There are a number of ways to do this task. Pumped liquid, moving gases, and transported solids. These techniques involve using motive power. Convection, radiation and conduction are methods that use no motive power. However, these methods require considerable temperature differences to operate at high heat fluxes.
Heat pipes are a special form of heat movement using phase change convection.
Whereas normal convection doesn't employ phase changes as heat pipes do. Heat pipes can be made in many forms and for many uses. I will describe two basic types. The first type, a single tube type, is described well in these 2 web sites. The pipe is well evacuated of air before the fluid is added.