Diameter of particle dpm

DrFloyd · January 14, 2015, 13:34

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!!

fishball · January 20, 2015, 06:33

Quote:

Originally Posted by DrFloyd

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?

DrFloyd · February 12, 2015, 12:55

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!

fishball · February 12, 2015, 21:31

Quote:

Originally Posted by DrFloyd

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?

DrFloyd · February 13, 2015, 10:33

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!

fishball · February 16, 2015, 22:08

Quote:

Originally Posted by DrFloyd

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

DrFloyd · February 17, 2015, 04:05

Quote:

Originally Posted by fishball

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.

edoan · February 17, 2015, 15:22

is collision and coalescence turned off?

DrFloyd · February 17, 2015, 16:45

Quote:

Originally Posted by edoan

is collision and coalescence turned off?

yes collision and coalescence are turned off

January 14, 2015, 13:34	Diameter of particle dpm	#1
DrFloyd New Member Join Date: Oct 2014 Posts: 24 Rep Power: 12	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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February 12, 2015, 12:55		#3
DrFloyd New Member Join Date: Oct 2014 Posts: 24 Rep Power: 12	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!

February 13, 2015, 10:33		#5
DrFloyd New Member Join Date: Oct 2014 Posts: 24 Rep Power: 12	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!

February 17, 2015, 15:22		#8
edoan Member Ethan Doan Join Date: Oct 2012 Location: Canada Posts: 90 Rep Power: 14	is collision and coalescence turned off?