Simultaneous use of TiO2/oil nanofluid and metallic-insert as enhancement of an evacuated tube solar water heater

Lotfi, Marzieh; Firoozzadeh, Mohammad; Ali-Sinaei, Mostafa

doi:10.1007/s10973-023-12339-2

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J Therm Anal Calorim

2023

DOI: 10.1007/s10973-023-12339-2

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Simultaneous use of TiO2/oil nanofluid and metallic-insert as enhancement of an evacuated tube solar water heater

Marzieh Lotfi,

Mohammad Firoozzadeh,

Mostafa Ali-Sinaei

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2024

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Thermo-hydraulic and entropy generation analysis of nanofluid flow with variable properties in various duct cross sections: a 3-D two-phase approach

Varma,

Nidhul

2024

J Therm Anal Calorim

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A three-dimensional computational fluid dynamics (CFD) study is carried out to explore the effect of duct cross section on the thermo-hydraulic performance of various ducts. A finite volume-based scheme with an SST k-omega model and mixture model (two-phase model) was used to obtain more realistic results. A two-phase mixture model was used to consider the movement between base fluid and nanoparticles. Al2O3 nanoparticle having a volume fraction of 0.01% and 42 nm as particle size, the heat transfer and friction factor characteristic are studied for turbulent flow regime (3000 < Re < 9000) with variable thermo-physical properties. A maximum enhancement of 86% in heat transfer rate is obtained for the serpentine duct compared to the conventional circular duct at Re = 4500. Owing to a significantly lower increase in pressure drop, the elliptical duct has the highest thermo-hydraulic performance parameter of 1.54 relative to the circular duct. Further, to analyze the heat transfer quality, the entropy generation rate is studied, and it is observed that the square duct reported the highest with an increase of 60% and the elliptical duct the lowest with a reduction of 54% relative to the circular duct. This study can aid in choosing the duct geometry to enhance the heat transfer rate with nanofluid for applications such as solar-thermal, heat exchangers, etc.

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Thermo-hydraulic and entropy generation analysis of nanofluid flow with variable properties in various duct cross sections: a 3-D two-phase approach

Varma,

Nidhul

2024

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

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Simultaneous use of TiO2/oil nanofluid and metallic-insert as enhancement of an evacuated tube solar water heater

Cited by 1 publication

References 39 publications

Thermo-hydraulic and entropy generation analysis of nanofluid flow with variable properties in various duct cross sections: a 3-D two-phase approach

Thermo-hydraulic and entropy generation analysis of nanofluid flow with variable properties in various duct cross sections: a 3-D two-phase approach

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