Heat Transfer Enhancement Mechanism And Experimental Research Of Tube Side Assembled Rotors

The heat exchanger is the universal application of the general equipment in thepetrochemical, light industry, metallurgy and electric power industry. It occupies animportant position in the industry, but most of the heat exchanger equipment face thedifficulty of low heat transfer efficiency, low energy consumption and frequentcleaning. This paper proposed heat transfer enhancement technique of a combinationrotor in tube side on the basis of preliminary study, namely the composite rotor whichinserted within the heat exchanger tube side, flow under impact rotor rotationdisturbance along the entire heat transfer tube to the formation of non-attenuation swirland turbulence, thereby increasing the heat transfer performance, and to preventdeposition of dirt in the inner wall surface with self-cleaning effect. The technology issimple in structure, required small drive torque and high speed, more intense the heattransfer medium disturbance, and without destruction of the original heat exchangerstructure which has broad application prospects in the field of heat exchanger.This thesis develops a shell and tube heat exchanger experimental platform, designsand molds different type of engineering plastics rotor structure, researches on the heattransfer performance and pressure drop characteristics of the system by means ofnumerical simulation experiments, the main research are as follows:1. Developed a combination rotor of tube side heat transfer enhancement experimentplatform and take advantage of the visualization technology of this system, on this basis, the manufacturing process of the rotor were discussed.2. Using FLUNT software to simulate the built-in combination rotor in heat transfertube, and its velocity distribution, pressure distribution, temperature distribution werecalculated, and compared with plain tube, in-depth analysis of the model enhancedmass thermal mechanism, provided a basis for optimization design of shell and tubeheat exchanger equipment.3. Designed different types of rotor structure, strengthen the heat transferexperimental apparatus in the heat transfer experiments in the development of theprocess combination rotor, rotor structural parameters and the flow field changes theheat transfer coefficient, and its resistance characteristics were analyzed.4. Discussed the cleaning action mechanism of combination rotor in tube side, andestablished the theoretical foundation for industrial application.