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ABSTRACT
Steam ejectors are one of the key components of steam ejector refrigeration/heat pump systems. Steam ejector is required to compress low-pressure stream to a higher pressure. Steam ejectors have no moving part, a simple structure, low cost, reliability, easy installation, high vacuum performance, corrosion resistance, and no consumption of electrical energy. In this study, steam ejector design was modeled using finite volume techniques, and Mach number and pressure in constant cross-section have been compared with analytical data reported in the literature. In this work, numerical calculations were performed with ANSYS Fluent(ANSYS FLUENT Theory Guide, ANSYS, Inc. Release 17.2, 2016, Canonsburg, PA, USA), a computational fluid dynamic code. In the turbulent flow, heat transfer-based analyses were performed using energy equations.
Nomenclature
| d | = | Throat diameter of the primary nozzle |
| D | = | Diameter of constant section |
| l1 | = | Length of convergent mixing section |
| l2 | = | Length of constant section |
| l3 | = | Length of diffusor section |
| T | = | Temperature (K) |
| fj | = | Surface penetration rate in a direction |
| fv | = | Volumetric porosity rate |
| fs | = | Superficial penetration rate |
| R | = | Distribution resistance (N/m3) |
| S | = | Source term (m/s2) |
| i, j | = | (= x, y, z) components in the Cartesian coordinate system |
| u | = | x direction velocity (m/s) |
| v | = | y direction velocity (m/s) |
| w | = | z direction velocity (m/s) |
Abbreviation
| CFD | = | Computational fluid dynamics |
| RNG | = | Re-normalisation group |
| SIMPLE | = | Semi-implicit method |
| Ma | = | Mach number |
Greek letters
| ρ | = | Fluid density (kg/m3) |
| ϕ | = | Distribution heat source (W/m3) |
| ɛ | = | Dissipation rate of turbulent kinetic energy (kg/m s3) |
| μ | = | Dynamic viscosity (Pa s) |
| μt | = | Turbulent viscosity (Pa s) |
| Ɵ1 | = | Convergence and divergence angle of the primary nozzle |
| Ɵ2 | = | Angle of convergent mixing section |