Customized Bend Extruded finned tube are used to enhance the boiling heat transfer of the shell-side medium. The base tube is made of ordinary light heat pipe and rolled by rolling process without cutting. The U-shaped finned tube is formed by the plastic deformation of the metal on the surface of the blank tube to form fins, so it is named because its shape is similar to the English letter °C. The control parameters of the U-shaped finned tube processing process are the pitch and the opening between the fins. The commonly used pitch is 1-3mm and the opening is 0.

Customized Bend Extruded finned tube

l-0.4mm, wing height 0.9-1. 2mm. A regular U-shaped small groove is machined on the outer surface of the pipe, the upper opening of the groove is narrow, and the lower part is a circular groove. The liquid phase continuously permeates along the U-shaped channel wall through the slit, and the gas phase continuously emerges through the slit. The efficient liquid film evaporation in the U-shaped channel and the internal circulation of a large amount of liquid out of the channel are the mechanism of the U-shaped finned tube to enhance the boiling heat transfer.

U-shaped finned tube

The boiling heat transfer coefficient of steel U-shaped finned tube for industrial alcohol can be increased to 2-5 times that of the bare tube, and it can be increased to more than 2 times for light oil products. The advantage of the U-shaped finned tube is that the heat transfer performance is mainly controlled by the complex gas-liquid two-phase flow in the channel, and the boiling in the groove allows the gas to escape regularly. There is no vaporization at the top of the fins, and the air bubbles in the lower tube cannot wash the inner wall of the U-shaped channel, so the tubes do not interfere with each other, and the arrangement of the tubes has no effect on boiling.
At present, U-shaped finned tube reboilers have been widely used in industrial production, which not only improves heat transfer efficiency but also operates smoothly.