Specific heat of nanofluids synthesized by dispersing alumina nanoparticles in alkali salt eutectic

Shin, Donghyun; Banerjee, Debjyoti

doi:10.1016/j.ijheatmasstransfer.2014.02.066

Cited by 190 publications

(78 citation statements)

References 37 publications

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“…Sonawane et al [50] investigated specific heat of Al 2 O 3 /ATF and reported the anomalous behavior of specific heat with volume concentration. Increase in specific heat capacity has been reported in experimental observations [48,[51][52][53][54][55][56][57]. Pakdaman et al [58] observed 21-42% decrease in specific heat capacity of MWCNT/water nanofluid for 0.1-0.4% vol.…”

Section: Specific Heat Capacitymentioning

confidence: 85%

“…As of now, the result of experimental data do not signal a discreet and clear cut indication whether there is only decrement in the heat capacity with increment of volume concentration, as has been reported by several investigators. Experimental observations on various nanofluids which show increase of specific heat capacity [48,50,51,[54][55][56][57]59], whereas experimental observations exhibit decrease in specific heat capacity performed by many researchers [18,46,47,50,[60][61][62][63][64][65][66][67][68]. It requires further study to correlate anomalous behavior in variation of specific heats and science behind it.…”

Section: Specific Heat Capacitymentioning

confidence: 99%

See 1 more Smart Citation

Progress of nanofluid application in solar collectors: A review

Verma

Tiwari

2015

Energy Conversion and Management

290

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Section: Specific Heat Capacitymentioning

confidence: 85%

Section: Specific Heat Capacitymentioning

confidence: 99%

Progress of nanofluid application in solar collectors: A review

Verma

Tiwari

2015

Energy Conversion and Management

290

View full text Add to dashboard Cite

“…to the DSC measurements and the SEM images, it may be concluded that the homogeneous dispersion of the nanoparticles favorably influences the specific heat enhancement of the nanofluids. Regarding the enhanced specific heat of molten salt nanofluids, the higher heat capacity of the nanoparticles, the interfacial thermal resistance at the solid-liquid interface, and the formation of the compressed liquid layer near the nanoparticles were proposed as mechanisms contributing to the increase of the specific heat [19,23,45].…”

Section: Resultsmentioning

confidence: 99%

“…Needleshaped structures and network-like structures are often shown in research papers concerning the specific heat of molten salt nanofluids [23,45]. It is reasonable to consider that the special structures are relevant to the specific heat increase.…”

Section: Resultsmentioning

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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“…These nanostructures have very high surface to volume ratio like nanoparticles and have higher specific heat than the bulk salt mixture. Several researches have been reported for the enhanced specific heat of molten salt/nanoparticle mixture [14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal properties of SiO2 nanocomposite for solar thermal energy storage applications

Shin

Banerjee

2015

International Journal of Heat and Mass Transfer

Self Cite

133

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a b s t r a c tIn this study the thermo-physical properties of a solid nano-composite material was measured and compared with the undoped solid material. SiO 2 nanoparticles were dispersed in eutectic of lithium carbonate and potassium carbonate (62:38 molar ratio) to obtain a high temperature nanocomposite. Specific heat measurement was performed using a differential scanning calorimeter (DSC). A laser flash apparatus (LFA) was used to measure thermal diffusivity. The thermal conductivity was computed based on the specific heat and the thermal diffusivity. On mixing (doping) with the nanoparticles at 1% concentration by weight the specific heat was enhanced by 5-15% and the thermal diffusivity was enhanced by 25-28%, respectively. The corresponding effective thermal conductivity of the nanocomposite was calculated to be enhanced by 35-45% compared with that of the undoped (pure) material. On performing scanning electron microscopy (SEM) of the nanocomposite a percolation network (interconnected substructure) of a dense material was observed. Such substructures were not observed in the undoped (pure) material. It is assumed that this percolation network of higher density phase that is observed to form around the nanoparticles is responsible for the enhancement of the thermal properties of the nanocomposite.

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Specific heat of nanofluids synthesized by dispersing alumina nanoparticles in alkali salt eutectic

Cited by 190 publications

References 37 publications

Progress of nanofluid application in solar collectors: A review

Progress of nanofluid application in solar collectors: A review

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

Enhanced thermal properties of SiO2 nanocomposite for solar thermal energy storage applications

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