Intelligent surface heat exchange tube with hydrophilic and hydrophobic conversion function and control system of intelligent surface heat exchange tube

Abstract

The invention provides a hydrophilic and hydrophobic conversion intelligent surface heat exchange tube and a control system thereof, the inner surface of a base tube is divided into a spacer region and an intelligent surface region in the circumferential direction, an insulating layer I, a conductive layer, a porous layer and an insulating layer II are sequentially constructed in the intelligent surface region from the inner wall of the tube, and finally hydrophobic groups are electrified and sprayed on the insulating layer II. The exterior of the base tube is divided into a plurality of sections at equal intervals, thermocouples are welded to the upper end and the lower end of each section to monitor the temperatures of the upper end and the lower end of the section, the temperatures are fed back to a computer, and the computer adjusts currents of all the channels of the multi-channel direct-current power source to enable charged hydrophobic groups to move. And the inner surface of the pipe is subjected to hydrophilic-hydrophobic conversion in a spatio-temporal level. In the heat exchange process of the heat exchange tube, wettability transformation of the inner surface of the tube can be achieved according to different flow patterns, phase distribution in the tube is regulated and controlled, a multiphase flow structure and heat transfer are coordinated, and the heat transfer effect is improved.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to an intelligent surface heat exchange tube with hydrophilic-hydrophobic conversion and a control system thereof. Background technique [0002] As an efficient energy transfer method, phase change heat transfer is widely used in various aspects of industrial applications and production and life. Through the dynamic changes of vapor-liquid phase change from the initial nucleation to the final detachment of bubbles\droplets, it can be divided into Both condensation heat transfer and boiling heat transfer. [0003] However, in boiling / condensing heat transfer, as the vapor-liquid phase transition process of the heat exchange tube continues, the requirements for surface properties are different at different stages. [0004] In the condensation heat transfer process, the hydrophilic surface with high surface energy can reduce the vapor nucleation energy and promote the droplet ...

AI Technical Summary

Problems solved by technology

At the same time, due to the effect of gravity in the tube, the liquid film on the upper tube wall is distributed as "thin at the top and thick at the bottom". During the heat exchange process, it is difficult to replenish the liquid on the upper wall. Dry out, heat transfer process deteriorates

[0006] Strengthening the vapor-liquid phase transition has always been a key research content in the field

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