Reinforced heat exchange tube with ribs arranged on inner surface and manufacturing method of reinforced heat exchange tube

Abstract

The invention discloses a reinforced heat exchange tube with ribs arranged on the inner surface. The outer surface of the reinforced heat exchange tube is a smooth and flat surface, the micro ribs areuniformly arranged on the inner surface, the section of each micro rib is a solid square, each micro rib extends in the radial direction to form a strip shape, and the included angle between each micro rib and the axis of a round tube is 0-90 degrees. A manufacturing method comprises the following steps that a pattern is firstly sealed and cut on the surface of a rolling wheel to serve as a die,then miniature square rib structures are formed on a steel belt by using the rolling wheel in a pressing manner, the steel belt is rolled into a round shape, and the round pipe is formed through welding. According to the reinforced heat exchange tube, heat exchange of single-phase fluid can be reinforced, and evaporation heat exchange can also be reinforced.

Description

technical field [0001] The invention relates to an enhanced heat exchange tube with ribs on the inner surface and a manufacturing method thereof, which belongs to the technical field of heat exchange tubes for industrial heat exchangers and is suitable for single-phase or evaporative heat exchange and gas-liquid two-phase flow heat exchangers. Background technique [0002] The inner threaded tube is a kind of enhanced single-phase, evaporation and two-phase flow heat exchange tube commonly used. There are many spiral fins (ribs) on the inner surface. The general theory is that when the fluid passes through, it is affected by the spiral fins. Due to the influence of fins (ribs), the fluid will also rotate with the extension direction of the spiral fins (ribs), so the flow boundary layer is destroyed, thus increasing the heat transfer effect. In order to further improve the heat transfer performance of the internally threaded pipe, internally threaded pipes with different stru...

AI Technical Summary

Problems solved by technology

The height of the protrusions on the inner surface of the ribbed tube is about 0.6mm-1.7mm, and the distance between the protrusions is 2.0-20.0mm; when the fluid passes over the protrusions, a transverse vortex will be generated between adjacent ribs, thus improving the exchange rate. Thermal coefficient, but due to the high bulge, it will cause pressure difference resistance or shape resistance after the bulge, so that in addition to friction resistance in the flow, pressure difference resistance will also be caused. Obviously, the resistance increases greatly, resulting in too much power consumption

Some data show that in the case of single-phase flow, the heat transfer coefficient is increased by 100%, but the resistance is increased by 300%.

When this kind of horizontal tube is used as an evaporative heat exchange tube, the efficiency is not significantly improved.

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