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Steam Ejector in Refrigeration Cycle CFD Simulation

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Ejector is a mechanical device that uses a primary (motive) fluid to suck up a secondary fluid (gas, liquid, or solid particles). Eventually, the ejector mix the two primary and secondary fluids and they exit from the outlet. Ejectors have two major tasks, including creating vacuum and gas suction as well as fluid mixing.The basis of the ejector is to create a vacuum for the suction of the desired fluid (such as powder, granule, sludge, etc.), which is based on continuous conversion of kinetic and pressure energy.

This product includes a CFD simulation and training files using ANSYS Fluent software.

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Description

Ejectors

In fact, ejectors performance is like vacuum pumps, but because of the lack of moving mechanical components inside the ejector building, they are more economical. Industries like food industries (to improve fruit concentrate quality), refineries (to separate heavy oils at high temperatures), refrigeration cycles (to increase steam pressure as a compressor replacement) and … apply ejector.

The ejector structure is a convergent-divergent nozzle. By entering the primary fluid through the convergent section of the nozzle – according to the continuum equation – causes the fluid velocity to increase by decreasing the cross-sectional area of the flow, in fact converting the potential energy of the fluid into kinetic energy. Then, due to Bernoulli’s equation, the fluid pressure decreases with increasing velocity and consequently the kinetic energy of the fluid. The resulting pressure drop causes a vacuum inside the ejector, which suck the secondary fluid. The primary fluid and the suctioned secondary fluid are then mixed and compacted in the diffuser section.

Steam Ejector Project Description

The present problem deals with the flow of water vapor as the main fluid (primary) and the secondary fluid (suction) within a convergent-divergent ejector. The purpose of the present simulation is to investigate the behavior of primary and secondary fluid after passing through the internal convergent-divergent nozzle and the ejector diffuser. In the present model, due to the vacuum pressure difference between the two inlet fluids, the suction phenomenon for the secondary fluid has to occur. The Mach number corresponding to the fluid flow inside the ejector increases as well. To analyze this model, we investigate parameters such as Mach number, velocity and pressure based on the motion of the fluid flow along the ejector.

Assumption

  • The simulation is STEADY.
  • The problem solving is based on the density-based approach because in models such as the above-mentioned convergent-divergent nozzle, the fluid is compressible and the flow Mach number is high (more than 3) .
  • We use the axismmetric method and draw half of the geometry of the steam ejector.
  • We don’t consider the effect of Earth’s gravity for the simulation.

 

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

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