Abstract
In this study, an air based ejector (ABE) was designed and manufactured, and the experiments were conducted for air as the working fluid with several motive pressures at two different nozzle exit positions. Furthermore, a simulation was carried out through the Realizable k-ε turbulence model to predict effect of the inlet primary pressure, and the nozzle exit position on the first and second laws of Thermodynamics within the ABE. The hydrodynamic behavior of the flow field as well as the exergy dissipation values within the ABE at different inlet primary pressures, and positions of nozzle were assessed. Moreover, the results revealed that the strain rate value and the situation of the vortex inside the ABE determine the alteration of energy type, i.e. the kinetic energy enhances and a vacuum is created. Ultimately, the highest first and second law efficiencies of the ABE were 37% and 82%; respectively, at nozzle exit position equal to −10 mm.
Highlights
IntroductionEjectors possess the long lifespan and simple geometry (no moving parts), which transfer the energy from a primary fluid to a secondary fluid
Ejectors possess the long lifespan and simple geometry, which transfer the energy from a primary fluid to a secondary fluid
Gas and vapor single phase ejectors have been noticed as a hopeful alternative to many formal and heat-driven systems, such as absorption and compression systems based on the refrigeration cycles [4,5]
Summary
Ejectors possess the long lifespan and simple geometry (no moving parts), which transfer the energy from a primary fluid to a secondary fluid. They do not require a mechanical shaft as the energy input. They need little maintenance and have low installation and operation costs. These facilities greatly reduce equipment mass and increases reliability in industrial cycles [1]. There have been many findings in solar energy industry [6,7,8,9], among which it is a reassuring approach to exploit ejectors within solar systems [10,11,12]
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