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Experiments on thermal properties of ionic liquid enhanced with alumina nanoparticles for solar applications

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Abstract

Ionanofluids (INF) are combinations of ionic liquid (IL) and nanoparticles (NP) with superior thermophysical properties. In the present study, measurement of thermophysical profile of IL, 1-ethyl-3-methylimidazolium chloride ([EMiM]Cl) in which Al2O3 NPs are dispersed were undertaken in the temperature range of 303.15–333.15 K. INFs were prepared by dispersing Al2O3 NPs in different mass concentrations of 0.5, 1.0, 2.5, 5.0, and 10%. The results showed that specific heat and thermal conductivity increase with both concentration and temperature. In contrast, the viscosity and density increase with concentration and decrease with temperature rise. The maximum INF thermal conductivity and viscosity enhancements were 21.9% and 77.6% for a mass concentration of 10% compared to IL at 333.15 K and 303.15 K. Electrical conductivity decreases with NP addition and increases linearly with an increment in temperature. Based on the measured results, a correlation for the specific heat, thermal conductivity, and viscosity of INF was proposed. Further, the heat transfer performance of studied INF is theoretically estimated based on the experimental thermophysical properties. Finally, for high-temperature applications methylimidazolium chloride-based INFs can be used as an efficient candidate as primary heat transfer fluid.

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Abbreviations

[BMIM][BF4]:

1-Butyl-3-methylimidazolium tetrafluoroborate

C p :

Specific heat (J kg−1 K−1)

[C2mim][CH3SO3]:

1-Ethyl-3-methylimidazolium methanesulfonate

[C4mim][NTf2]:

1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide

[C4mpyrr][NTf2]:

N-Butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide

[C4mmim][NTf2]:

1-Butyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide

EC:

Electrical conductivity

FESEM:

Field emission scanning electron microscope

[HMIM] [BF4]:

1-Hexyl-3-methylimidazolium tetrafluoroborate

IL:

Ionic liquid

INF:

Ionanofluid

ILF:

Internal laminar flow

ITF:

Internal turbulent flow

k :

Thermal conductivity (W m−1 K−1)

[N4111][NTf2]:

Butyl trimethylammonium bis(trifluoromethylsulfonyl) imide

m :

Mass fraction

Q :

Heat input

T :

Temperature

v :

Volume

Δ :

Uncertainty

ρ :

Density (kg m−3)

φ :

Mass fraction

μ :

Viscosity (mPa s)

bf:

Base fluid

nf:

Nanofluid

p:

Particle

vol:

Volume (%)

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Authors and Affiliations

  1. Department of Mechanical Engineering, IIT Madras, Chennai, Tamilnadu, India

    Praveen Kumar Kanti

  2. Technical University “Gheorghe Asachi” of Iasi, Iasi, Romania

    Elena Ionela Chereches & Alina Adriana Minea

  3. Center for Energy Studies, Department of Mechanical Engineering, JNTUH College of Engineering, Kukatpally, Hyderabad, Telangana, India

    K. V. Sharma

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Kanti, P.K., Chereches, E.I., Minea, A.A. et al. Experiments on thermal properties of ionic liquid enhanced with alumina nanoparticles for solar applications. J Therm Anal Calorim 147, 13027–13038 (2022). https://doi.org/10.1007/s10973-022-11534-x

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