Using Excel formulas and thermodynamic property tables, calculate the ejector performance parameters:
: Uses logarithmic correlations involving and with a separate set of constants. Geometric Dimensioning : Nozzle Throat Area ( A1cap A sub 1
A professional-grade should be divided into functional, color-coded tabs to maintain readability and data integrity. Tab 1: Input Parameters & Fluid Properties Motive Stream Data: Mass flow rate (
The "ejector design calculation xls" is a practical, accessible tool that bridges the gap between complex engineering theory and real-world application. Whether you are downloading a community spreadsheet or building your own, the goal is the same: to quickly, reliably, and transparently size and analyze these versatile devices. An understanding of the underlying 1D models, efficiency parameters, and performance curves is essential, not just to run the spreadsheet, but to interpret its results.
Expands high-pressure steam to supersonic velocity, creating a low-pressure zone.
The model assumes both motive and suction gases behave as ideal gases, which is a reasonable approximation at the low pressures typical in the suction and mixing chambers.
The distance between the nozzle exit and the mixing chamber inlet, with an optimal ratio between 0.25 to 1.5 3. Implementation in Excel (XLS) An effective spreadsheet should follow this logical flow: Ejector Motive Steam Consumption - Constant Contact
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Ejectors (also known as jet pumps, eductors, or siphon pumps) are simple yet highly efficient devices that use the Venturi effect to transport fluids, gases, or slurries. Unlike mechanical pumps, ejectors have no moving parts, making them ideal for harsh environments, high-temperature applications, and explosive atmospheres. However, designing an ejector is a delicate balance of fluid dynamics, thermodynamics, and empirical correction factors.
What you plan to use (e.g., steam, air, or hydrocarbon vapor).
If you have a specific application in mind, I can help you explore which design method might be the most appropriate fit.
Therefore, the throat diameter is: [ D_t = \sqrt\frac4 \times A_t\pi \approx 0.00433 \text m = 4.33 \text mm ]
When motive steam expands sharply, it can cross into the wet steam region inside the nozzle. Ensure your spreadsheet checks the quality ( ) of the steam at the nozzle exit.
An spreadsheet is an essential engineering tool used to size, design, and simulate steam or gas jet ejectors by solving fundamental mass, momentum, and energy balance equations . Jet ejectors are critical, static pieces of equipment widely applied in the chemical processing, petroleum refining, and power generation industries to create vacuum conditions without moving parts. 1. Core Operating Principles
The motive fluid entrains the suction fluid. The momentum balance determines the mixing pressure. C. Diffuser Section (Compression)