Direct flow induction devices based on pressure exchange are highly efficient and very compact because of the effective use of the non-steady flow and the reversible pressure work on the fluid-fluid interfaces. These technical advantages will broaden their practical applications to such areas as air conditioning, water desalinization and gas turbine cycles etc. The current paper will discuss in detail the concept of pressure exchange. The physical mechanism of pressure exchange is explored by studying a one dimensional shock tube and a simple two-dimensional example by use of the computational analysis. A novel three-dimensional pressure exchange ejector invented by Garris will be introduced.

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