Patent ID: 7537047

Claim:
A liquid-cooling heat sink comprising: a base; a heat exchanger having a hollow formed therein, the heat exchanger being thermally coupled to a top surface of the base; a housing having a chamber formed therein, the housing being placed over the base with the heat exchanger enclosed within the chamber, the chamber being separated by the heat exchanger into a first sub-chamber encircled by the heat exchanger and a second sub-chamber encircling the heat exchanger, the first sub-chamber being in fluid communication with the second sub-chamber through a plurality of microchannels formed within the heat exchanger; an inlet fluidly connected to the first sub-chamber so as to impinge liquid coolant onto the top surface of the base; and an outlet fluidly connected to the second sub-chamber so as to drain liquid coolant from the second sub-chamber; wherein the heat exchanger includes a plurality of annular plates coaxially stacked one on another, each annular plate having a plurality of first perforate sectors and a plurality of second perforate sectors arranged alternately.