Compound intensified heat transfer pipe with internally installed twisting belts

Abstract

The invention relates to the technical field of intensified heat transfer of heat exchangers, and particularly relates to an intensified heat transfer pipe. A compound intensified heat transfer pipe with the internally installed twisting belts comprises a pipe body and the twisting belts internally installed in the pipe body, wherein one ends of the twisting belts, which are metal strips, are fixed, and the other free ends of the twisting belts rotate at a certain angle and length around the center lines of the twisting belts; and the twisting belts inside the pipe body are distributed by taking 180 degrees or 360 degrees as the period of rotation along the axial direction of the pipe body, a twisting belt unit is formed in each period, and a crossing angle between the two adjacent twisting belt units on the same twisting belt is 30 degrees to 90 degrees. The compound intensified heat transfer pipe with the internally installed twisting belts has the beneficial effects that the twisting belts inside the pipe body of the compound intensified heat transfer pipe form large longitudinal vortexes in the pipe central zone and the pipe wall zone, the longitudinal vortexes have the characteristics of low resistance and high efficiency, thus, the spanning high strength fluid displacement in the pipe can be implemented, and the effects of homogenizing a flow field and increasing the temperature gradient nearby the wall and the heat transfer rate of the pipe walls are achieved.

Description

technical field [0001] The invention relates to the technical field of enhanced heat transfer of heat exchangers, in particular to a composite enhanced heat transfer tube with a built-in twisted band. Background technique [0002] Since the oil crisis in the 1970s, heat transfer enhancement technology has been widely used in various industries for energy conservation and emission reduction, such as traditional main industries such as power, metallurgy, petroleum, and chemical industry, as well as high-tech industries such as aviation, electronics, and nuclear energy. Due to the needs of industrial production and the development of science and technology, heat transfer enhancement technology has received extensive attention and considerable development in recent decades. Heat transfer enhancement technology is divided into two types: active enhancement and passive enhancement according to whether it requires external work. Passive enhancement technology is more widely used be...

AI Technical Summary

Problems solved by technology

However, most of the twisted ribbons inserted into the existing smooth pipes use a single long twisted ribbon. The twisted ribbon has a single structure, which is extremely effective for laminar flow conditions, but for turbulent flow conditions (Re>10000), the power consumption per unit flow resistance The heat transfer rate is limited, and the comprehensive heat transfer performance is often lower than 1, especially at a large Reynolds number, and the comprehensive heat transfer performance is even lower.

Images