The three main components of Jet-Apparatus (Converging Nozzle, Suction Chamber, Diffuser), are rigidly fixed in specific relation to each other, hence there are no moving parts – one of the main advantages of this type of device. Available discharge pressure is typically a function of the diffuser velocity and total mass flowrate. Once entrained, the velocity of the mixture of primary and secondary media (kinetic energy), is converted back into pressure energy (potential), by means of a volumetric divergence (i.e. The suction capacity of a specific device is typically a function of the primary fluid velocity and mass flowrate. Suction Chamber) that is at the pressure of the secondary medium, for the purpose of pumping, mixing, evacuating, etc. Jet Apparatus uses this pressure drop to entrain a secondary medium (fluid or granular solid), within a chamber (i.e. For a constant primary fluid mass flowrate and constricting orifice, this pressure drop is a function of the primary fluid pressure. Converging Nozzle), there exists an associated useful pressure drop. When fluid pressure (potential energy) is converted into fluid velocity (kinetic energy) by means of a constricting orifice (i.e. The main principle governing the operation of typical Jet-Apparatus is Conservation of Momentum. Steam ejectors are favored for this because the motive gas steam can be condensed between some of the stages to minimize load (and motive steam) to the following stage. To create a deeper vacuum, ejectors can be ‘staged’ or installed in series. Therefore we are happy to provide consultancy services if required.‘Jet-Apparatus’ is a term typically used to identify a piece of equipment (Liqui-Jet Eductors, Line-Type Heaters, Exhausters, Gas & Chemical Infusers, Mixing Eductors, and Gas-Jet Ejectors, Exhausters, Siphons, Solids Eductors and Steam Spargers that uses a fluid under pressure (liquid / gas / vapor), to perform work on, and in direct contact with, another medium (liquid / gas / vapor / granular solid), in a defined, predictable way. A single ejector can be designed to create as much as 27 in. Problem or to determine whether an application is feasible. We appreciate that Customers often purchase this software to help with trouble shooting of a specific ejector If anything, slightly conservative values have been used.įeedback and suggestions will be gratefully received. efficiencies, based on normal practice and calibration versus installed ejectors. ![]() Thermodynamic and fluid dynamic equations These are based on standard assumptions for angles and ratioĪnd may not be identical to your actual installed units.Įzejector programs includes the following: Preliminary dimensions can be viewed – see below. The Ezejector results include a graph showing how the entrained gas flow rate will (see below) change depending on the entrained gas pressure, for at fixed discharge pressure.This allows you to estimate the impact of entrained gas flow rate on the suction pressure.The program inclues a feature to evaluate the impact of increased back pressure. Typical values will depend on the motive gas pressure and the entrainment ratio. Note that efficiency is low for an ejector. Where the compression ratio is high, it may be be more efficient to use more than one ejector stage.The overall ejector efficiency is calculated. Convergence percent (normally >99%) is supplied to confirm that the program has run successfully. The motive gas Mach No is provided for information. These are more indicative of the response of a specific ejector to changes in inputs. Therefore ejector curves at fixed ejector geometry are calculated at the design discharge pressure and an increased discharge pressure (see 3.2). ![]() Thus the results in the tables above for different gas flow rates, pressures or temperatures do not represent the performance of a specific ejector. If for example the entrained gas flow rate is changed, the mixing diameter will also change – which will have some impact on the discharge pressure. The program calculates the best nozzle and mixing diameters based for the input values. Mixing section diameter is a function of the preceding and entrained gas flow rate, pressure, temperature & molecular weight. Motive nozzle diameter is a function of motive gas flow rate, pressure, temperature & molecular weight. ![]() The nozzle and mixing section diameter are calculated. The key results and supplementary results are shown below. In the updated revision of the software, flow rate input units should be selected as either kg/hr or Nm3/hr. The inputs required are shown in the table below. Please understand that this program is for your use only and prevent access by any outside party. The USER CODE will be supplied to you separately and must be entered every time you run the program. Transmitted as XXX.jpg to allow electronic transmission. This is a Visual Basic program with Interactive forms.
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