Heat transfer controlling mechanism and fuel cell system having the heat transfer controlling mechanism
A heat transfer controlling mechanism and a fuel cell system, which allow working fluid to flow in a predetermined direction in a loop-shaped flow path without a back flow, having a simple structure independent of the orientation during use, low power consumption, and efficient heat transfer and size reduction. The mechanism includes a vaporizing portion, a condensing portion, and a loop-shaped flow path connecting the vaporizing and the condensing portions so as to seal working fluid. The mechanism transports heat by vaporizing the fluid in the vaporizing portion and condensing the fluid in the condensing portion to control heat transfer. The mechanism further includes a gas passage suppressing portion on one side in the flow path, for allowing liquid, but not gas, to pass therethrough and a liquid passage suppressing portion on the other side in the flow path, for allowing gas, but not liquid, to pass therethrough.
1. A heat transfer controlling mechanism comprising:
a vaporizing portion;
a condensing portion;
a loop-shaped flow path connecting the vaporizing portion and the condensing portion such that a working fluid is sealed therein;
a gas passage suppressing portion provided on one side in the loop-shaped flow path, for allowing a liquid to pass therethrough and suppressing passage of a gas; and
a liquid passage suppressing portion provided on another side in the loop-shaped flow path, for allowing a gas to pass therethrough and suppressing passage of a liquid,
wherein the heat transfer controlling mechanism performs a heat transport by an action of vaporization of the working fluid in the vaporizing portion and by an action of condensation of the working fluid in the condensing portion to thereby control transfer of heat, and
wherein at least one of the gas passage suppressing portion and the liquid passage suppressing portion comprises a wettability changing portion comprising a material whose contact angle is changed at a predetermined temperature.
2. The heat transfer controlling mechanism according to claim 1 , wherein the wettability changing portion comprises a material whose property changes from hydrophilicity to hydrophobicity at a predetermined temperature or more.