Influence of twisted tape length on the thermal performance of a heat exchanger tube
J. P. Panda, Bipin Kumar, Manoj Kumar, Anil Kumar Patil
Abstract
The application of twisted tape inserts in heat exchangers allows higher heat transfer rates with a simultaneous loss of energy due to turbulence and friction. In a conventional approach, the twisted tape is placed in the entire length of the heat exchanger. The present study explores the effect of the length of the twisted tape insert at a different twist ratio (TR) for 4700 < Re < 22,800. The insert length ratio (LR) ranges from 0.25 to 1 and the TR ranges from 1.5 to 6. The maximum Nusselt number corresponds to the LR of 0.75 at a TR of 1.5. The maximum thermo-hydraulic performance is found to be 3.2 for the LR of 0.75 at a TR of 1.5.
Topics & Concepts
Nusselt numberHeat exchangerInsert (composites)Materials scienceHeat transferTurbulenceTube (container)Concentric tube heat exchangerHeat transfer enhancementMechanicsComposite materialTwistThermodynamicsHeat transfer coefficientPlate heat exchangerReynolds numberPhysicsGeometryMathematicsHeat Transfer and OptimizationHeat Transfer MechanismsNanofluid Flow and Heat Transfer