Plain Thermal Siphons

These thermal siphons (or thermo-siphons) do not have any special structure/lining on the inner walls of the pipe. Fluid return from the condenser end to evaporator end is only by gravity assisted flow. Consequently, these thermal siphons have severe limitation on their orientation of working; that is – the evaporator end of the thermal siphon has to be below the level of condenser end for the thermal siphon to work (transfer the heat under load).

Since thermosyphons do not have wick structures, they are capable of operating at radial heat fluxes up to 5 W/cm2. Heat pipe heat exchangers often consist of fin stacks attached to the evaporators and condensers of multiple thermosyphons and separated by a divider plate.

Since thermosyphons do not have wick structures, they are capable of operating at radial heat fluxes up to 5 W/cm2. Heat pipe heat exchangers often consist of fin stacks attached to the evaporators and condensers of multiple thermosyphons and separated by a divider plate.