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Advantages of elliptical tube finned tubes

Elliptical tube finned tubes have many advantages and are lacking in research. The research on the internal and external characteristics and heat transfer law of elliptical tube fin tubes has been very comprehensive. Domestic and foreign scholars have done a lot of theoretical analysis, experimental research and numerical simulation. However, there are relatively few studies on flat tube finned tubes, especially for the study of temperature and velocity fields inside and outside the flat tube fin tubes. Although the air side resistance of the flat tube fin tube is relatively small and the heat transfer coefficient is high, the internal fluid resistance is relatively large, and the refrigerant charge amount is relatively small, which limits the application of the flat tube fin tube in the heat exchanger. Therefore, how to solve the problem of large internal flow resistance of the flat tube requires more and more in-depth research.
The elliptical tube finned tube is a heat exchanger composed of an elliptical tube and an outer fin. Elliptical rectangular finned tube, elliptical elliptical finned tube, elliptical circular finned tube, spiral elliptical flat tube, elliptical H finned tube, and the like. Elliptical elliptical tube finned tubes are widely used in industrial fields such as ethylene and oil refining. High-efficiency heat exchanger for elliptical finned elliptical tube finned tube. The flow resistance is small, the heat exchange efficiency is high, the heat exchanger is compact, the weight is light, the efficiency is high, and the miniaturization is achieved. Despite the many results of their research, there is still much to be done.
The air side of the finned tube heat exchanger is mainly convective heat transfer. The convection heat transfer enhancement technology can be divided into passive technology and active technology. Passive technology means no need to add extra power except for supporting the flow of fluid flow. Powered heat transfer mode, active technology refers to the way to rely on external power to achieve enhanced heat transfer. Passive enhancement techniques include: treatment of surfaces (surface treatment into porous or zigzag), rough surfaces, extended surfaces, spoiler elements, vortex generators, spiral tubes, surface tension elements (some special structures of heat transfer surfaces, such as Porous structure), additives (add special additives in the fluid, etc.); active strengthening technology mainly includes: mechanical agitation, surface vibration, fluid vibration, electromagnetic field, injection or suction, jet impact.