2 results listed
This study investigates the heat transfer
enhancements of CuO nanofluid according to nanoparticle size.
For maximum heat transfer enhancement, optimum nanoparticle
diameter is going to be found. In this numerical study, forced
convection nanofluid flow in a 0.01-m x 0.01-m cross-sectioned
and 3-m long square duct under turbulent flow regime was
investigated. Constant heat flux of 20 kW/m2 was applied to the
surfaces of the duct. CuO/water nanofluid was used in analyses
to enhance the convective heat transfer of the base fluid.
Thermo-physical properties of nanofluid are constant. Analyses
were performed for Reynolds numbers between 104 and 105, also
for volume concentrations between 0% and 4%. The finite
volume discretization method was used to solve the governing
equations. Single phase model was considered. Thermophysical
properties of the nanofluid were found thanks to the single phase
correlations which depended on nanoparticle diameter. The
effects of nanoparticle diameter on velocity distribution, average
Nusselt number, and average Darcy friction factor were
investigated in detail. The results indicate that higher volume
concentrations of CuO/water nanofluid offers more average
convective heat transfer enhancement. Higher nanoparticle size
nanofluids offer lower enhancement
1.st International Conference Energy Systems Engineering
ıcese'17
Mutlu TEKİR
Recep EKİCİLER
Kamil ARSLAN
For this experiment, a spark ignition engine designed
to use gasoline has been modified to use LPG, so it has become
bi-fuel engine. Catalyst temperature for different speeds and
engine loads is evaluated. Thanks to an OBD2 diagnostic
interface and its specific software, a handful of sensors of the car
can be reached.
It is widely accepted that LPG causes overheating of engine, and
so LPG converted engines have lower lifespan. In order to
evaluate the effect of LPG on catalyst, catalyst temperatures are
used. Experiments are executed under real life driving
conditions, on a straight track at various speeds using cruise
control feature for more accuracy.
The results indicate that there isn’t any significant temperature
increase when the engine is running on LPG. Most important
reasons of increasing temperature in cylinders are incorrect
air/fuel ratio under LPG operating conditions, and lack of
control over advance timing on LPG. Reasons of this are going to
be discussed further
1.st International Conference Energy Systems Engineering
ıcese'17
Mutlu TEKİR