An investigation on heat transfer performance of polystyrene encapsulated n-octadecane based nanofluid in square channel

Joseph, Mathew; Sajith, V.

doi:10.1016/j.applthermaleng.2018.10.120

Cited by 44 publications

(7 citation statements)

References 36 publications

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“…Joseph and Sajith [15] focused on the study of heat transfer performance of polystyrene encapsulated phase change material (nanoPCM) based nanofluid. The nanoPCM was synthesized by miniemulsion polymerization in which PCM core (n-octadecane) is encapsulated within polystyrene shell.…”

Section: Nanofluid Flowsmentioning

confidence: 99%

Advances of Nanofluids in Solar Collectors - A Review of Numerical Studies

Menni¹,

Chamkha²,

Lorenzini³

et al. 2019

MMEP

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This paper presents a detailed review of the numerical studies carried out by various researchers in order to obtain enhanced heat transfer in free, forced, and mixed convection, under laminar, transition, and turbulent flow regimes, by using nanofluids in different solar collector geometries. Recently, nanofluids have been increasingly used in various solar collector configurations. Nano-sized metallic or non-metallic particles such as Cu, Au, Al2O3, SiO2, TiO2, CuO, etc, were used in the heat transfer fluid for various solid volume fractions. The average size of the particles was less than 100 nm. The higher conductivity of nanoparticles even at low particle concentration results in higher thermal conductivity of the base fluid and improves the thermal characteristics of the system. Nanoparticle size, type and shape are important factors for the thermal conductivity enhancement of the nanofluid with nanoparticles.

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Section: Nanofluid Flowsmentioning

confidence: 99%

Advances of Nanofluids in Solar Collectors - A Review of Numerical Studies

Menni¹,

Chamkha²,

Lorenzini³

et al. 2019

MMEP

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“…It was observed that with increasing concentration of microcapsules, the thermal conductivity of the slurry decreased because the thermal conductivity of PCM was lower than that of the base liquid. A similar conclusion followed from the subsequent experimental work carried out at one temperature of the slurry [ 18 , 19 ], or two different: one measurement was made when the PCM was a liquid, and one when it was a solid [ 20 ]. The authors of [ 20 ] found that when the PCM (n-octadecane) was solid, the value of the thermal conductivity of the slurry was lower than when the PCM was a liquid.…”

Section: Introductionmentioning

confidence: 70%

Experimental Investigation of the Apparent Thermal Conductivity of Microencapsulated Phase-Change-Material Slurry at the Phase-Transition Temperature

Dutkowski

Kruzel

2021

Materials

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The article presents the results of detailed studies of the thermal conductivity of the water slurry of microencapsulated PCM (mPCM) and slurry based on water–propylene glycol solutions. The starting product, MICRONAL® 5428 X, which contains about 43% microencapsulated paraffin with a transformation temperature of 28 °C, was mixed with the base liquid to obtain slurries with mass fractions of mPCM of 4.3, 8.6, 12.9, 17.2, 21.5, 25.8, 30.1, 34.4, 38.7, and 43.0%. Detailed measurements were carried out in the temperature range of 10–40 °C. It was found that: (a) an increase in the temperature of the slurry caused an increase in its thermal conductivity, both when PCM was in the form of a solid and a liquid; (b) the thermal conductivity of the mPCM slurry when the PCM was in liquid form was greater than the thermal conductivity of the slurry when the PCM was liquid; (c) during the phase transformation, a significant increase in the thermal conductivity of the slurry was observed, and its peak occurred when the temperature of the slurry reached the temperature declared by the manufacturer at which the phase-transition peak occurs.

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“…Adding 0.7% EPCM can achieve a 37% increment in heat transfer efficiency compared to single-phase coolant (deionized water). However, when the concentration of EPCM increases from 0.25% to 1.5%, the viscosity increases by 15%-22%, which directly leads to high pressure drop and pumping power (Joseph and Sajith, 2019). To optimize the performance of PCMS, some methods aiming to enhance the heat transfer are proposed, such as adding nanoparticles in the slurry (Rajabifar, 2015), using carbon nanotubes as the shell to increase the thermal conductivity, and adding liquidity-enhancing active agent (Sinha-Ray et al, 2014).…”

Section: Microchannelmentioning

confidence: 99%