LISA model for biomedical application

jeff_F · July 16, 2009, 08:22

Hi all,

This is my first time to post here, hope I can get some advice from the experts here.

I just started my research on the atomization of spray from a medical device. I would like to use LISA model to simulate the primary atomization. The problem is that I found the breakup length was almost 15 times longer than my experimental result. It's too ridiculous.

In the default interface, I can only change the long/short wave ligament factor and droplet diameter size factor only. They are all not related to the calculation of breakup length.

Is there anyone have experience to simulate a spray with low injection pressure?

ghorrocks · July 16, 2009, 20:28

Hi,

I am no expert on spray modelling so I might be completely wrong here (if somebody knows for sure please correct me!), but here goes:

I think the spray models in CFX are designed for high pressure sprays found in fuel injectors for engines. This means they will be tuned to very different regimes to the low pressure regime you are in, so it does not surprise me that they are miles off. You may be able to tweak it to operate in the low pressure regime but I can't be sure - it will be a research project which will require some work.

Glenn Horrocks

July 16, 2009, 08:22	LISA model for biomedical application	#1
jeff_F New Member ManChiu Join Date: Jul 2009 Posts: 13 Rep Power: 17	Hi all, This is my first time to post here, hope I can get some advice from the experts here. I just started my research on the atomization of spray from a medical device. I would like to use LISA model to simulate the primary atomization. The problem is that I found the breakup length was almost 15 times longer than my experimental result. It's too ridiculous. In the default interface, I can only change the long/short wave ligament factor and droplet diameter size factor only. They are all not related to the calculation of breakup length. Is there anyone have experience to simulate a spray with low injection pressure?

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July 16, 2009, 20:28		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Hi, I am no expert on spray modelling so I might be completely wrong here (if somebody knows for sure please correct me!), but here goes: I think the spray models in CFX are designed for high pressure sprays found in fuel injectors for engines. This means they will be tuned to very different regimes to the low pressure regime you are in, so it does not surprise me that they are miles off. You may be able to tweak it to operate in the low pressure regime but I can't be sure - it will be a research project which will require some work. Glenn Horrocks