Investigation of heat transfer enhancement of a circular tube fitted with a wire coil around a wire coil

Heat exchangers have overall use in nearly all major industries world enormous. Enhanced heat transfer performance and operational resilience are two very remarkable portions of newfangled heat exchangers. Effective use of heat exchangers in different industries requires exact resoluteness of heat transfer and pressure drop data. The main objective of this thesis work is to report thermo hydraulic performance evaluation of a commercial enhanced tube using numerical simulation techniques in a heat exchanger using ANSYS Fluent v17.A wire coil insert around a wire coil in tube heat exchanger was designed in SOLID WORKS 2014. The heat exchanger was configured. Steady state single phase analyses were performed to determine Nusselt number and friction factor. The enhancement of turbulent convective heat transfer inside pipes by means of wire coil insert around a wire coil as an augmented device is numerically studied. The test section consisted of a smooth tube of 510mm long and 16 mm diameter and length of the double wire coil insert is equal to 500 mm. The outer diameters of the wire coil insert around a wire coil insert are equal to the14.5mm and 14mm. Six different cases of circular, triangular, square of the wire coil insert around a wire coil were investigated. As a first design case, pipe diameter is 16 mm, secondary pitch coil diameter is 1.44 mm, and diameter of insert 14.5mm. As a second design case, pipe diameter is equal 16mm, secondary pitch coil diameter is 2.72 mm, and the insert diameter is 14mm. The range of Reynolds numbers was between 5000 and 25000. A constant heat flux technique was exposed to pipe wall in the test section. Results in the study range of Reynolds number showed that the Nusselt number of TW1 and TW2 were higher than a smooth pipe in the range of 72% to 191.247,and 70% to 175%, respectively For SW1 and SW2, results were in the range of 61.133% to 155.636 and 59.73% to 144%, and for CW1 and CW2, results were in the range of 49% to 124.13% and 46.851% to 107.382%, respectively. So the triangular section wire coil around a triangular section wire coil was given the highest ratio. Key words: wire coil insert around a wire coil, heat exchanger, ANSYS, heat transfer enhancement efficiency, CFD, wire coil.