Research activities in the area of pulsating heat pipes have steadily increased after their introduction in the early nineties of the last century. These apparently simple looking cooling devices have offered considerable challenges in phenomenological and theoretical understanding. Complete design rules and optimization are yet to follow. This paper highlights major progress and milestones achieved in this direction. A comprehensive review of design rules available so far and thermal performance influence parameters are presented. With the progress achieved so far, the prospects for pulsating heat pipes seem very promising.
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