Assuming that a heat source is situated at a higher place and the space for the heat sink fin lower, when a heat pipe is needed as a heat transfer element, the medium in the heat pipe is transferred back to the vaporization end from the condensing end by means of capillary phenomena generated by the capillary structure inside the heat pipe.
At this point the vaporization end is higher than the condensing end which means that the medium has to resist gravity in order to return to the heat source/vaporization end through capillarity. These capillary force structures within the heat pipe are currently grooved, sintered, mesh, etc.
Each structure has its own range of suitability. In the example given so far, the sintered capillary structure is more resistant to gravity when the vaporization end is higher than the condensing end, but not all sintered structures can overcome the effects of gravity. Therefore, it is important to discuss the design with the T-Global team and to adjust the relevant parameters accordingly.