RETRACTED ARTICLE: Melting of nanoparticles-enhanced phase change material (NEPCM) in vertical semicircle enclosure: numerical study

Jourabian, Mahmoud; Farhadi, Mousa

doi:10.1007/s12206-015-0828-0

Cited by 47 publications

(7 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The authors indicated that the Lorentz force, caused by the Hartmann number, and buoyancy forces had positive and negative impacts on the solidification rate of nanoparticle-enhanced PCMs, respectively. Jourabian et al [31] utilised the enthalpy-based Lattice Boltzmann method and double distribution function to explore the melting process of the ice within a semicircle enclosure. The authors noticed that the concentration of nanoparticles had a positive and an adverse effect on the thermal conductivity and the latent heat of PCMs, respectively, but a negligible impact on the average Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

The Use of Capsuled Paraffin Wax in Low-Temperature Thermal Energy Storage Applications: An Experimental and Numerical Investigation

et al. 2021

View full text Add to dashboard Cite

The article deals with the experimental and numerical thermal-flow behaviours of a low-temperature Phase Change Material (PCM) used in Thermal Energy Storage (TES) industrial applications. The investigated PCM is a composition that consists of a mixture of paraffin wax capsuled in a melamine-formaldehyde membrane and water, for which a phase change process occurs within the temperature range of 4 °C to 6 °C and the maximum heat storage capacity is equal to 72 kJ/kg. To test the TES capabilities of the PCM for operating conditions close to real ones, a series of experimental tests were performed on cylindrical modules with fixed heights of 250 mm and different outer diameters of 15, 22, and 28 mm, respectively. The module was tested in a specially designed wind tunnel where the Reynolds numbers of between 15,250 to 52,750 were achieved. In addition, a mathematical model of the analysed processes, based on the enthalpy porosity method, was proposed and validated. The temperature changes during the phase transitions that were obtained from the numerical analyses in comparison with the experimental results have not exceeded 20% of the relative error for the phase change region and no more than 10% for the rest. Additionally, the PCM was examined while using a Scanning Electron Microscope (SEM), which indicated no changes in the internal structure during phase transitions and a homogeneous structure, regardless of the tested temperature ranges.

show abstract

Section: Introductionmentioning

confidence: 99%

The Use of Capsuled Paraffin Wax in Low-Temperature Thermal Energy Storage Applications: An Experimental and Numerical Investigation

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Nonetheless, knowing the fact that the PCMs have low thermal conductivity by instinct, which extremely affects the thermal performance in thermal energy systems, many investigators have tried to increase the overall thermal performance of the systems implementing several methods, such as using porous metal foams [3,4,5,6], metal matrix [7], fin [8,9,10,11], and nanoparticles dispersed into the PCMs [12,13,14,15], and nano-encapsulation PCMs [16,17,18,19]. Since nanoparticles play a promising role in enhancing the thermal performance of multifarious systems, the mixture of PCM and nanoparticles to produce Nano-enhanced Phase Change Materials (NePCM) has been extensively investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Figure12. Variation of the total heat transfer (left) and total heat transfer ratio (right) with the volume fraction of NEPCMs, interface heat transfer parameter and the thermal conductivity of the porous matrix (Ste ¼ 0.2 and θ f ¼ 0.5).…”

mentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…In contrast, the lattice Boltzmann (LB) model with the volumetric LB scheme can avoid the empirical mushy zone constant with no free parameters when it is used for simulating the melting process [23,24]. The evolution of temperature and mushy zone by using the lattice Boltzmann method (LBM) was investigated in various cavities such as square cavity [25][26][27], semicircle enclosure [28], an annulus between two coaxial vertical cylinders [29], and more complex structures [30,31].…”

Section: Introductionmentioning

confidence: 99%

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

Lin

Wang

et al. 2018

Chemical Engineering Science

View full text Add to dashboard Cite

show abstract

RETRACTED ARTICLE: Melting of nanoparticles-enhanced phase change material (NEPCM) in vertical semicircle enclosure: numerical study

Cited by 47 publications

References 56 publications

The Use of Capsuled Paraffin Wax in Low-Temperature Thermal Energy Storage Applications: An Experimental and Numerical Investigation

The Use of Capsuled Paraffin Wax in Low-Temperature Thermal Energy Storage Applications: An Experimental and Numerical Investigation

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

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

Contact Info

Product

Resources

About