Flow Loop Experiments Using Polyalphaolefin Nanofluids

Nelson, Ian C.; Banerjee, Debjyoti; Ponnappan, Rengasamy

doi:10.2514/1.31033

Cited by 131 publications

(70 citation statements)

References 23 publications

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“…Since Nelson et al reported that the specific heat of a polyalphaolefin (PAO) nanofluid was significantly increased by adding a small amount of graphite nanoparticle fibers [17], several research groups reported that the specific heat is increased by adding nanoparticles. In particular, Dr. Banerjee's research groups reported that the specific heat of binary molten salt mixtures (or eutectic), which are considered as thermal energy storage media in concentrating solar power plants, can be enhanced via doping with nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

Kim¹,

Jo²

2018

Applied Sciences

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An anomalous increase of the specific heat was experimentally observed in molten salt nanofluids using a differential scanning calorimeter. Binary carbonate molten salt mixtures were used as a base fluid, and the base salts were doped with graphite nanoparticles. Specific heat measurements of the nanofluids were performed to examine the effects of the composition of two salts consisting of the base fluid. In addition, the effect of the nanoparticle concentration was investigated as the concentration of the graphite nanoparticles was varied from 0.025 to 1.0 wt %. Moreover, the dispersion homogeneity of the nanoparticles was explored by increasing amount of surfactant in the synthesis process of the molten salt nanofluids. The results showed that the specific heat of the nanofluid was enhanced by more than 30% in the liquid phase and by more than 36% in the solid phase at a nanoparticle concentration of 1 wt %. It was also observed that the concentration and the dispersion homogeneity of nanoparticles favorably affected the specific heat enhancement of the molten salt nanofluids. The dispersion status of graphite nanoparticles into the salt mixtures was visualized via scanning electron microscopy. The experimental results were explained according to the nanoparticle-induced compressed liquid layer structure of the molten salts.

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Section: Introductionmentioning

confidence: 99%

Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

Kim¹,

Jo²

2018

Applied Sciences

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“…Zhou and Ni [7] and Vijjha and Das [8] reported a decrease of C p of aqueous nanofluids. In contrast, the C p of poly-alpha-olefin (PAO) was reported enhanced by 50% when mixed with 0.6% of graphite nanoparticles [9]. By using silica nanoparticles, the C p of Li 2 -Co 3 -K 2 CO 3 eutectic salt was enhanced by 26% with 1% mass fraction [10].…”

Section: Introductionmentioning

confidence: 98%

Experimental investigation on the effect of PCM and nano-enhanced PCM of integrated solar collector performance

Lin

Al-Kayiem

Afolabi

2013

WIT Transactions on Ecology and the Environment

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The availability of hot water is essential for overnight industrial and domestic use. Integrating the solar heater with thermal energy storage showed a promising result on hot water production when sunlight is not present. In the present work, an outdoor experimental investigation of a flat plate solar collector was carried out with PCM and nano-enhanced PCM. The phase change material (PCM) used in this experiment is paraffin wax. However, 1% weight fraction of 20nm copper nanoparticles was added to improve the properties of the compound. Three cases have been investigated, namely, without PCM, with PCM and with nanoenhanced PCM (nano-PCM). It was found that at the operational mode of 0.5 kg/min and at a 10º inclination angle, with PCM and nano-PCM, hot water at 40.2ºC and 40.8ºC was produced the following morning. However, without the PCM case hot water was produced at 35.2ºC. The system was enhanced by 6.9% and 8.4% respectively when PCM and nano-PCM were used.

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“…There are some reports on enhancement in convective heat transfer by nanofluids. [7,[17][18][19][20][21][22][23][24][25][26][27][28][29] However, there are few studies showing inconsistent results as reported by Pak and Cho, [25] Chein and Chuang, [26] Ding et al, [27] Lee and Mudawar [28] and Nelson et al, [29] and also studies showing a decrease in heat transfer coefficient by the addition of nanoparticles to the base fluids. [27,30] The experiments were usually carried out in a pipe or channel flows with constant heat flux.…”

Section: Introductionmentioning

confidence: 99%

“…The authors proposed a modified dispersion model by considering nanofluid as single phase and introducing an additional term in governing equation to account backmixing and thermal dispersion. Ismail et al [37] studied buoyancy-driven natural convection heat transfer using Fluent for the experiment conducted by Nelson et al [29] using single-phase approach. Similar numerical simulations were performed by Rashmi et al [38,39] using the single-phase approach for Al 2 O 3 /water nanofluids to validate the experimental results of Putra et al [40] The authors took into account the effect of temperature on physical properties of nanofluids and they concluded that heat transfer decreases in natural convection flows.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of heat transfer in CNT nanofluids

Rashmi

Khalid

Ismail

et al. 2013

Journal of Experimental Nanoscience

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Nanofluids with their enhanced thermal conductivity are believed to be a promising coolant in heat transfer applications. In this study, carbon nanotube (CNT) nanofluids of 0.01 wt%, stabilised by 1.0 wt% gum arabic were used as a cooling liquid in a concentric tube laminar flow heat exchanger. The flow rate of cold fluid varied from 10 to 50 g/s. Both experimental and numerical simulations were carried out to determine the heat transfer enhancement using CNT nanofluids. Computational fluid dynamics (CFD) simulations were carried out using Fluent v 6.3 by assuming single-phase approximation. Thermal conductivity, density and rheology of the nanofluid were also measured as a function of temperature. The results showed thermal conductivity enhancement from 4% to 125% and nearly 70% enhancement in heat transfer with increase in flow rate. Numerical results exhibited good agreement with the experimental results with a deviation of AE3:0%. CNT nanofluids at 0.01 wt% CNTs showed Newtonian behaviour with no significant increase in the density.

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Flow Loop Experiments Using Polyalphaolefin Nanofluids

Cited by 131 publications

References 23 publications

Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

Experimental investigation on the effect of PCM and nano-enhanced PCM of integrated solar collector performance

Experimental and numerical investigation of heat transfer in CNT nanofluids

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