TY - JOUR
TI - The effect of volume fraction of SiO2 nanoparticle on flow and heat transfer characteristics in a duct with corrugated backward-facing step
AU - Ekiciler Recep
AU - Aydeniz Emre
AU - Arslan Kamil
JN - Thermal Science
PY - 2018
VL - 22
IS - 15
SP - 1435
EP - 1447
PT - Article
AB - In this paper, flow and heat transfer characteristics of SiO2-water nanofluid  flow over a corrugated backward-facing step are numerically investigated. The  numerical study is performed by solving governing equations (continuity,  momentum, and energy) with finite volume method. The duct inlet and step  heights are 4.8 mm. The expansion ratio is 2. The upstream wall, Lu, and  downstream wall, Ld, lengths are 48 cm and 96 cm, respectively. The  downstream wall of the duct is subjected to a constant and uniform heat flux  of 2000 W/m2. The ranges of the volume fraction of nanoparticles and Reynolds  number are 0%-3.0% and 135-240, respectively. The effects of the volume  fraction of nanoparticles on the average Nusselt number, average Darcy  friction factor, and velocity distribution are investigated under laminar  forced convective nanofluid flow condition. It is revealed that the  nanoparticle volume fraction substantially influences the heat transfer and  flow characteristics. The volume fraction of 3.0% shows the highest heat  transfer performance.