Specific heat capacity of molten salt-based alumina nanofluid

Abstract

There is no consensus on the effect of nanoparticle (NP) addition on the specific heat capacity (SHC) of fluids. In addition, the predictions from the existing model have a large discrepancy from the measured SHCs in nanofluids. We show that the SHC of the molten salt-based alumina nanofluid decreases with reducing particle size and increasing particle concentration. The NP size-dependent SHC is resulted from an augmentation of the nanolayer effect as particle size reduces. A model considering the nanolayer effect which supports the experimental results was proposed.

Experimental investigation on thermal properties of silver nanofluids

“…(5) and (6) should be noted that for Newtonian nanofluids. For the non-Newtonian fluid, the variation of the rheology does not depend on direct models but on the volume fractions of the nanoparticles (Cabaleiro et al, 2013;Lu and Huang, 2013). Fig.…”

Experimental investigation on surface tension of metal oxide–water nanofluids

“…However, one can confront difficulties to optimize the usage of the nanofluids in the heat transfer problems due to the insufficient studies about the surface tension of the nanofluids.In the literature, there exists a wide range of studies about the thermo-physical properties of the nanofluids, which mostly focus on thermal conductivity, viscosity, density, and specific heat[24][25][26][27].Nevertheless, an inadequate number of studies have been performed to measure the surface tension of the nanofluids even though, contradictory results have been reported[28]. In fact, a negligible variations were observed while measuring the surface tension of Al 2 O 3 -H 2 O nanofluids[5,29].…”

Thermal energy storage enhancement of a binary molten salt via in-situ produced nanoparticles

“…Introducing nanoparticle into a base fluid to improve its thermophysical properties, termed as 'nanofluid', has been extensively studied in the past [4][5][6][7][8]. Recently, similar concept was used to disperse suitable particles in solar salts to improve their thermal energy storage capacity [9][10][11][12][13][14][15][16][17], hence termed as 'nano-salt' here to consider the dispersion in both solid and liquid phases suitable for TES applications.. A majority of the work [18][19][20][21][22][23][24] showed that the specific heat of nano-salt was increased, except the experimental results of Lu et al [20]. For example, Shin and Banerjee [4] dispersed silica nanoparticles into alkali metal chloride salt eutectics, and reported a c p enhancement of 14.5% at 1 wt % particle concentration.…”