| Popis: |
Helical coils are very essential for various heat exchangers, nuclear reactors and in chemical engineering because of large quantity of heat transfer in a small space with high heat transfer rates and slight residence time dispersals even it suffers through a disadvantage of larger pressure drop. The curvature creates secondary flow arrangement which is perpendicular to main axial stream path. The secondary flow has insignificant capability to improve heat transfer owed to mingling of the fluid. The objective of this work is to compare and increase the pressure drop inside tapered helical coil heat exchanger in copper tube to succeed a better and more quantitative insight into heat transfer process by increasing secondary flow inside the coil and this can allow proper intermixing of the fluid and to maintain desired flow rate inside the helical coil. I work on CFD to analyze the helical coil by using ANSYS 15. Generation of 3D CAD model of aluminium and copper tapered helical tube of diameter (d) 10 mm keeping PCD 50 mm, pitch 20 mm , tapered angle 20 and length of 500 mm by using SOLIDWORKS and exporting to the IGES format and then import in ANSYS fluent 15 |
