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Stability and thermophysical properties of fly ash nanofluid for heat transfer applications
Author(s) -
Kanti Praveen,
Sharma K. V.,
Ramachandra C. G.,
Panitapu Bhramara
Publication year - 2020
Publication title -
heat transfer
Language(s) - English
Resource type - Journals
eISSN - 2688-4542
pISSN - 2688-4534
DOI - 10.1002/htj.21849
Subject(s) - nanofluid , thermal conductivity , materials science , viscosity , heat transfer , dynamic light scattering , fly ash , zeta potential , thermodynamics , nanoparticle , chemical engineering , composite material , nanotechnology , physics , engineering
Improving the performance of heat transfer fluids is altogether significant. The best approach for improving the thermal conductivity is the addition of nanoparticles to the base fluid. In the present study, specific heat, dynamic viscosity, and thermal conductivity of water‐based Indian coal fly ash stable nanofluid for 0.1% to 0.5% volume concentration in the temperature range of 30 to 60°C has been investigated. To evaluate an average particle diameter of 11.5 nm, the fly ash nanoparticles were characterized with scanning electron microscopy and dynamic light scattering. Using zeta potential, the stability of nanofluid in the presence of surfactant Triton X‐100 was tested. Thermal conductivity and viscosity of fly ash nanofluid increased, while specific heat decreased as volume concentration increased. The effect of temperature on the fly ash nanofluid was directly proportional to its thermal conductivity and specific heat and inversely proportional to viscosity.