Liquid Jet Ejectors: Pumping, Mixing, and Transporting Fluids with the Power of Bernoulli Principle

Liquid Jet Ejectors, also known as jet pumps or eductors, are devices used to pump, mix, and transport liquids, gases, and solids. They work based on the principle of fluid dynamics, where a high-velocity fluid is used to entrain and transport a lower-velocity fluid. The highvelocity fluid is usually referred to as the motive fluid, while the lower-velocity fluid is known as the suction fluid or the entrained fluid.

Liquid Jet Ejectors are commonly used in various industries, including chemical, pharmaceutical, petrochemical, food and beverage, and wastewater treatment, among others. In this article, we will discuss the working principle of liquid jet ejectors, their applications, advantages, and disadvantages.

Working Principle

Liquid Jet Ejectors operate on the Bernoulli principle, which states that an increase in the velocity of a fluid results in a decrease in its pressure. The motive fluid is supplied at high pressure and velocity through a nozzle, creating a low-pressure zone in the suction chamber. The suction fluid is then drawn into the low-pressure zone and entrained by the high-velocity motive fluid. The combined fluid stream is then passed through a diffuser, where the velocity is reduced, and the pressure is increased.

The ratio of the mass flow rate of the motive fluid to the suction fluid is known as the entrainment ratio, and it determines the efficiency of the jet ejector. The higher the entrainment ratio, the more efficient the ejector.