Is there any limit for the length of heat pipes?
Can standard (conventional) heat pipes be bent? if yes, how many?
Is it possible to combine several heat pipes in the adiabatic area and then direct it to the condenser as a single heat pipe?
Is it possible to create an electrical insulation between the evaporator area and the adiabatic area (or condenser) of a heat pipe? How?
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Heat Pipes Limits
When the heat pipe is working, the internal working fluid contained in the heat pipe evaporates. It condenses and circulates inside the heat pipe. However, when the heat pipe transmits more heat to a certain heat value. There will be a phenomenon that prevents the working fluid from being heated from a high-temperature heat source. This prevents the transmission of heat from a high temperature heat source through the heat pipe and causes the evaporating part to rise to the same temperature as the eventual heat source. The heat value that causes the above event is Critical heat transfer value The working limits of heat pipes can be divided into 5 main categories: viscous limit, sonic limit, capillary limit, entrainment limit, and boiling limit
Length of heat pipes
This may depend on the application, for example spacecraft applications usually do not exceed 2-3 (m) in length and may be allowed to increase in length because they operate at zero gravity. When the heat pipe is operated by gravity, it is called a thermosyphon. The length is almost unlimited, it can be several hundred m.
Electrical insulation
If electrical insulation is required, heat pipes must be made of an insulating material such as ceramic or glass heat pipes, since ceramic or glass is highly insulating. This makes it possible to insulate several volts along the heat pipe.
This totally depends on your case and the B.C. of it. Indeed, for each case, there is a limitation for every variable parameter included.
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