3-D Numerical Simulation Of Heat Transfer Process In Spirally Grooved Tube

The research on high-effective special shape tube for enhanced heattransfer is the most active and important research subject in heat transfer area.Spirally grooved tube is the important one of them. This kind of tube is formedby means of roll-pressing process on smooth tube through special formingdevice, and can be manufactured into many kinds of spirally flutes. The mainstructure parameters of spirally grooved tube are diameter of tube, fin pitch,corrugation depth, wall thickness, spirally angle and spirally numbers.In this paper, the theoretical analysis is discussed and the theoreticalmodels of convection process in spirally grooved tube and smooth tube are built.By applying ANSYS software, this paper studies convection process of heatexchanger in which the medium is water by three-dimension numericalsimulation.Firstly, the temperature distribution, the fluid flow state in heat exchangerin the course of heat transfer are calculated by means of multiple speciestransport technique, and the average convection coefficient of both sides isobtained. The relationship between structure and the average convectioncoefficient of both sides is summarized. The mechanism and feature ofaugmentation heat transfer is described. Compared with a smooth tube heatexchanger, the heat transfer characteristics of a Single-Start spirally groovedtube is higher.Secondly, results of numerical simulation and experimental results arecompared to validate reliability of numerical simulation. They are considered asbetter basis for further studies on convection process of spirally grooved tubeand can offer important theoretic dates for production.Lastly, applying the rule, the performance of some tubes are evaluated, andthe reasonable optimization scheme is obtained.