Abstract
New configurations of helical obstacle were numerically investigated in this paper to reveal their effects on both thermal and hydrodynamics fields of flow in a straight circular tube. The obstacle height ratio (hr) of 0.125, 0.25 and 0.5 and helix pitch ratio (y) of 3, 5 and 10 were tested through the present effort. The fluid was air and it flowed with range of Reynolds number of 4000 ≤ Re ≤ 10,000 and the tube was under constant heat flux. ANSYS 17.1 was used and transition SST model was chosen to solve the problem. There is a significant increase in Nusselt number, friction factor and thermal performance factor was noticed as height ratio increased or helix pitch ratio decreased. All the obtained thermal performance factor from the studied cases were more than 1 and the higher one was 2.12 which obtained at hr and y of 0.5 and 3 respectively.
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