Patent ID: 7486515

Claim:
A fluid circulator for moving a fluid to transfer thermal energy away from electrical circuitry to cool the electrical circuitry, said fluid circulator comprising: a housing comprising walls defining a fluid vessel for receiving fluid and electrical circuitry in heat transfer relationship with the fluid the housing comprising a thermally conductive heat sink, and a circuit board comprising the electrical circuitry, wherein the circuit board forms a wall of the housing to define the fluid vessel; the fluid circulator disposed within the fluid vessel and located in fluid flow communication with the fluid for circulating the fluid to cool the electrical circuitry, wherein the fluid circulator comprises: a first sheet exhibiting a first coefficient of thermal expansion (CTE); a second sheet dissimilar from the first sheet and exhibiting a second CTE that is substantially different tan the first CTE, wherein the second sheet comprises an electrically conductive medium having a resistance such that the second sheet generates thermal energy when electrical current is applied across the second sheet to provide a change in temperature; and a bonding medium connecting together the first and second sheets, wherein the first and second sheets expand and contract at different rates based on changes in temperature such that the first and second sheets change shape to create a fanning motion to circulate the fluid in heat transfer relationship with the electrical circuitry to cool the electrical circuitry.