A comparative study on entropy generation of some nanofluids


Uysal C.

6. International Congress on Vocational and Technical Sciences, Iğdır, Türkiye, 11 - 12 Nisan 2019, ss.476-488

  • Basıldığı Şehir: Iğdır
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayısı: ss.476-488

Özet

The convective heat transfer and fluid flow characteristics of copper oxide-water,
diamond-water, silver-water and titanium dioxide-water nanofluids are numerically
investigated and their entropy generation rates are presented and compared. The nanoparticle
volume fractions of nanofluids are 4.0% and the flow is considered under single-phase, threedimensional,
steady-state, incompressible and laminar flow conditions. The finite volume
method is used in the numerical computation. The highest and the lowest convective heat
transfer coefficient values are obtained for diamond-water nanofluid and pure water,
respectively. The highest and the lowest pressure drop values are obtained for diamond-water
and silver-water nanofluids, respectively. The diamond-water nanofluid has the lowest total
entropy generation rate, while the pure water has the highest total entropy generation rate. At
Re=100, the Bejan number values obtained for all working fluids investigated in this study are
almost equal to unity.