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Diffuser (thermodynamics) A diffuser is a device for reducing the velocity and increasing the static pressure of a fluid passing through a systemâ. Diffusers are used to slow the fluid's velocity while increasing its static pressure. The fluid's static pressure rise as it passes though a duct is commonly referred to as pressure recovery.
An exhaust system is usually piping used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. 1  The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system design, the exhaust gas may flow through one or more of: 1  Cylinder head and exhaust manifold. 2  A turbocharger to increase engine power. 3  A catalytic converter to reduce air pollution. 4  A muffler (North America) / silencer (UK/India), to reduce noise.