Numerical Investigation on Heat Transfer Enhancement and Flow Characteristics in a Tube Equipped by Twisted tape with Alternate Axis

In this study, effects of inserting twisted tape to a horizontal tube on heat transfer enhancement performance and flow characteristics is investigated with using a CFD program. The CFD program is based on finite volume technique to solve differential equations. The continuity, momentum and energy equations are discretized and Simple algorithm scheme is applied to link the pressure and velocity fields inside the solution domain. Analyses are carried out with Reynolds number of in range from 10,000 to 30,000, and constant heat flux is applied to wall of the tube. In order to simulate turbulent nanofluid flow k-ω standard turbulent model is applied for all cases. The numerical methodology is validated with literature in order to prove the accuracy of the study. The twisted tape configurations consist with various alternate axis. The results show that increase in turn amount of alternate axis provides higher heat transfer enhancement compared to typical twisted tape. However, used of the twisted tape with alternate axis more increase pressure drop penalty compared to typical twisted tape.