Thermal Conductivity and Viscosity of Nanofluids Having Nanoencapsulated Phase Change Material

Barlak, Semahat; Şara, Osman Nuri; Karaipekli, Ali; Yapıcı, Sinan

doi:10.1080/15567265.2016.1174321

Cited by 87 publications

(26 citation statements)

References 48 publications

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“…Cingarapu et al 63 observed that adding silica encapsulated tin nanoparticles to the base fluid increases the thermal conductivity by 13% at nanoparticle volume fraction of 5%. A maximum thermal conductivity enhancement of 20% was reported by Barlak et al 64 when they dispersed polyurethane encapsulated n-nonadecane nanoparticles in different base fluids. According to Karaipekli et al 44 , the thermal conductivity improvement in LFTFs is mainly attributed to the Brownian motion of the NEPCMs and the interaction between the base fluid and surface functionalized NEPCMs.…”

Section: • Thermal Conductivitymentioning

confidence: 84%

Investigation of the novelty of latent functionally thermal fluids as alternative to nanofluids in natural convective flows

Haddad

Iachachene

Abu‐Nada

et al. 2020

Sci Rep

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This paper presents a detailed comparison between the latent functionally thermal fluids (LFTFs) and nanofluids in terms of heat transfer enhancement. The problem used to carry the comparison is natural convection in a differentially heated cavity where LFTFs and nanofluids are considered the working fluids. The nanofluid mixture consists of Al2O3 nanoparticles and water, whereas the LFTF mixture consists of a suspension of nanoencapsulated phase change material (NEPCMs) in water. The thermophysical properties of the LFTFs are derived from available experimental data in literature. The NEPCMs consist of n-nonadecane as PCM and poly(styrene-co-methacrylic acid) as shell material for the encapsulation. Finite volume method is used to solve the governing equations of the LFTFs and the nanofluid. The computations covered a wide range of Rayleigh number, 104 ≤ Ra ≤ 107, and nanoparticle volume fraction ranging between 0 and 1.69%. It was found that the LFTFs give substantial heat transfer enhancement compared to nanofluids, where the maximum heat transfer enhancement of 13% was observed over nanofluids. Though the thermal conductivity of LFTFs was 15 times smaller than that of the base fluid, a significant enhancement in thermal conductivity was observed. This enhancement was attributed to the high latent heat of fusion of the LFTFs which increased the energy transport within the cavity and accordingly the thermal conductivity of the LFTFs.

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Section: • Thermal Conductivitymentioning

confidence: 84%

Investigation of the novelty of latent functionally thermal fluids as alternative to nanofluids in natural convective flows

Haddad

Iachachene

Abu‐Nada

et al. 2020

Sci Rep

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“…e thermal expansion coefficient water is greatly above these particles. e dilute solution of NEPCMs has Nc � 23.8 and Nv � 12.5 [44]. e sensible capacity ratio of the NEPCM is 0.32.…”

Section: Resultsmentioning

confidence: 99%

“…where ρ sh is density of the shell, while ρ co is density of the core. ι is the core-shell mass ratio: ι ∼ 0.447 [44]. Furthermore, the density of the core is the mean of the fluid and solid phases of the phase change material.…”

Section: Model Formulationmentioning

confidence: 99%

Impact of Surface Undulation on Flow and Heat Transfer Characteristics in an Enclosure Filled with Nanoencapsulated Phase Change Materials (NEPCMs)

Alhashash

Saleh

2021

Mathematical Problems in Engineering

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The present study investigates the natural convection in a wavy enclosure caused by a thermal difference between a cold wall and a hot undulated wall. The enclosure is filled with hybrid nanofluids. The hybrid nanofluids are formed of a phase change material (PCM) suspended in the water. The PCM utilizes polyurethane as the shell and nonadecane as the core. The core absorbs or releases its energy in the shape of latent heat inside the water and contributes to thermal energy storage and heat transfer. The governing equations are expressed in PDEs and solved by the finite element method (FEM). Parametric studies were used to analyze the solid concentration, fusion temperature, amplitude of corrugation, number of corrugations, and Rayleigh number. It is found that the heat transfer rate enhances by the rise of the latent heat of the NEPCM cores. The global heat transfer can be improved by more than 12 % by adding 1 % of NEPCM particles volume fraction. However, the heat transfer tends to decrease by applying the wavy surface.

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“…Two reports have noted monomer effects on encapsulation using toluene diisocyanate along with amines as crosslinkers for polyurea shell formation. 131 , 132 Amines used have been ethylene diamine, diethylene triamine and Jeffamine (amine-terminated polyoxypropylene). Longer chain amines formed capsules of larger diameter, along with better coverage of the core material.…”

Section: Encapsulation Of Organic Pcmsmentioning

confidence: 99%

Nanoencapsulation of phase change materials for advanced thermal energy storage systems

et al. 2018

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Thermal Conductivity and Viscosity of Nanofluids Having Nanoencapsulated Phase Change Material

Cited by 87 publications

References 48 publications

Investigation of the novelty of latent functionally thermal fluids as alternative to nanofluids in natural convective flows

Investigation of the novelty of latent functionally thermal fluids as alternative to nanofluids in natural convective flows

Impact of Surface Undulation on Flow and Heat Transfer Characteristics in an Enclosure Filled with Nanoencapsulated Phase Change Materials (NEPCMs)

Nanoencapsulation of phase change materials for advanced thermal energy storage systems

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