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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.
The steam nozzle discharges a high-velocity jet across the suction. chamber. This steam jet creates a vacuum which extracts air or gas. from the adjoining vessel. As these gases are entrained in the. steam, the mixture travels through the ejector into a venturi-. shaped diffuser. In the diffuser, its velocity energy is converted. into pressure energy, which helps to discharge the mixture against. a predetermined back pressure, either to atmosphere or to a con-. denser (Figure 1).