Flat heat pipe having a gradient wetting structure

A flat heat pipe having a gradient wetting structure, comprising a bottom plate, a top plate, and a support plate located between the bottom plate and the top plate, there are two support plates, and the bottom plate, the top plate and support plates on both sides are connected to form a seal chamber;

• a micron-level radial strip is processed on an inner surface of the bottom plate, presenting a wetting gradient that changes uniformly from a center to the circumference of a circle, which is used to transport liquid and collect condensate without a pump in the direction of a center of the circle;
• the inner surface of the top plate is processed with superhydrophilic and superhydrophobic radial structures arranged at intervals to transport the condensate to a direction of a surrounding pipe wall;
• and a wick is arranged on the inner side of the support plates.