Fundamental Studies of Jumping-Drop Thermal Diodes
Technical Report,20 Feb 2015,20 Feb 2016
Duke University, Office of Research Support Durham United States
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In this exploratory project, the performance of the planar jumping-drop thermal diode was studied after freeze-thaw cycles. The thermal diode consisted of two parallel plates, one superhydrophobic and one superhydrophilic, separated by a thermally insulating gasket which also provided a vacuum seal. In the forward mode when the superhydrophobic plate was colder,the self-propelled jumping of condensate drops on the superhydrophobic surface returned the working fluid to the opposing superhydrophilic surface. Both the galvanic superhydrophobic surface and sintered superhydrophilic surface were verified to survive a freeze-thaw cycle. However, the flat gasket for vacuum seal introduced leakage of noncondensable gases after a freeze-thaw cycle. With a modified gasket design, the jumping-drop thermal diode should be suitable for freeze-thaw conditions.