Simulation of heat transfer enhancement in nanofluids using dissipative particle dynamics

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Abstract

The current paper applied dissipative particle dynamics (DPD) approach to investigate heat transfer within nanofluids. The DPD approach was applied to study natural convection in a differential heated enclosure by considering the viscosity and the thermal conductivity of the nanofluid to be dual function of temperature and volume fraction of nanoparticles. Experimental data for viscosity and thermal conductivity are incorporated in the current DPD model to mimic energy transport within nanofluids. This incorporation is done through the modification of the dissipative weighting function that appears in the dissipative force vector and the dissipative heat flux. For the entire range of Rayleigh number considered in this study, it was found that the DPD results show a deterioration in heat transfer in the enclosure due to the presence of nanoparticles for φ 0.25 > 0.25 4%. However, some slight enhancement is shown to take place for small volume fraction of nanoparticles, φ 0.25 ≤ 0.25 4%. The DPD results experienced some degree of compressibility at high values of Rayleigh number Ra ≥ 0.10 105.

Original languageBritish English
Pages (from-to)1-11
Number of pages11
JournalInternational Communications in Heat and Mass Transfer
Volume85
DOIs
StatePublished - 1 Jul 2017

Keywords

  • Dissipative particle dynamics
  • Nanofluid
  • Natural convection
  • Variable thermal conductivity
  • Variable viscosity

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