The performance specifications for JRG/JT eductors are based on using water with a specific gravity of 1.0 and a viscosity of 1 Centipoise. The ejector doesn’t need electricity, only sufficient quantity of working substance. The biggest advantage of the ejector is the lack of rotating parts as well as its construction simplicity. Pivotal dimensions are calculated from specified operating parameters of working and suctioned liquid. It is suitable to use the ejector at locations with sufficient working substance for device powering. Parameters and the type of primary and secondary liquid. Selection of the design as well as the material of the body and suction nozzle of the ejector depends on operational and max. It can be made of plastic materials, too. Upon agreement, the injector can be made of special refractory steels and materials based on nickel titanium alloys, or tantalum. Mostly used materials are carbon or stainless steels.
Suction nozzle can be manufactured by machining. The body of the ejector can be cast, machined from a forge, or it is welded from bent centring. Wafer type design has advantage of easy replacement of ejector in case of eventual modification of technological parameters as well as better access for servicing. The weld insertion in the pipe has advantages such as material and mass savings on the flanges as well as minimization of leakage at the flange joints. Ejectors can be produced in wafer as well as so-called welded-in designs. Then admixture of working and suctioned substance with the steady pressure and velocity profile leaves the ejector.
Reduced velocity) as well as increase in liquid pressure was caused. At the inlet of the divergent section (expanding channel) there must be subcritical flow according to Huguenot theorem, so that compression (i.e. In case of subcritical flow, the mixing chamber has a shape of a cylinder and in case of supercritical flow it is tapered to slow down the flow. At the outlet of the suction chamber of the nozzle the admixture of substances has the same pressure but different velocity profile, that is to be conditioned in the mixing chamber. Thanks to that there is a negative pressure formed in the suction chamber and it begins to suck-in the secondary (driven) liquid. Due to expansion in the nozzle the pressure is dropped and the velocity of the primary liquid is increased. The ejector works on the principle that the working substance enters the suction nozzle, that can be either classical tapering or Laval’s one, downstream which there can be supercritical flow. In that case the ejector releases mixture of two liquids. According to type and state of driving and driven liquid, the ejectors are divided to water (water is both primary and secondary medium), gas, steam ones etc. Primary (working) liquid is its source of driving energy.įor this reason, it is referred to as “jet pump”. It is similar to a pipe fitting and it has the same function as a pump.
Ejector is a device whose task is to transport liquids through the pipeline. This should be taken into consideration in most pressure drop and flow calculations within a given system.
#Liquid ejector design calculation how to
How to Size Liquid Motive Eductors for Pumping Liquids. Or do you need an ejector design done for you? We can size and specify ejectors for a wide range of applications.