Prediction of nanofluids properties: the density and the heat capacity

Zhelezny, Vitaly; Motovoy, Igor; Ustyuzhanin, E. E.

doi:10.1088/1742-6596/891/1/012347

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…Additionally, the polymerization of NPAPTMS can result in different extents of cross-linking in the PSA, which can cause different cross-linking densities in T-PSA NC that can synergistically influence the density. In general, density variations of mono NFs could be correlated with the concentration at a constant temperature (298 K) using theoretical formulas [ 69 , 70 ]. However, studies on such correlations are limited for defined composites/hybrids [ 71 ].…”

Section: Resultsmentioning

confidence: 99%

Studies on the Functional Properties of Titanium Dioxide Nanoparticles Distributed in Silyl–Alkyl Bridged Polyaniline-Based Nanofluids

Arumugam,

Velu,

Radhakrishnan

et al. 2023

Nanomaterials

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In the present work, a new kind of nanocomposite (NC)-based solid component was prepared for formulating nanofluids (NFs). The NC comprised metal oxide (titanium dioxide, TiO2) dispersed in a conducting polymer with polyaniline (PANI) and chemically linked silyl–alkyl units in it (PSA) that were designated as T-PSA NC. The NFs with ethylene glycol (EG) as a base fluid were prepared with T-PSA NCs with various compositions of TiO2 and PSA as well for various concentrations of T-PSA NCs. The scanning electron microscopic evaluation of the NC revealed that PSA deposition on TiO2 nanoparticles (NPs) decreased particle agglomeration. The PSA coating on the TiO2 NPs did not influence the crystalline structure of the TiO2 NPs, according to the X-ray diffraction patterns. The thermophysical characterization and molecular interaction features of the NFs at 303 K including a novel inorganic–organic T-PSA NC, were detailed. Furthermore, the stability of the T-PSA NC-based NFs was investigated experimentally using the zeta potential, and the particle size distribution change was analyzed using the dynamic light scattering (DLS) method. The T-PSA NCs had particle sizes that were significantly bigger than pristine PSA and pure TiO2. Most of the preparation conditions used to produce the T-PSA NCs resulted in moderately stable suspensions in EG. The results revealed that the ultrasonic velocity increased with the increase in the concentration of T-PSA NC mass % in the NFs, the refractive index and thermal conductivity increased with the increase in the concentration, and the surface tension exhibited a linear change when the ratio of mass % concentration of the T-PSA NCs increased. The combined presence of components that synergistically contribute to the electro, thermal, optical, and rheological properties is expected to attract advanced applications for NFs.

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Section: Resultsmentioning

confidence: 99%

Studies on the Functional Properties of Titanium Dioxide Nanoparticles Distributed in Silyl–Alkyl Bridged Polyaniline-Based Nanofluids

Arumugam,

Velu,

Radhakrishnan

et al. 2023

Nanomaterials

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Experimental comparison of specific heat capacity of three different metal oxides with MWCNT/ water-based hybrid nanofluids: proposing a new correlation

et al. 2020

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The main objective of this study is to investigate three distinct non-commonly used metal oxide-based nanoparticles, i.e., CuO + MWCNT, MgO + MWCNT, and SnO 2 + MWCNT with a weight mixture ratio of 80:20 each (by weight ratio) and DI water as a base fluid along with the addition of the CTAB surfactant at 3:2. The study incorporates the effect of varying size, d p (20-50 nm), different temperature range (25-50 °C), and volume concentration range of 0.25-1.5%. After examining the stability of prepared HNF over the 30th day from the preparation day and some of the meticulous experimentation on isobaric heat capacity, a new correlation is developed to predict the specific heat of hybrid nanofluid. Considering various parameters like various volume concentration (φ = 0.25-1.50%) and temperature range (T = 25-50 ℃), specific heat of nanofluid, specific heat of base fluid, density of nanofluid, density of base fluid, and average diameter of used nanoparticles. The developed correlation was with 2.93% and 0.903% maximum and average absolute deviation, respectively. Experimental results show the maximum decrement in specific heat value is about 15.09% compared to base fluid DI water at 25 ℃ and 1.50% volume concentration with an average particle diameter of 20 nm for the MgO + MWCNT (80:20)/water HNF. However, it is found that the rate of decrement decreases with the increase of d p from 20 to 50 nm. From the current experimental results, it is concluded that the usage of HNF on relatively higher temperature significantly influences the overall thermophysical properties such as enhancement in thermal conductivity and decrement in viscosity of the working fluid, by paying the marginal loss in specific heat capacity. Therefore, it recommended that the usage of HNF on higher temperature is more beneficial for critical heat transfer application such as HVAC, effective thermal management of the system, natural and forced convection phenomenon.

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