The investigation of fully having baffles on its inner surface turbulent flow and heat transfer in circular duct

Effect of baffle geometry placed in a circular pipe is one of the most important parameter in investigating heat transfer and friction factor. In this study, flow geometry, mesh structure and numerical analysis were investigated by using ANSYS 12.0.1 package software program, after establishing hydrodynamically fully developed condition, change of Nusselt number and friction factor have been investigated for different number of baffle (n), baffle angle (?), distance between baffles (s) and fluid velocity in thermally developing turbulent flow conditions. In solutions air is used as a fluid, and Prandtl number is taken 0.7; the governing equations are solved in 3-dimensional flow conditions in uniform regime. The standard k-? turbulence model is used as a model. For flow conditions, Nusselt number and friction factor valuesare expressed as functions of Reynolds number in the form of Nu=aReb and f=cRed. Present results are compared with the literature results. It is seen that Nusselt number and friction factor obtained from numerical study have the lowest values for a smooth circular duct. However, it is also seen that Nusselt number and friction factor increase with increasing number of baffle (n), baffle angle (?), and distance between baffles (s). Nusselt number and friction factor increase with increasing Reynolds numbers as well.Key Words : Internal flow, turbulent, baffle, heat transfer, Ansys