A heat removal assembly for use with a power converter that includes a condenser and an evaporator coupled in flow communication with the condenser. The evaporator is configured to channel working fluid therebetween. The evaporator includes a supply housing, a receiving housing, and at least one expansion housing extending between the supply housing and the receiving housing. The at least one expansion housing includes a flow inlet defined at the supply housing and a flow outlet defined at said receiving housing, and the flow inlet is sized smaller in cross-sectional size than the flow outlet.