A Brief Overview Of An Ejector
Posted in Uncategorised, on September 29, 2022 By Admin
There is myriad engineering equipment used in many industries. From liquid ring pumps for providing vacuum, claw pumps for offering suction without any lubrication, and blowers for increasing air volume to heat exchangers for temperature regulation, their applications are numerous. Apart from these tools, ejectors are also utilized in many industries such as pharmaceuticals, chemical processing, refinery, and more. How exactly does the ejector function and why it is so important in these industries?
What is an ejector?
Simply put, an ejector is a device that works on Bernoulli’s Principle, which states that when the velocity of a fluid increases, its pressure decreases, and vice versa. It is denoted by the following equation:
P+(1/2)ρV2+ρgh=Constant
Where P = Pressure, (ρV2)/2 = Kinetic energy spread across the unit volume of the fluid’s surface, ρgh = Potential energy spread across the unit volume, ρ = Density, and lastly, V = Velocity.
Working Principle Of An Ejector
An ejector has three main orifices or openings, the inlet, the discharge, and the suction. The motive fluid, which is the fluid used to draw in the process fluid in the ejector, first enters the device through the inlet. Then, the motive fluid enters a nozzle wherein volume is significantly reduced. This increases the speed of the motive fluid while reducing its pressure. At the point where the pressure is the lowest, a vacuum is created, which draws the process fluid into the ejector. The process and motive fluid mix together and enter a more expansive section known as the diffuser.
As the fluid now enters a more voluminous area, its speed decreases, and pressure increases once again, reaching stable levels. Lastly, the mixed fluids come out of the discharge at the right pressure.
In this manner, an ejector can increase the pressure of low-pressure process fluids into something more usable.
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