Patent ID: 8341948

Claim:
An exhaust gas cooling apparatus, comprising: a first fluid conduit; a variable nozzle extending from the first fluid conduit, the variable nozzle further comprising at least two dissimilar materials adjacent to each other; and a second fluid conduit having an inlet end and an outlet end, at least a portion of the variable nozzle being disposed in the second fluid conduit proximate to the inlet end of the second fluid conduit such that a fluid inlet opening is located between an outer periphery of the variable nozzle and an inner surface of the inlet end of the second fluid conduit, the at least two dissimilar materials vary the size of an opening of the variable nozzle by moving toward or away from a center line of the first fluid conduit in response to a temperature of an exhaust gas flowing through the first fluid conduit to mix the exhaust gas with a fluid surrounding a portion of the first fluid conduit proximate to the fluid inlet opening by drawing the fluid into the second fluid conduit, wherein the size of the opening of the variable nozzle decreases in response to the temperature of the exhaust gas increasing above a predetermined temperature.