Preparation of uneven humid efficient phase changing coating and gravity assisted heat pipe device

Abstract

The invention discloses an uneven humid efficient phase changing coating preparation and a gravity assisted heat pipe device. The gravity assisted heat pipe device comprises a pipe body with two sealed ends; liquid working medium is poured into the pipe body; the upper portion of the pipe body is a condensation section, and the lower portion of the pipe body is an evaporation section; the inner top wall of the condensation section is a zigzag-shaped structure face; the uneven humid coating covers the inner side wall of the condensation section, the zigzag-shaped structure face and the inner bottom face of the evaporation section; the uneven humid coating comprises dewatering areas and hydrophilic areas; the uneven humid coating covering the zigzag-shaped structure face of the condensation section is of the structure that the straight stripes of the dewatering areas and the hydrophilic areas are distributed alternately; and the direction of the straight stripes is perpendicular to the zigzag grooves of the zigzag-shaped structure face. The gravity assisted heat pipe device can improve heat flux of an evaporation process and a condensation process remarkably. According to gravity assisted heat pipe device, depending on the operation rules of gravity assisted heat pipes, drawbacks existing in current gravity assisted heat pipes are overcome; working medium cycling speed is improved; and heat transfer load of the heat pipes is strengthened.

Description

technical field [0001] The invention relates to enhanced heat transfer and energy-saving technologies, in particular to the preparation of a non-uniform wettability high-efficiency phase-change coating and a gravity heat pipe device. Background technique [0002] Gravity heat pipe is composed of tube shell and working fluid. Its internal structure is divided into evaporation section, adiabatic section and condensation section from bottom to top. Compared with other types of heat pipes, since there is no liquid-absorbing core, it has a simple structure and is easy to process, so it is widely used in aerospace, military and other industries. Since it was introduced into the radiator manufacturing industry, people have changed the design ideas of traditional radiators. The commonly used gravity heat pipe is a closed gravity heat pipe. Its working principle is: first, a certain amount of working fluid is charged in the evaporation section, and the inside of the closed heat pip...

AI Technical Summary

Problems solved by technology

Existing research has improved the nucleation sites to enhance heat transfer by roughening the surface or constructing a porous structure, but the performance is still deteriorated under the condition of high heat flux, and the bubbles are still difficult to escape.

Another researcher improved the hydrophilicity by surface treatment, which can effectively drive away air bubbles and inhibit the formation of gas film, but instead reduces the nucleation density and affects the heat transfer effect.

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