oxide composite) are demonstrated by synchronous thermal analysis (STA). The onset temperature of decomposition (OTD) obtained from in situ LIBS measurements is significantly lower than that obtained from STA.

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Lattice Boltzmann simulation of flow and heat transfer evolution inside encapsulated phase change materials due to natural convection melting

Abstract: Lattice Boltzmann simulation of flow and heat transfer evolution inside Lattice Boltzmann simulation of flow and heat transfer evolution inside encapsulated phase change materials due to natural convection melting encapsulated phase change materials due to natural convection melting

Cited by 32 publications

References 46 publications

Numerical simulation of paraffin melting in circular tube using lattice Boltzmann method

Numerical simulation of paraffin melting in circular tube using lattice Boltzmann method

Numerical study on Nusselt number of moving phase interface during wax melting in tube using lattice Boltzman method

Thermal Stability of Nitrate-Based Form-Stable Thermal Storage Materials with In Situ Optical Monitoring

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