Experimental study of the sensible heat storage in the water/TiO2 nanofluid enclosed in an annular space

El-Kaddadi, Latifa; Asbik, Mohamed; Zari, Nadia; Zeghmati, Belkacem

doi:10.1016/j.applthermaleng.2017.05.054

Cited by 26 publications

(5 citation statements)

References 32 publications

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“…Meanwhile, there are also many attempts that have been made for application of nanofluid, especially in energy systems [8–11]. Due to the enhancement in heat and mass transfer process, TiO 2 nanofluids have been tentatively applied to the fields of solar collectors [12], refrigeration [13–16], energy storage [17, 18], heat pipes [19–21], and other energy applications [22–34], such as car radiator [31], PV/T hybrid system [32, 33], and combined heat and power (CHP) systems [34]. In our previous studies, the heat transfer characteristics of TiO 2 nanofluids in heat conduction, forced convection boiling heat transfer, and natural convection heat transfer have been summarized [35].…”

Section: Reviewmentioning

confidence: 99%

Toward TiO2 Nanofluids—Part 2: Applications and Challenges

Yang

2017

Nanoscale Res Lett

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The research about nanofluids has been explosively increasing due to their fascinating properties in heat or mass transportation, fluidity, and dispersion stability for energy system applications (e.g., solar collectors, refrigeration, heat pipes, and energy storage). This second part of the review summarizes recent research on application of TiO2 nanofluids and identifies the challenges and opportunities for the further exploration of TiO2 nanofluids. It is expected that the two exhaustive reviews could be a helpful reference guide for researchers to update the knowledge on research status of TiO2 nanofluids, and the critical comments, challenges, and recommendations could be useful for future study directions.

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Section: Reviewmentioning

confidence: 99%

Toward TiO2 Nanofluids—Part 2: Applications and Challenges

Yang

2017

Nanoscale Res Lett

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“…Moving away from the inner lateral surface, Figure 6 reveals that there is an average temperature difference of 5 • C between both base surfaces (bottom and top surfaces). This fact can be explained by suspension particles [28,29] and their migration to the reactor top (Figure 9a-c) owing to their low bulk density [2] as well as their thermal conductivity [23] compared to those of water. Figure 5a-c and also Figure 6 prove that there are wide variations of temperature gradients in the vicinity of the vertical wall (r = R), while they become small far enough from it (Figure 6).…”

Section: Fluid Flow and Heat Transfer Analysismentioning

confidence: 99%

Analysis of Fluid Flow and Heat Transfer inside a Batch Reactor for Hydrothermal Carbonization Process of a Biomass

et al. 2022

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This work analyzes the heat transfer and fluid flow within a batch reactor for hydrothermal carbonization (HTC) of raw olive pomace (ROP). The autoclave is partially filled with a mixture of ROP and distilled water and hence it is considered as a dispersed medium. The reactor is heated through its lateral surface, whereas the bottom wall and the upper surface of the mixture are thermally insulated. Under the effect of heat and pressure, the fluid moves inside the reactor, while particles are subject to other forces. Additionally, the biomass (ROP) is decomposed into very fine particles to produce a solid product (hydrochar). COMSOL Multiphysics software is used for the analysis of heat transfer and fluid dynamics. Chemical kinetics of the reactions are modeled by a basic kinetics model. Numerical results are validated using experimental data carried out in similar operating conditions. They are in good agreement since the deviation between them does not exceed 6%. Isotherms, velocity fields, and isobars are evaluated within the reactor as well as velocity and distribution of particles. These amounts are influenced by the imposed heat flux at the lateral wall (q0). Also, it has been shown that the temperature and pressure values reached are above those required by the HTC process and, consequently, a HTC reactor could be designed with optimal operating conditions.

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“…El-Kaddadi et al [70] studied the characteristics of convective heat transfer using TiO 2 water-based nanofluid for a heat storage cycle of charging and discharging in a vertical cylindrical system.…”

Section: Experimental Setups For Forced Convection Under Laminar and Turbulent Regimesmentioning

confidence: 99%

“…At Re = 5268, the convective heat transfer increased from 7% and 25% for nanofluid with volume concentration of 1% and 3%, respectively.The works reported so far have been compared by means of Tables4 and 5, where it is evident the diversity of investigations carried out and, above all, the dispersion of the results that often are very hard to compare. For this purpose, in the next section, a selection of comparable works is taken, to show, in graphical representations, the obtained results.El-Kaddadi et al[70] studied the characteristics of convective heat transfer using TiO 2 water-based nanofluid for a heat storage cycle of charging and discharging in a vertical cylindrical system.…”

mentioning

confidence: 99%

A Critical Review of Experimental Investigations about Convective Heat Transfer Characteristics of Nanofluids under Turbulent and Laminar Regimes with a Focus on the Experimental Setup

et al. 2021

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In this study, several experimental investigations on the effects of nanofluids on the convective heat transfer coefficient in laminar and turbulent conditions were analyzed. The aim of this work is to provide an overview of the thermal performance achieved with the use of nanofluids in various experimental systems. This review covers both forced and natural convection phenomena, with a focus on the different experimental setups used to carry out the experimental campaigns. When possible, a comparison was performed between different experimental campaigns to provide an analysis of the possible common points and differences. A significant increase in the convective heat transfer coefficient was found by using nanofluids instead of traditional heat transfer fluids, in general, even with big data dispersion from one case to another that depended on boundary conditions and the particular experimental setup. In particular, a general trend shows that once a critic value of the Reynolds number or nanoparticle concentrations is reached, the heat transfer performance of the nanofluid decreases or has no appreciable improvement. As a research field still under development, nanofluids are expected to achieve even higher performance and their use will be crucial in many industrial and civil sectors to increase energy efficiency and, thus, mitigate the environmental impact.

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Experimental study of the sensible heat storage in the water/TiO2 nanofluid enclosed in an annular space

Cited by 26 publications

References 32 publications

Toward TiO2 Nanofluids—Part 2: Applications and Challenges

Toward TiO2 Nanofluids—Part 2: Applications and Challenges

Analysis of Fluid Flow and Heat Transfer inside a Batch Reactor for Hydrothermal Carbonization Process of a Biomass

A Critical Review of Experimental Investigations about Convective Heat Transfer Characteristics of Nanofluids under Turbulent and Laminar Regimes with a Focus on the Experimental Setup

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