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Old   January 14, 2015, 13:34
Default Diameter of particle dpm
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Hi everybody,

i have problem with transient injection in a dpm simulation. i should want an injection of particle with the diameter of nozzle-hole, then with "point injection" the particle diameter should be the same of diameter point, that i set 0.00014 m.

I can't undertand why there are particle with diameter that is 0.00025m!

Can you help me?

thank you!!
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Old   January 20, 2015, 06:33
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Quote:
Originally Posted by DrFloyd View Post
Hi everybody,

i have problem with transient injection in a dpm simulation. i should want an injection of particle with the diameter of nozzle-hole, then with "point injection" the particle diameter should be the same of diameter point, that i set 0.00014 m.

I can't undertand why there are particle with diameter that is 0.00025m!

Can you help me?

thank you!!
Dear DrFloyd,

Where did you set the diameter and how did you get the particle diameter in fluent?
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Old   February 12, 2015, 12:55
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Dr fishball,
I apologize for the late reply but i was abroad.
In the discrete phase model i create an injection and i choose respectly:
injection type -> solid cone
diameter distribution -> uniform
point properties -> diameter = 1.4e-04.

Can you help me with these large bubbles that i find in the spray with a diameter bigger than the fixed size?
thank you!
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Old   February 12, 2015, 21:31
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Originally Posted by DrFloyd View Post
Dr fishball,
I apologize for the late reply but i was abroad.
In the discrete phase model i create an injection and i choose respectly:
injection type -> solid cone
diameter distribution -> uniform
point properties -> diameter = 1.4e-04.

Can you help me with these large bubbles that i find in the spray with a diameter bigger than the fixed size?
thank you!
Where you find the bigger diameter size from?
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Old   February 13, 2015, 10:33
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Hi fishball,
during the injection at some time the nozzle injects these large bubbles. I find them in a random position respect to spray axes at the end of the injection time. They are about 15-20!
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Old   February 16, 2015, 22:08
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Originally Posted by DrFloyd View Post
Hi fishball,
during the injection at some time the nozzle injects these large bubbles. I find them in a random position respect to spray axes at the end of the injection time. They are about 15-20!
Which injection type you set for the injection. For some atomizer types, only injector inner diameter could be configured not particle's diameter
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Old   February 17, 2015, 04:05
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Originally Posted by fishball View Post
Which injection type you set for the injection. For some atomizer types, only injector inner diameter could be configured not particle's diameter
the injection type is "solid-cone"..I mean the initial diameter setted in "initial diameter distribution". This is the diameter of the first particles injected before the breakup and their size should be constant.
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Old   February 17, 2015, 15:22
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is collision and coalescence turned off?
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Old   February 17, 2015, 16:45
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is collision and coalescence turned off?
yes collision and coalescence are turned off
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