Enhancement of two-phase thermosyphon for cooling high heat flux power devices

The purpose of this study is the enhancement of cooling of high heat flux power devices such as a thyristor by a thermosyphon system. The thermosyphon used boiling and condensation of inert dielectric fluorocarbon (FC-72). Boiling occurred from a multiple chimney heat transfer structure. A boiling chamber is connected to the condenser by a double tube, with the inner tube carrying the condensed liquid and the outer annulus carrying vapor. Using the experimental model of a thermosyphon, heat flux capacity was enhanced by increasing the flow tube height Ho, boiling chamber height H/sub h/, and condenser liquid level H/sub l/. High heat flux capacity was achieved with H/sub 0/>8 cm, H/sub h/>10 cm, and H/sub l/>H/sub 0/, using chimney heat transfer structure with a channel width of 3 mm. The thermosyphon system was able to cool a maximum heat flux of 3 kW per device.<
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