3 replies to this topic

[bysji]

Hi, I'm trying to make a simulation of mixing a gas and liquid flows in MakLad injector(http://www.maklad-fluid.com). Injector consists of two parts: ejector where the first fluid can be added, and like De Laval Nozzle where the second fluid can be added. The carried out tests were done with steam as main stream and water as the additional stream. Due to implosion of steam bubbles during condensation the mix has supersonic velocity in chamber after ejector part before entering De Laval Nozzle. That creates condensation shock inside of the De Laval Nozzle and also is the reason for pressure rise at outlet of injector.

I'm using UniSim and unfortunatly it doesn't have any suggestions for injector. So I apply pipe segments in order to create converging/diverging nozzles. I haven't finished my model yet, but I think I might get a problem trying to get a stable shock inside of the injector.

I'm opened for suggestions and if any of you have ever created injectors in hysys I would like to read/see you solutions.

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[Steve McGahey]

Hi, I'm trying to make a simulation of mixing a gas and liquid flows in MakLad injector(http://www.maklad-fluid.com). Injector consists of two parts: ejector where the first fluid can be added, and like De Laval Nozzle where the second fluid can be added. The carried out tests were done with steam as main stream and water as the additional stream. Due to implosion of steam bubbles during condensation the mix has supersonic velocity in chamber after ejector part before entering De Laval Nozzle. That creates condensation shock inside of the De Laval Nozzle and also is the reason for pressure rise at outlet of injector.

I'm using UniSim and unfortunatly it doesn't have any suggestions for injector. So I apply pipe segments in order to create converging/diverging nozzles. I haven't finished my model yet, but I think I might get a problem trying to get a stable shock inside of the injector.

I'm opened for suggestions and if any of you have ever created injectors in hysys I would like to read/see you solutions.

The fellows at my work put together a dynamic eductor model (in HYSYS = UniSim), which looks quite similar to your diagram, with one exception. They had a motive High Pressure gas (where you show "steam") which was being used to entrain a low pressure gas (where you show "secondary fluid") - there is no primary fluid in what they've constructed. Can you explain how the primary fluid interacts with the rest of your injector model?

- Steve

[miraclework]

Hi Steve,

Looking at this post..

i would highly appreciate if u can send me said HYSYS simulation file ( Ejector ), we have some experiments to carry out. perhaps your file will be useful.


Thanks in advance for your help.

Mira

Hi, I'm trying to make a simulation of mixing a gas and liquid flows in MakLad injector(http://www.maklad-fluid.com). Injector consists of two parts: ejector where the first fluid can be added, and like De Laval Nozzle where the second fluid can be added. The carried out tests were done with steam as main stream and water as the additional stream. Due to implosion of steam bubbles during condensation the mix has supersonic velocity in chamber after ejector part before entering De Laval Nozzle. That creates condensation shock inside of the De Laval Nozzle and also is the reason for pressure rise at outlet of injector.

I'm using UniSim and unfortunatly it doesn't have any suggestions for injector. So I apply pipe segments in order to create converging/diverging nozzles. I haven't finished my model yet, but I think I might get a problem trying to get a stable shock inside of the injector.

I'm opened for suggestions and if any of you have ever created injectors in hysys I would like to read/see you solutions.

The fellows at my work put together a dynamic eductor model (in HYSYS = UniSim), which looks quite similar to your diagram, with one exception. They had a motive High Pressure gas (where you show "steam") which was being used to entrain a low pressure gas (where you show "secondary fluid") - there is no primary fluid in what they've constructed. Can you explain how the primary fluid interacts with the rest of your injector model?

- Steve

[Steve McGahey]

Sorry - we're working in a consultancy, and while I'm happy to offer my opinions on things, I can't give you this model, because it is confidential.

Hi Steve,

Looking at this post..

i would highly appreciate if u can send me said HYSYS simulation file ( Ejector ), we have some experiments to carry out. perhaps your file will be useful.


Thanks in advance for your help.

Mira