Numerical study for enhancement of solidification of phase change materials using trapezoidal cavity

Sharma, R. K.; Ganesan, P.; Sahu, J.N.; Metselaar, Hendrik Simon Cornelis; Mahlia, T.M.I.

doi:10.1016/j.powtec.2014.08.009

Cited by 63 publications

(14 citation statements)

References 37 publications

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“…After the selection of the PCM material, the geometry of the PCM container is the most influential factor in the heat transport performance of PCM systems. Many of the studies have been concerned with the heat transfer in cylinders, cylinder shells, rectangular cavities heated from the side [11,12,13,14,15,10,16] or even irregular non-symmetric geometries [17,18,19]. However, the configuration of a PCM within a rectangular container heated from below has received comparably less attention.…”

Section: Introductionmentioning

confidence: 99%

Dynamic of plumes and scaling during the melting of a Phase Change Material heated from below

Madruga

Curbelo

2018

International Journal of Heat and Mass Transfer

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We identify and describe the main dynamic regimes occurring during the melting of the PCM n-octadecane in horizontal layers of several sizes heated from below. This configuration allows to cover a wide range of effective Rayleigh numbers on the liquid PCM phase, up to ∼ 10 9 , without changing any external parameter control. We identify four different regimes as time evolves: (i) the conductive regime, (ii) linear regime, (iii) coarsening regime and (iv) turbulent regime. The first two regimes appear at all domain sizes. However the third and fourth regime require a minimum advance of the solid/liquid interface to develop, and we observe them only for large enough domains. The transition to turbulence takes places after a secondary instability that forces the coarsening of the thermal plumes. Each one of the melting regimes creates a distinct solid/liquid front that characterizes the internal state of the melting process. We observe that most of the magnitudes of the melting process are ruled by power laws, although not all of them. Thus the number of plumes, some regimes of the Rayleigh number as a function of time, the number of plumes after the primary and secondary instability, the thermal and kinetic boundary layers follow simple power laws. In particular, we find that the Nusselt number scales with the Rayleigh number as N u ∼ Ra 0.29 in the turbulent regime, consistent with theories and experiments on Rayleigh-Bénard convection that show an exponent 2/7. arXiv:1711.07744v1 [physics.flu-dyn]

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Section: Introductionmentioning

confidence: 99%

Dynamic of plumes and scaling during the melting of a Phase Change Material heated from below

Madruga

Curbelo

2018

International Journal of Heat and Mass Transfer

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“…In this article, Fluent software is used to simulate the heat transfer process in the tank. The main equations are given as follows [16][17][18] Continuity equation Energy equation…”

Section: Physical and Mathematic Modelsmentioning

confidence: 99%

Numerical simulation on heat transfer characteristics of the storage tank for concentrating solar power plant

Mao

Zhang

2016

Advances in Mechanical Engineering

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Concentrating solar power plant coupling with energy storage is a new and emerging technology, which can solve two issues, that is, low flux density and intermittent of solar energy. Heat transfer characteristics of the storage tank in this system have a key effect on the system's efficiency and cost. In this article, the heat transfer performance of a phase change thermal storage tank has been proposed, and the temperature distribution and liquid fraction of phase change material in the tank has numerically been investigated. The results show that the temperature increases with the increasing charge time. The results also show that there is a phase change process at the charge time of 200 min, and no phase change for the charge time of 250 and 300 min. The results of this article can provide a reference for future design and optimal operation of the storage tank in concentrating solar power plant.

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“…Using copper (Cu)/water as nanoparticle/PCM, several researchers investigated the performance of this combination on the solidification of PCMs in the trapezoidal cavity [27], latent heat storage considering wavy surface [28], and thermal energy storage in annuli [29]. In these studies [27,28,29], it is shown that the dispersion of nanoparticles in PCM causes a noticeable decrease in solidification or freezing as well as enhancement in heat release. It is found that employing various PCMs with a declining order of melting temperature is more effective in thermal energy storage [30].…”

Section: Introductionmentioning

confidence: 99%

Free convection of a suspension containing nano-encapsulated phase change material in a porous cavity; local thermal non-equilibrium model

Ghalambaz

Zadeh

Mehryan

et al. 2020

Heliyon

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Due to the instinctive temperature-dependent heat capacity of the Nano-Encapsulated Phase Change Material (NEPCM), there is a growing interest in the potential applications of such materials in heat transfer. As such, steady-state natural convection in a porous enclosure saturated with nanofluid using NEPCMs has been investigated in this study. The cavity is assumed to have constant hot and cold temperatures at the left and right vertical boundaries, respectively, and fully insulated from the bottom and top walls. Considering the Local Thermal Nonequilibrium (LTNE) approach for the porous structure, the governing equations are first non-dimensionalized and then solved by employing the finite element Galerkin method. The impact of different parameters, such as porous thermal conductivity (k s ), solid-fluid interface heat transfer (10 H 10 5 ), Stefan number (0.2 Ste 1), and volume fraction of nanoparticles (0.0 φ 0.05) on the patterns of the fluid and solid isotherms, streamlines and the contours of the heat capacity ratio, fusion temperature (0.05 θ f 1), local and average Nusselt numbers, and overall heat transfer ratio has been studied. It is shown that improving the porous thermal conductivity not only leads to an increase in the rate of heat transfer but also augments the fluid flow inside the cavity. For low values of the Ste, the rate of heat, transferred in the porous enclosure, is intensified. However, regardless of the amount of the Stefan number, the maximum rate of heat transfer is achievable when the non-dimensional fusion temperature is approximately 0.5. Employing NEPCMs in a highly conductive porous structure is more efficacious only when the phases are in the state of local thermal equilibrium. Nonetheless, the rate of heat transfer is higher when the Local thermal non-equilibrium is validated between the phases. Besides, for poor thermal conductivity of the porous medium like glass balls (LTE condition), adding 5% of the nano-encapsulated phase change materials to pure water can boost the rate of heat transfer up to 47% (for Ste ¼ 0.2 and θ f ¼ 0.5). This thermal investigation of NEPCMs shows in detail how advantageous are these nanoparticles in heat transfer and opens up an avenue for further application-based studies.

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Numerical study for enhancement of solidification of phase change materials using trapezoidal cavity

Cited by 63 publications

References 37 publications

Dynamic of plumes and scaling during the melting of a Phase Change Material heated from below

Dynamic of plumes and scaling during the melting of a Phase Change Material heated from below

Numerical simulation on heat transfer characteristics of the storage tank for concentrating solar power plant

Free convection of a suspension containing nano-encapsulated phase change material in a porous cavity; local thermal non-equilibrium model

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