Numerical Simulation On Heat Transfer Enhancement And Field Synergy Analysis Of Threaded Spiral Tube

With the development of the human civilization and the social economy, the contradiction between the human rising energy consumption demand and the lack of energy is prominent day by day, the energy crisis has become the root of world peace crisis. The national strategy,economic and social stability will be influenced by the energy, for its strong political strategy and material properties, so more and more countries all over the world get the attention of seek sustainable energy development strategy and advanced technology for energy conservation and emission reduction in response to the current energy and environment problem. Threaded spiral pipe heat exchanger is a new high efficiency heat exchanger which is developed for the new situation of the industry requirements. The thread spiral pipe is used in the new heat exchanger, it is a new type of heat exchange components, but there are few research reports about it at present.Based on the computational fluid dynamics and the numerical heat transfer theory, established3D model of heat transfer and flow to the thread spiral pipe. By using the FLUENT software, in variety of fluid medium and broad Reynolds number range, made detailed numerical simulation research to the enhancement heat transfer and flow of the thread spiral pipes, to provide theoretical support for its practical application.On the first, by using the FLUENT software, made numerical simulation research to heat transfer and flow resistance performance of light tube, test the feasibility of the mathematical model and the calculation method, on the base of the feasibility, a large number of numerical simulation were made to the thread spiral pipes. Through process and analysis to the data, the paper discussed the Reynolds number,curvature,pitch,groove depth,slot and the physical parameters the influence on the heat transfer and the resistance performance of the thread spiral pipe, and a series of beneficial conclusion were obtained. By means of regression analysis, the experience formula of the heat transfer and resistance were obtained.Secondly, from the view of the velocity field and temperature field synergy, by using the field synergy principle of the heat transfer enhancement, analyzed the heat transfer enhancement internal mechanism of the thread spiral pipes. By using field synergy angle as the evaluation index of the heat transfer enhancement, the paper discussed the influence of the structure parameters on the thread spiral pipe field synergy performance. The results showed that the field synergy conclusions were completely consistent with the enhancement heat transfer and flow rule of the thread spiral pipes, it also from the point of the theoretical analysis method to prove the accuracy of the numerical simulation method.The paper also combined with field synergy principle analysis the fouling of the thread spiral pipes. The results showed that, under the same conditions, the thread spiral pipes have more superior resistance of scaling properties than the light tube. With the increase of fouling deposition thickness, the field synergy angle increased, proved that the heat exchange performance of the thread spiral pipes fall off. Fouling have seriously affected the heat transfer efficiency of the thread spiral pipes, the paper put forward three suggestions for the fouling prevention of heat exchange tubes, in order to improve the heat resistance components scaling properties.