Is it possible that you want to water-cool your heat pipes? You may be a powder sintered heat pipe, which can't be water-cooled.
Generally a heat pipe consists of a shell, a liquid absorbing core and an end cap. The inside of the heat pipe is pumped into a negative pressure state and filled with the appropriate liquid, which has a low boiling point and is easily volatilized. The wall of the tube has a liquid-absorbing core, which is composed of capillary porous material. One end of the heat pipe? for the evaporating end, the other end for the condensing end, when one end of the heat pipe is heated, the liquid in the capillary tube evaporates rapidly, and the vapor flows to the other end under the tiny pressure difference, and releases heat, and re-condenses into a liquid, and the liquid then flows along the ? Porous material by capillary force flow back to the evaporation section, so the cycle is more than one, heat from one end of the heat pipe to the other end. This cycle is carried out quickly, heat can be continuously conducted away.
Most of the heat pipes in PC heat sinks use copper as the main material, but because of the different structure of the heat dissipation performance is also very different. Currently in the four classifications (screen, groove, powder sintered) most of the groove and sintered two structures.