jet pum

marthial · July 25, 2010, 00:54

hi everyone
does someone have any idea how to modeling high velocity flow in ejector( as the one use in refrigeration cycle) but in my present case the fluid is water-vapor ,the primary flow has velocity in order of 200m/s at 100C of temperature and the secondary flow has a pressure in order 6000Pa and temperature of 45C
the represent view of the ejector is given with this linkhttp://ijlct.oxfordjournals.org/cgi/...4/1/2/CTN001F2
i already try what i can but i don' have any good result, if someone have any tutorial or any ideas which can help me i will be glad
thank to take your time to read me

tomek · July 31, 2010, 06:45

I simulated very similar model. It was lowpressure ejector of domestic burners. I have two streams of gas: natural gas and air (primary air). I used model: species transport. Thanks for this model i get density which value was consequence of mixing of this two streams. So this model was kind of ejector because velocity of gas (about 80 m/s) make that the air was suck in to burners. Sorry for my english. It is polish-english

marthial · July 31, 2010, 07:38

thank Tomek to take your time replying me ,my English is not good too so

in your work you used two different fluid that it?how low was pressure you used? because i realized that the high pressure i use maybe the real problem..

tomek · July 31, 2010, 11:47

I used one phase (gas phase). One gas it was natural gas, second gas was air - I simulated how domestic burner work. The pressure of natural gas was 2000 Pa (pressure above atmospheric), the pressure of air was O Pa (my boundary conditions). If you choose model 2D try to use model 3D. When I use model 2D the result was far-away from correct answer.

tomek · July 31, 2010, 11:53

I think the level of pressure is not problem. It's depend on size your diameter. I used the nozzle with diameter 1,07 [mm], the gauge pressure 2000 Pa caused max speed flow about 80 m/s in the nozzle.

marthial · August 3, 2010, 10:09

thank u for your indications and sorry to reply little late i have been busy with others stuff
i will then first try to use a 3D model and see if i get better result, i work with a diameter of 2.4mm , i will let u know what i get, thank you again for your time

July 25, 2010, 00:54	jet pum	#1
marthial New Member aime marthial Join Date: Mar 2010 Posts: 14 Rep Power: 16	hi everyone does someone have any idea how to modeling high velocity flow in ejector( as the one use in refrigeration cycle) but in my present case the fluid is water-vapor ,the primary flow has velocity in order of 200m/s at 100C of temperature and the secondary flow has a pressure in order 6000Pa and temperature of 45C the represent view of the ejector is given with this linkhttp://ijlct.oxfordjournals.org/cgi/...4/1/2/CTN001F2 i already try what i can but i don' have any good result, if someone have any tutorial or any ideas which can help me i will be glad thank to take your time to read me

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July 31, 2010, 06:45		#2
tomek New Member Tomek Join Date: Jul 2010 Posts: 5 Rep Power: 15	I simulated very similar model. It was lowpressure ejector of domestic burners. I have two streams of gas: natural gas and air (primary air). I used model: species transport. Thanks for this model i get density which value was consequence of mixing of this two streams. So this model was kind of ejector because velocity of gas (about 80 m/s) make that the air was suck in to burners. Sorry for my english. It is polish-english

July 31, 2010, 07:38		#3
marthial New Member aime marthial Join Date: Mar 2010 Posts: 14 Rep Power: 16	thank Tomek to take your time replying me ,my English is not good too so in your work you used two different fluid that it?how low was pressure you used? because i realized that the high pressure i use maybe the real problem..

July 31, 2010, 11:47		#4
tomek New Member Tomek Join Date: Jul 2010 Posts: 5 Rep Power: 15	I used one phase (gas phase). One gas it was natural gas, second gas was air - I simulated how domestic burner work. The pressure of natural gas was 2000 Pa (pressure above atmospheric), the pressure of air was O Pa (my boundary conditions). If you choose model 2D try to use model 3D. When I use model 2D the result was far-away from correct answer.

July 31, 2010, 11:53		#5
tomek New Member Tomek Join Date: Jul 2010 Posts: 5 Rep Power: 15	I think the level of pressure is not problem. It's depend on size your diameter. I used the nozzle with diameter 1,07 [mm], the gauge pressure 2000 Pa caused max speed flow about 80 m/s in the nozzle.

August 3, 2010, 10:09		#6
marthial New Member aime marthial Join Date: Mar 2010 Posts: 14 Rep Power: 16	thank u for your indications and sorry to reply little late i have been busy with others stuff i will then first try to use a 3D model and see if i get better result, i work with a diameter of 2.4mm , i will let u know what i get, thank you again for your time