Condenser structures with fin cavities facilitating vapor condensation cooling of coolant

A cooling apparatus comprising:

• a housing configured to at least partially surround and form a sealed compartment about an electronic device to be cooled;
• a dielectric fluid disposed within the sealed compartment, wherein the electronic device to be cooled is at least partially immersed within the dielectric fluid;
• at least one pump disposed within the sealed compartment for actively pumping the dielectric fluid disposed within the sealed compartment towards the electronic device to be cooled, the at least one pump comprising an impingement-cooling, immersed pump disposed within the sealed compartment, the impingement-cooling, immersed pump actively pumping the dielectric fluid drawn via an inlet from a lower region of the sealed compartment towards the electronic device to be cooled;
• an at least partially submerged baffle disposed adjacent to at least one side of the electronic device to be cooled to facilitate directing of dielectric fluid vapor to an upper region of the sealed compartment, and away from the dielectric fluid in the lower region of the sealed compartment being drawn into the impingement-cooling, immersed pump for active pumping via an outlet towards the electronic device to be cooled, wherein the inlet and the outlet of the impingement-cooling, immersed pump are disposed on different sides of the at least partially submerged baffle;
• and
• a vapor condenser extending into the sealed compartment in the upper region of the sealed compartment, the vapor condenser comprising:
• a thermally conductive base structure;
• and
• at least one thermally conductive condenser fin extending from the thermally conductive base structure, wherein the at least one thermally conductive condenser fin has a proximal end coupled to the thermally conductive base structure and a remote end remote from the thermally conductive base structure, and wherein the at least one thermally conductive condenser fin comprises at least one exposed cavity therein extending from the remote end thereof towards the proximal end, the at least one exposed cavity being sized to provide a greater condenser fin surface area for facilitating coolant vapor condensate formation on the at least one thermally conductive condenser fin.