Models lm and ell are liquid operated jet pumps for exhausting. Fox liquid eductors are venturi jet pumps that use liquid to create vacuum to mix, blend, or dilute other liquids, dry solids, or gasses into a liquid stream. Pdf in this paper, the steam jet ejector was designed and then the. Tll series liqui jet eductors are relatively inexpensive liquid powered devices that will pump smaller volumes of gasvapor, and create significant 28 inhg vacuum. When highpressure liquid enters the intake, it creates suction that draws a second liquid into the pump body and discharges a pressurized blend of the two. Swelling of the flow control insert in certain liquids will result in loss of flow rate accuracy. I have fabricated the eductor and it is a big success.
If you recognize any of the following, you can probably use a penberthy jet pump. Jet mixer a jet mixer, sometimes also referred to as a mixing eductor is used to agitate liquids, mix two or more liquids, homogenize tank contents and dissolve fine solids in liquid in open as well as closed tanks. Waterjet pump design raschet vodostruynogo ezhektora, dtic. Liquids with other physical properties require a special ejector design as, amongst other things, boiling behaviour, viscosity and the specific weight of the respective liquid have to be taken into consideration for the ejectors design. Typically, a steam jet heater includes an inlet for the liquid to be heated, a steam inlet suction where steam is introduced under pressure, and a discharge where the heated liquid and condensed steam leave. Not only can internal geometry be changed to suit design conditions, but additional features can be added such as two to four suction ports, mounting holes, special end connections, electropolishing, ulapproval, passivation, oxygen cleaning, etc. Eductors work in just about any place where there is a need for a more efficient way to pump liquids and solids. Liquid jet eductors use the kinetic energy of a motive liquid to entrain another liquid, completely mix the two, and then discharge the mixture against a counter pressure and are used in large numbers throughout industry for pumping and mixing operations. Scfm q gas acfm x 530 r x pressure gas psiatemp o gas r x 14. Penberthy series ll, lm, lh, gl and gh jet pumps for pumping liquids product overview there are two basic series of penberthy jet pumps available for pumping liquids. An eductor is required to pump 20 gpm of water from a tank 15 feet below and discharge the water 10 feet vertically equivalent to a back pressure of 4. The overall compression ratio required is approximately 55. Steam ejector calculations free downloadexcel spreadsheet.
Although design and construction may vary, this applies to all jet pumps. In operation, pressure liquid enters the eductor through the pressure nozzle and produces a highvelocity jet. If the liquid temperature exceeds 100f, you must use the npsh calculation, or consult your representative or the factory. Specialty ejectors which use steam as a motive jet heaters are used to heat fluid in pipelines and tanks. The fluid in the nozzle jet and the entrained liquid are forced through a diffuser where the high throughput velocity creates a turbulent flow.
Jet pump application guide water jet eductors are products. While jet eductors may differ in appearance, basic operation is the same. The eductor pump, even one designed for liquid liquid. When the two streams mix, momentum from the liquid motive is transferred to the liquid suction stream, after which the combined streams enter the venturi tail and the resultant velocity is converted into pressure at the jet. It may utilize a spray nozzle or multiple nozzles to improve contact with the suction gas. Water jet eductors are products made for liquid pumping. As a result, operating the first ejector at the maximum limit gives an outlet pressure of 36. An ejector pump in which the entrainment fluid is a liquid usually water. The liquid jet eductor design consists of a removable motive nozzle and body with a venturi tail. Eductor operating principles basic theory an eductor uses a nozzle to produce a high velocity fluid jet to entrain the liquid surrounding the eductor fluid can be either a gas or a liquid. Use our cnc computer numerically controlled lathes to make production quantities in batches of 50 to pieces.
Inlet the operating medium liquid, gas, or steam under pressure enters the inlet and. Jet pumps, also known as eductors, operate on the principles of. When pressurized water enters the injector inlet, it is constricted toward the injection chamber and changes into a highvelocity jet stream. The highvelocity jet of liquid from the eductor nozzle creates a vacuum, which causes the suction of. The applica tion determines the design of the flow section. If only one load and vacuum are required for a particular application, single and multistage ejectors can be designed specifically for one condition. A jet pump also referred to as an eductor is a kind of jet type pump that do not require any moving parts to be able to pump out a liquid or gas from a certain area. Liquid jet mixers are jet pumps to mix and circulate liquids.
This article proposes a fairly simple and reliable. All jrgjt tables use the 112 inch unit as the standard, and eductors are sized using a sizing factor s. Steam jet ejector cooling powered by low grade waste or solar heat. Eductors consist of a converging nozzle, a body and a diffuser and resemble syphons in appearance. A steam jet ejector is illustrated below as ex ample steam serves as motive fluid to create vacuum. Additionally, this model has been applied to twophase systems including the gas liquid ejector designed for a proton exchange membrane pem fuel cell system. Design features and operation of jet ejectors korting hannover. Liquid jet mixers for food applicationsorbitally welded design. First, equal steam flow rate is assumed to each stage. Jet aerators use the ejector method of contacting gases and liquids.
Liquid jet eductors the pumps with no moving parts. The high pressure motive liquid enters the motive chamber of the eductor through a converging motive nozzle. An operating fluid media, which is referred to as the motive, placed under pressure enters the inlet and is forced through the nozzle where it is converted into a highvelocity stream. A numerical analysis of novel liquidgas jet ejector citeseerx. This module contains a model for a jet pump, also known as an eductor or an. Numerical investigation of a liquidgas ejector in marine ships. This jet action creates a vacuum in the line which causes. The new line of jacoby tarbox eductors offers advanced design features and superior technical capabilities to create the eductor for virtually any application. Ejector design is based on the theory of nozzle and diffuser areas and on a combination of theory and empirically determined coefficient for lengths and shape. A jet ejector requires no mechanical drive and has no moving parts.
The term jet ejector describes a device in which a pumping effect is achieved using a motive fluid. As a first estimate, a five stage ejector is assumed. Water jet eductors are products made for liquid pumping and. Relative suction flow of steam jet vacuum ejectors the result of calculation will be identical with the. Current advances in ejector modeling, experimentation and.
All jet pumps operate on the principle of a fluid entraining a second fluid. Metal liquid powered jet pumps powered by liquid, use these to pump a second liquid or to produce emulsions, elevate water, and transport grains and other small particles. Eductor is available in various material of construction such as castiron, steel, stainless steel, monel, inconel, hastalloy, titanium, pvc, pvcfrp, polypropylene, kynar, teflon. The jet consists of a double nozzle arrangement that has a primary inner nozzle, an inter mediate high shear mixing chamber and an outer sec ondary nozzle. Water jet ejectors are coimnonly used aboard ships as drainage systems. The suction point is where the jet enters the mixing region, indicated on the drawing at the 3 to 6 point. Liquid operated eductors are employed as mixers, circulators, syphons and scrubbers. If there is a convergent nozzle not shown in the drawing the jet, the suction point, and the mixing region should be upstream of the convergent section.
The strength of the vacuum produced depends on the velocity and shape of the fluid jet and the shape of the constriction and mixing sections, but if a liquid is used as the working fluid the strength of the vacuum produced is limited by the vapor pressure of the liquid for water, 3. P100 liquid jet eductor sizing eductor sizing simple example sizing an eductor for a water flow. Ezejector now offers a program for design of multi stage steam ejectors. The l series has three models, the ll, lm and lh which use liquid as the operating medium. Eductors can entrain up to five times the amount of pumped solution depending on the eductor. Liquid jet eductors the pumps with no moving parts schutte. Jet pumps, also known as eductors, operate on the principles of fluid dynamics. Sodimate solution are an ideal way to continuously produce solutions or well blended slurries and are commonly used in chemical, food, power, pharmaceutical, and waste water applications. Because moving fluid is essential to the operation of an eductor, the device may be defined as a jet pump that uses pressurized liquid, supplied by another pumping source, as motive fluid to modify and alter the pumping systems fluidhandling characteristics, fig. Croll reynolds specialty ejectors are an economical means of mixing, heating and circulating a wide variety of liquids. Fox valve manufactures a broad range of engineered products based on one core technology. The structure of the pump is such that it has an injector. Liquid jet eductors venturi jet pumps manufacturers of.
How do i design an eductorjet or venturi system to. Liquid jet eductors for pumping, lifting, adgitating, mixing. They are used to replace or eliminate pumps when simple, ultrareliable liquid mixing is required. Sodimate liquid eductors jet pumps use water or other liquids under pressure as the motive fluid, and operate on the venturi principle to mix dry chemicals into slurries water is constantly injected inside the slurry cone to provide instantaneous hydration, reduce dust, and avoid clumps. This additional liquid flow mixes with the pumped solution and multiplies its volume.
On the other hand, jet pumps with gas or steam motives use convergingdiverging. The working process in a liquid jet pump or in a gas ejector is the same. As a rule, jet mixers can be used in all cases where the liquid to be mixed can still be supplied by a centrifugal pump. These pumps make use of their structure to transfer energy from one fluid to another via the venturi effect. A theoretical comparison of twostage and crmc based jet pump cycles was performed. Liquid amp water jet eductors venturi jet pumps limited.
Liquid ring vacuum pump a rotary positive displacement pump in which an eccentric rotor with fixed blades throws a liquid against the stator wall. The jet venturi fume scrubber is also an example of this type of eductor. Nomenclature pressure of the primary fluid steam pressure of. This basic principle applies to every jet ejector in different models and ranges of application. The range of applications for liquid jet mixers is only limited by the viscosity of the liq uid to be mixed. Pdf empirical correlation for ejector design researchgate. For reporting bugs, adding feature requests, or submitting pull requests, please use the github issue tracker or contact the author at caleb. Water jet eductors are designed for liquid pumping and mixing operations and for the handling of some solids. How to size liquid motive eductors for pumping liquids. The fume scrubber is a water jet air pump, designed for low drafts and large capacity. Design and performance for incompressible liquid flow. Outlet adjustments the outlet pressure of the eductor must be adjusted for the specific gravity of the outlet liquid, particularly if the eductor is discharging to an elevated surface.
Liquid eductor to produce large critical mass flow and droplets. Occasionally, however, singlepoint design ejectors are not always stable at very light loads or at loads slightly in excess of design. Process design of vacuum equipment vacuum pumps and steam jet ejectors project standards and specifications page 5 of 36 rev. Although their designs vary, the operation of each is based on the jet operating principles of the jet pump. Liquid jet vacuum pumps suction and compression of gas mod. The device where the liquid flow and the airflow come into contact with each other to produce a volumetric fine mist spray use for dust suppression in construction sites. Design and operation of steam jet ejectors puts a maximum limit of 5 on the compression ratio, power 1994. To adjust the value from the performance table for specific gravity sg of the motive fluid. Pdf design, cfd analysis and performance evaluation of the. Jet mixer systems gea engineering for a better world. Water jet eductors utilize the kinetic energy of one liquid to cause the flow of another. The two stream of liquid and air collide and exit the spray cap at high velocity spray discharge to effect fine atomisation. The typical evaporator liquid temperatures range from. Principle of operation the liquid jet eductor enables to lift, entrain and pump out a low pressure liquid utilizing a high pressure motive liquid.
Like all penberthy jet pumps, liquid motive jet pumps are simple in design with. The outlet pressure of the eductor must be adjusted for the specific gravity of the outlet liquid, particularly if the eductor is discharging to an elevated surface. Firstrate liquid jet eductors experts venturi systems. The easy way to pump, mix or heat a wide range of liquids and gases. Jet pump technical data heating liquids water jet eductors. A liquid jet eductor is a jet pump that uses a highpressure liquid motive to entrain a lowerpressure liquid suction. The syphon is a stream jet liquid pump which requires condensation of the. All applications should be carefully tested both for flow characteristics and compatibility of the motive liquid and educted chemicals to insure desired results. These range from offtheshelf solidsconveying, liquid, and gas jet eductors to highly qualified flow controls for spacecraft, energy research, and advanced product development projects. To determine the correct eductor for a specific application, follow the steps in this section, using the performance tables provided to achieve your desired results. Additionally, this model has been applied to twophase systems including the gas liquid ejector designed for a. These mixers can be installed and used in neutralization basin also. The device where the liquid flow and the airflow come into contact with each other to produce a volumetric fine mist spray use for dust suppression. Because of this, design differences may exist within the motive connection of the jet pump.
Ejector for hydrogen fuel cell anode recycle the ejector works. Off design operating conditions, such as the shock occurring in the primary stream, are included in the generalized ejector model. They can easily handle particulate laden liquid streams that would destroy the internals of a standard pump. How do i design an eductorjet or venturi system to rapidly. The motive flow is the amount of liquid used to power the eductor. This is perhaps one of the most recognized uses for a jet pump in the process industry. Jet pumps can operate with a wide variety of motive liquids and gases. The following design diagrams are based on the physical properties of water as a motive medium. A small scale steam jet ejector experimental setup was designed and manufactured. As the liquid exits at high velocity, it draws surrounding solution through the eductor s flowthrough chamber. Eductors use a high speed jet to mix with the fluid that needs to be pumped. Ejector design calculation pdf download unger i hedmark l. Liquid jet eductors for pumping, lifting, adgitating.
Fox liquid jet eductors made in usa fox venturi products. Eductors are a kind of jet type pump that do not require any moving parts to be able to pump out a liquid or gas. For instance, jet pumps with liquid motives use a converging nozzle, since liquids usually cannot be compressed. Jun 26, 2018 the eductors are designed for operation with water as the operating medium. Our aquaductor units use high pressure water as a motive to handle another liquid or slurry as the suction.
In operation, the pressure energy of the motive liquid is converted to velocity energy by the converging nozzle. The highvelocity jet of liquid from the eductor nozzle creates a vacuum, which causes the suction of the mixed liquid. Primetech offers complete range of liquid jet eductors to meet various industrial needs and applications. Multiply the motive flow in the performance chart by the square root of 1sg. Liquid jet eductor exhauster bulletin 265485 schutte. An abrupt change in suction capacity occurs when discharge pressure exceeds the design point of approximately 8 psig.
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