SIMULATION OF LAMINAR FORCED CONVECTION HEAT TRANSFER AND FLUID FLOW OVER A BACKWARD FACING STEP WITH OBSTACLE USING (SIO ) NANOPARTICLES

Abstract

 Simulation of Heat transfer and laminar Sio
Southern Technical University/ Al-Nassiriyah Technical Institute Department of Mechanical Techniques
Ahmedalbadry82@yahoo.com
2
/water and Sio
/oil-engine flow over
backward facing step with and without obstacle numerically studied in this paper. The finite
volume method adopted to solve continuity, momentum and energy equations in two
dimensions. The aspect ratio of triangular obstacle w/e = 0.5 presented. The step height and
expansion ratio of channel were 4.8
mm
2
and 2 respectively, the range of Reynolds number
varied from 100 to 250, constant heat flux subjected on downstream of wall was
2000W/m
2
.Two types of base fluid used in this simulation the water and oil-engine with
constant properties at T = 300K°, The Sio
nanoparticles used with nanoparticles diameter
30nm and volume friction 4%. The average nusselt number noticed increase with increase
Reynolds number with obstacle for two basefluid and also noticed that the nanofluid of Sio
2
oil engine has higher nusselt number compared with other nonofluid. The result shows
increase of local nusselt number for backward facing step with obstacle in compared to those
without obstacle. The maximum enhancement of heat transfer observed at obstacle due to
increase recirculation flow after the obstacle. Streamline showing the increase of recirculation
region with used obstacle in compared without obstacle and highest recirculation region
observed at obstacle