Abstract: An exhaust gas cooling apparatus and method for cooling an exhaust gas is provided. The exhaust cooling apparatus has a first fluid conduit and a variable nozzle extending from the first fluid conduit. The variable nozzle being disposed in an inlet end of a second fluid conduit, wherein the variable nozzle has at least two dissimilar materials adjacent to each other and 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.