thereof thus forming a circulative cooling apparatus application_number US 62145203 A description reference will now be made in detail to the present preferred embodiments of the invention examples of which are illustrated in the accompanying drawings wherever possible the same reference numbers are used in the drawings and the description to refer to the same or like parts the present invention provides a circulative cooling apparatus to improve the dry out problem of conventional heat pipes and vapor chambers the invention provides a circulative cooling apparatus including two chambers and two pipes an evaporation chamber receives heat energy from a heat source and a porous structure thereof contains saturated work fluid the work fluid is evaporated to vapor by heat energy and owing to the pressure drop the vapor of the work fluid moves to a condensation chamber through a vapor pipe then the vapor of the work fluid condenses into the work fluid because of the lower temperature of the condensation chamber the condensation chamber is storage for the work fluid and the work fluid is transported back to the evaporation chamber through a fluid pipe thus forming a circulative cooling apparatus the condensation chamber contains a lot of work fluid and the porous structure inside the evaporation chamber contains saturated work fluid when the work fluid inside the evaporation chamber is evaporated to vapor by heat energy and then moves.