TY - JOUR
T1 - Improving heat transfer of stabilised thermal oil-based tin nanofluids using biosurfactant and molecular layer deposition
AU - Gil-Font, Javier
AU - Hatte, Marie Anne
AU - Bailey, Maximilian R.
AU - Navarrete, Nuria
AU - Ventura-Espinosa, Jorge
AU - Goulas, Aristeidis
AU - La Zara, Damiano
AU - van Ommen, J. Ruud
AU - Mondragón, Rosa
AU - More Authors, null
PY - 2020
Y1 - 2020
N2 - The development of advanced heat transfer fluids (HTF) with enhanced heat transfer properties has been identified as a key target to increase the efficiency of industrial processes. In this work, heat transfer performance improvements of a novel nanofluid, consisting of metallic nanoparticles dispersed in a commercial thermal oil, were investigated. Nanofluids combining tin nanoparticles (1 mass %) with Therminol 66 (TH66) were synthesised using the two step-method and experimentally analysed. The effectiveness of biosurfactant addition and nanoparticle polyethylene terephthalate (PET) nanocoating for high temperature nanofluid stabilisation were independently investigated. The PET nanoscale coatings were grown by molecular layer deposition, which has been used for the first time in this field. The thermal conductivity, dynamic viscosity and specific heat capacity of the stable, oil-based nanofluids were characterised at high temperatures, and the results were compared and in good agreement with models found in the relevant literature. Finally, the heat transfer performance of the nanofluids with respect to their base fluids was evaluated, employing empirical values for the thermophysical properties of the involved materials. In this way, increments of the heat transfer coefficients up to 9.3% at 140 °C, relevant to industrial applications were obtained.
AB - The development of advanced heat transfer fluids (HTF) with enhanced heat transfer properties has been identified as a key target to increase the efficiency of industrial processes. In this work, heat transfer performance improvements of a novel nanofluid, consisting of metallic nanoparticles dispersed in a commercial thermal oil, were investigated. Nanofluids combining tin nanoparticles (1 mass %) with Therminol 66 (TH66) were synthesised using the two step-method and experimentally analysed. The effectiveness of biosurfactant addition and nanoparticle polyethylene terephthalate (PET) nanocoating for high temperature nanofluid stabilisation were independently investigated. The PET nanoscale coatings were grown by molecular layer deposition, which has been used for the first time in this field. The thermal conductivity, dynamic viscosity and specific heat capacity of the stable, oil-based nanofluids were characterised at high temperatures, and the results were compared and in good agreement with models found in the relevant literature. Finally, the heat transfer performance of the nanofluids with respect to their base fluids was evaluated, employing empirical values for the thermophysical properties of the involved materials. In this way, increments of the heat transfer coefficients up to 9.3% at 140 °C, relevant to industrial applications were obtained.
KW - Biosurfactant
KW - Heat transfer
KW - High temperature stability
KW - Molecular layer deposition
KW - Nanofluid
KW - Thermal oil
UR - http://www.scopus.com/inward/record.url?scp=85086865532&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2020.115559
DO - 10.1016/j.applthermaleng.2020.115559
M3 - Article
AN - SCOPUS:85086865532
SN - 1359-4311
VL - 178
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
M1 - 115559
ER -