Tunable thermal transfer within an oscillating heat pipe

A tunable oscillating heat pipe system comprising:

• a heat source;
• a heat sink configured to absorb heat;
• a passive oscillating closed loop heat pipe with a first portion of the heat pipe arranged adjacent the heat source and a second portion of the heat pipe arranged adjacent the heat sink, wherein the heat pipe configured for movement of a fluid in an internal passage in the closed loop to transfer heat from a first portion of the closed loop to a second portion;
• and
• a valve arranged in a section of the internal passage, wherein the valve is movable between an open position and a closed position, wherein in the open position the valve is arranged to permit movement of the fluid in the internal passage, wherein in the closed position the valve is arranged in the internal passage to limit movement of the fluid in a part of the internal passage, wherein movement of the valve between the open position and the closed position is a function of at least one of temperature at the first portion, temperature at the second portion, or temperature at the valve.