What materials can be used to construct heat pipes

The larger cross-sectional area of the heat pipe (i.e. the larger diameter of the heat pipe) will allow a larger amount of steam to be transferred from the evaporator to the condenser. The cross-sectional area of the heat pipe is a direct function of the acoustic limit and entrainment limit of the heat pipe. However, the working temperature of the heat pipe will also affect the acoustic limit of the heat pipe. What materials can be used to construct heat pipes.

Specific working fluids can only function in certain temperature ranges. Moreover, a specific working fluid requires a compatible container material to prevent corrosion or chemical reaction between the fluid and the container, because corrosion will damage the container and the chemical reaction will produce non condensable gas.

Liquid ammonia heat pipe has been widely used in space, and only aluminum containers are used because of its light weight. The temperature range of the water heat pipe is 5 to 230 ° C, which is most effective for electronic cooling applications, and the copper container is compatible with water.

When the heat pipe temperature is lower than the freezing point of the working fluid, the heat pipe will not work. Freezing and thawing is a design problem, which may destroy the sealed joint of heat pipe when placed vertically. Proper engineering and design can overcome this limitation.