Experimental investigation on the thermophysical properties of beryllium oxide-based nanofluid and nano-enhanced phase change material

Selvaraj, Vishnuprasad; Morri, Bindusai; Nair, Lakshmi M.; Haribabu, K.

doi:10.1007/s10973-019-08042-w

Cited by 27 publications

(5 citation statements)

References 35 publications

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“…Equation (9) was discussed in [ 26 ] and showed good agreement with experimental measurement for 15–25 nm spherical nanoparticles. Finally, the NePCM’s heat capacity was computed as:

…”

Section: Mathematical Modelsupporting

confidence: 62%

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Thermal Charging Optimization of a Wavy-Shaped Nano-Enhanced Thermal Storage Unit

et al. 2021

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A wavy shape was used to enhance the thermal heat transfer in a shell-tube latent heat thermal energy storage (LHTES) unit. The thermal storage unit was filled with CuO–coconut oil nano-enhanced phase change material (NePCM). The enthalpy-porosity approach was employed to model the phase change heat transfer in the presence of natural convection effects in the molten NePCM. The finite element method was applied to integrate the governing equations for fluid motion and phase change heat transfer. The impact of wave amplitude and wave number of the heated tube, as well as the volume concertation of nanoparticles on the full-charging time of the LHTES unit, was addressed. The Taguchi optimization method was used to find an optimum design of the LHTES unit. The results showed that an increase in the volume fraction of nanoparticles reduces the charging time. Moreover, the waviness of the tube resists the natural convection flow circulation in the phase change domain and could increase the charging time.

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“…Equation (9) was discussed in [ 26 ] and showed good agreement with experimental measurement for 15–25 nm spherical nanoparticles. Finally, the NePCM’s heat capacity was computed as:

…”

Section: Mathematical Modelsupporting

confidence: 62%

“…The volumetric expansion of NePCM is important for the evaluation of buoyancy forces. This coefficient for the NePCM mixture is evaluated as:

The Maxwell relation is employed to estimate the NePCM’s thermal conductivity as [ 26 ]:

…”

Section: Mathematical Modelmentioning

confidence: 99%

Thermal Charging Optimization of a Wavy-Shaped Nano-Enhanced Thermal Storage Unit

et al. 2021

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“…BeO nanopowder was produced using the hydrothermal method [ 9 ], the sol-gel method [ 10 ], and precipitation [ 11 , 12 ] from beryllium hydroxide, beryllium sulfate tetrahydrate and ammonium hydroxide.…”

Section: Introductionmentioning

confidence: 99%

Identification of Nano-Metal Oxides That Can Be Synthesized by Precipitation-Calcination Method Reacting Their Chloride Solutions with NaOH Solution and Their Application for Carbon Dioxide Capture from Air—A Thermodynamic Analysis

Khine

Kaptay

2023

Materials

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Several metal oxide nanoparticles (NPs) were already obtained by mixing NaOH solution with chloride solution of the corresponding metal to form metal hydroxide or oxide precipitates and wash—dry—calcine the latter. However, the complete list of metal oxide NPs is missing with which this technology works well. The aim of this study was to fill this knowledge gap and to provide a full list of possible metals for which this technology probably works well. Our methodology was chemical thermodynamics, analyzing solubilities of metal chlorides, metal oxides and metal hydroxides in water and also standard molar Gibbs energy changes accompanying the following: (i) the reaction between metal chlorides and NaOH; (ii) the dissociation reaction of metal hydroxides into metal oxide and water vapor and (iii) the reaction between metal oxides and gaseous carbon dioxide to form metal carbonates. The major result of this paper is that the following metal-oxide NPs can be produced by the above technology from the corresponding metal chlorides: Al2O3, BeO, CaO, CdO, CoO, CuO, FeO, Fe2O3, In2O3, La2O3, MgO, MnO, Nd2O3, NiO, Pr2O3, Sb2O3, Sm2O3, SnO, Y2O3 and ZnO. From the analysis of the literature, the following nine nano-oxides have been already obtained experimentally with this technology: CaO, CdO, Co3O4, CuO, Fe2O3, NiO, MgO, SnO2 and ZnO (note: Co3O4 and SnO2 were obtained under oxidizing conditions during calcination in air). Thus, it is predicted here that the following nano-oxides can be potentially synthesized with this technology in the future: Al2O3, BeO, In2O3, La2O3, MnO, Nd2O3, Pr2O3, Sb2O3, Sm2O3 and Y2O3. The secondary result is that among the above 20 nano-oxides, the following five nano-oxides are able to capture carbon dioxide from air at least down to 42 ppm residual CO2-content, i.e., decreasing the current level of 420 ppm of CO2 in the Earth’s atmosphere at least tenfold: CaO, MnO, MgO, CdO, CoO. The tertiary result is that by mixing the AuCl3 solution with NaOH solution, Au nano-particles will precipitate without forming Au-oxide NPs. The results are significant for the synthesis of metal nano-oxide particles and for capturing carbon dioxide from air.

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“…The Be-O bond appears to be a shared behavior of ionic and covalent bonds [ 15 ]. Several experimental and theoretical efforts have been made to investigate BeO nano-structures, which have been synthesized in various forms such as nano-fibers [ 16 ] and nano-particles [ 17 , 18 ]. The geometrical and electrical characteristics of diverse nano-clusters of BeO have been inspected, and this has proven that a Be 12 O 12 nano-cage possesses adequate stability [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

M-Encapsulated Be12O12 Nano-Cage (M = K, Mn, or Cu) for CH2O Sensing Applications: A Theoretical Study

Al-Nadary,

Eid,

Badran

et al. 2023

Nanomaterials

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DFT and TD-DFT studies of B3LYP/6–31 g(d,p) with the D2 version of Grimme’s dispersion are used to examine the adsorption of a CH2O molecule on Be12O12 and MBe12O12 nano-cages (M = K, Mn, or Cu atom). The energy gap for Be12O12 was 8.210 eV, while the M encapsulation decreased its value to 0.685–1.568 eV, whereas the adsorption of the CH2O gas decreased the Eg values for Be12O12 and CuBe12O12 to 4.983 and 0.876 eV and increased its values for KBe12O12 and MnBe12O12 to 1.286 and 1.516 eV, respectively. The M encapsulation enhanced the chemical adsorption of CH2O gas with the surface of Be12O12. The UV-vis spectrum of the Be12O12 nano-cage was dramatically affected by the M encapsulation as well as the adsorption of the CH2O gas. In addition, the adsorption energies and the electrical sensitivity of the Be12O12 as well as the MBe12O12 nano-cages to CH2O gas could be manipulated with an external electric field. Our results may be fruitful for utilizing Be12O12 as well as MBe12O12 nano-cages as candidate materials for removing and sensing formaldehyde gas.

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Experimental investigation on the thermophysical properties of beryllium oxide-based nanofluid and nano-enhanced phase change material

Cited by 27 publications

References 35 publications

Thermal Charging Optimization of a Wavy-Shaped Nano-Enhanced Thermal Storage Unit

Thermal Charging Optimization of a Wavy-Shaped Nano-Enhanced Thermal Storage Unit

Identification of Nano-Metal Oxides That Can Be Synthesized by Precipitation-Calcination Method Reacting Their Chloride Solutions with NaOH Solution and Their Application for Carbon Dioxide Capture from Air—A Thermodynamic Analysis

M-Encapsulated Be12O12 Nano-Cage (M = K, Mn, or Cu) for CH2O Sensing Applications: A Theoretical Study

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