In this paper, effects of temperature-dependent thermophysical properties on laminar forced convection effectiveness of Al2O3-water nanofluids in a circular tube imposed to a constant heat flux are investigated numerically. The numerical study is supplemented with a scale analysis based on the integral energy equation. The analysis is conducted for various inlet temperatures and considering two cases for properties including (i) constant-properties, and (ii) temperature-dependent properties. The simulated results are presented for three different concentrations of nanofluids i.e. 0%, 5%, and 9%, volume flow rates in the range of 24-180 cm3/min which correspond with Reynolds numbers between 120 and 2000, heat fluxes between 5.51 × 102 and 1.23 × 104 W/m2, and various inlet temperatures in the range of 25-50 °C. The effects of various inlet temperatures of nanofluids and different thermophysical models on the local and average Nusselt numbers in the tube have been investigated in details. It is found that with an increase in both nanofluid concentration and temperature rise in the heated section, the effects of inlet temperature and thermophysical properties on the Nusselt number are more pronounced.
|Number of pages||18|
|Journal||International Journal of Heat and Mass Transfer|
|Publication status||Published - 2016 Sep 1|
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes