Numerical hydrothermal analysis of water-Al2O3 nanofluid forced convection in a narrow annulus filled by porous medium considering variable properties

Mashaei, Payam Rahim; Shahryari, Mehran; Madani, S.

doi:10.1007/s10973-016-5550-3

Cited by 36 publications

(5 citation statements)

References 63 publications

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“…In the present investigation and can be any temperature-independent models for the ratios of viscosity and thermal conductivity of nanofluid to those of the base fluid, respectively. Two commonly used empirical models are chosen here [46][47] [15]:…”

Section: Governing Equationsmentioning

confidence: 99%

Effects of nanofluid and radiative heat transfer on the double-diffusive forced convection in microreactors

Govone

Torabi

Wang

et al. 2018

J Therm Anal Calorim

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Understanding transport phenomena in microreactors remains challenging owing to the peculiar transfer features of microstructure devices and their interactions with chemistry. This paper, therefore, theoretically investigates heat and mass transfer in microreactors consisting of porous microchannels with thick walls, typical of real microreactors. To analyse the porous section of the microchannel the local thermal non-equilibrium model of thermal transport in porous media is employed. A first order, catalytic chemical reaction is implemented on the internal walls of the microchannel to establish the mass transfer boundary conditions. The effects of thermal radiation and nanofluid flow within the microreactor are then included within the governing equations. Further, the species concentration fields are coupled with that of the nanofluid temperature through considering the Soret effect. A semi-analytical methodology is used to tackle the resultant mathematical model with two different thermal boundary conditions.Temperature and species concentration fields as well as Nusselt number for the hot wall are reported versus various parameters such as porosity, radiation parameter and volumetric concentration of nanoparticles. The results show that radiative heat transfer imparts noticeable effects upon the temperature fields and consequently Nusselt number of the system. Importantly, it is observed that the radiation effects can lead to the development of a bifurcation in the nanofluid and porous solid phases and significantly influence the concentration field. This highlights the importance of including thermal radiation in thermo-chemical simulations of microreactors.

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Section: Governing Equationsmentioning

confidence: 99%

Effects of nanofluid and radiative heat transfer on the double-diffusive forced convection in microreactors

Govone

Torabi

Wang

et al. 2018

J Therm Anal Calorim

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“…[21][22][23][24]. Heat transfer enhancement by employing nanofluids is mainly attributed to its higher thermal conductivity in comparison with conventional fluids [25][26][27]. Increase in the thermal conductivity of these fluids is due to dispersion of solid nanostructures which have higher thermal conductivity compared with liquids [28].…”

Section: Introductionmentioning

confidence: 99%

Applications of nanofluids in geothermal: A review

Ahmadi¹,

Ramezanizadeh²,

Nazari³

et al. 2018

MMEP

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Geothermal energy is one of the most suitable sources of energy since it is possible to use it continuously for generating power and providing heat. Firstly, recent trends in geothermal energy are discussed and compared with other types of renewable energies. According to the results of this section, geothermal energy is an attractive choice for future power generation due to its low carbon dioxide emission and levelzied cost of electricity in comparison with other renewable energy sources. Afterwards, applications of nanofluid in geothermal-based energy systems are reviewed and their important results are represented. On the basis of literature review, using nanofluids can result in augment in geothermal systems. The enhancement is dependent on several factors including the type of nanofluid, concentration and system specification. According to the results of a study, the effect of using nanofluid on heat transfer rate became more significant at higher flow rates. In addition, using nanofluids can reduce the size of heat exchangers used in geothermal-based system. The main effects of employing nanofluids is increase in convective heat transfer and pressure loss.

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“…In their work they examined both 1% and 2% alumina and noted an improvement in the heat transfer coefficient of 5.86% and 8.49% respectively when compared to the enhancement of pure water. Additional numerical work with high concentration nanofluid was undertaken by Mashaei et al [23] who numerically examined the use of high concentration aqueous Al2O3 nanofluid in a heat pipe model. They modeled 2%, 4%, and 6% nanofluids in a porously filled heat pipe to examine the impact on temperature uniformity at the wall of the pipe.…”

Section: Literature Reviewmentioning

confidence: 99%

Numerical and experimental investigation into the impact of cu/al2o3 hybrid nanofluid and higher concentration alumina nanofluids on heat transfer in a two and three-channel heat exchanger

Plant

2023

Preprint

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The following work was conducted both numerically and experimentally with two nanofluid types being investigated. The first being a Cu/Al2O3 2O3 hybrid nanofluid with an aluminum oxide nanostructure decorated in copper oxide nanostructures, and the latter being two higher concentration alumina nanofluids, 1% vol and 2% vol created through dilution of a stock fluid in distilled water. Both nanofluids were tested in a fluid flow system filled with an open-cell foam metal. The porous media is comprised of a 6061-T6 aluminum with a permeability of 9.54788× 10−7 m2 for the hybrid nanofluid and a permeability of 2.3869 x 10-7 m2 for the high concentration alumina nanofluid, with both porous media blocks used in the investigation having a porosity of 0.91. The experiments were conducted with varying heat flux. The performance of the nanofluids was evaluated by examining changes in the Nusselt number. The copper oxide/alumina nanocomposite in conjunction with the porous media, resulted in a significant enhancement of 6-11% compared to the commercially available alumina nanofluid, The high concentration alumina saw an average thermal enhancement of 15.6% of the 1% vol nanofluid over the 2% vol.

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Numerical hydrothermal analysis of water-Al2O3 nanofluid forced convection in a narrow annulus filled by porous medium considering variable properties

Cited by 36 publications

References 63 publications

Effects of nanofluid and radiative heat transfer on the double-diffusive forced convection in microreactors

Effects of nanofluid and radiative heat transfer on the double-diffusive forced convection in microreactors

Applications of nanofluids in geothermal: A review

Numerical and experimental investigation into the impact of cu/al2o3 hybrid nanofluid and higher concentration alumina nanofluids on heat transfer in a two and three-channel heat exchanger

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