Outward melting of ice enhanced by Cu nanoparticles inside cylindrical horizontal annulus: Lattice Boltzmann approach

Jourabian, Mahmoud; Farhadi, Mousa; Darzi, A. Ali Rabienataj

doi:10.1016/j.apm.2013.04.003

Cited by 67 publications

(16 citation statements)

References 35 publications

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“…Methods based on the Lattice Boltzmann equations (LBE) have recently evolved as an approach to direct solutions of the macroscopic equations in porous media [15][16][17][18], nanofluid [19], phase change [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35], shock tube problem [36], droplet formation [37,38], turbulent natural convection [39] and so on [40][41][42]. Due to its particulate nature, the LBM has some benefits over the conventional Computational fluid dynamics (CFD) techniques such as handling complex boundaries and physical phenomena, the straightforward implementation on parallel machines, the incorporation of microscopic interactions and high speed of solving.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Melting of nanoparticles-enhanced phase change material (NEPCM) in vertical semicircle enclosure: numerical study

Jourabian

Farhadi

2015

J Mech Sci Technol

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Convection melting of ice as a Phase change material (PCM) dispersed with Cu nanoparticles, which is encapsulated in a semicircle enclosure is studied numerically. The enthalpy-based Lattice Boltzmann method (LBM) combined with a Double distribution function (DDF) model is used to solve the convection-diffusion equation. The increase in solid concentration of nanoparticles results in the enhancement of thermal conductivity of PCM and the decrease in the latent heat of fusion. By enhancing solid concentration of nanoparticles, the viscosity of nanofluid increases and convective heat transfer dwindles. For all Rayleigh numbers investigated in this study, the insertion of nanoparticles in PCM has no effect on the average Nusselt number.

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Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Melting of nanoparticles-enhanced phase change material (NEPCM) in vertical semicircle enclosure: numerical study

Jourabian

Farhadi

2015

J Mech Sci Technol

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“…An enthalpy-based lattice Boltzmann approach was used by Jourabian et al [90] to trace the phase change front of water embedded with copper nanoparticles in a cylindricalhorizontal annul. It was found that the temperature distribution rate of the mixture was faster than that of water, resulting in a higher melting rate.…”

Section: Numerical and Experimental Investigation On Thermodynamic Bementioning

confidence: 99%

Nano-enhanced phase change materials for improved building performance

Lin

Sohel

2016

Renewable and Sustainable Energy Reviews

168

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Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement. Abstract: Nano-enhanced phase change materials (PCMs) have attracted increasing attention to address one of the key barriers (i.e. low thermal conductivity) to the wide adoption of PCMs in many industrial applications. This paper discusses the generic problem and key issues associated with appropriately using this new class of materials in buildings for effective thermal management and improved energy performance. An overview on major recent development and application of nano-enhanced PCMs as thermal energy storage media is provided. A case study based on a PCM ceiling ventilation system integrated with solar photovoltaic thermal (PVT) collectors is then performed to evaluate the potential benefits due to the dispersion of copper nanoparticles into the PCM base fluid of RT24. The results showed that this nano-enhanced PCM has higher melting and solidification rates than that of the pure PCM. Compared to the use of the pure PCM, 8.3% more heat was charged in and 25.1% more heat was discharged from the nano-enhanced PCM under the three winter test days. More research is needed to understand the fundamental mechanisms behind the PCM thermal conductivity enhancement through the dispersion of nanometer-sized materials and to investigate how these mechanisms drive building performance enhancement.

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“…However, so far, studies on two-phase flow with the presence of nanofluids have been very limited. Jourabian et al [118] initiated the study of heat transfer enhancement of ice as a phase change material through dispersion of Cu nanoparticles. In order to include convection with solid-liquid phase change coupled with a moving melting front, a source term of temperature distribution function was introduced as follows…”

Section: Convective Heat Transfer Of Nanofluidsmentioning

confidence: 99%