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Old   March 23, 2003, 17:53
Default injection in a vein
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aditya
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hello everybody! i need a help! i am trying to model a vein where i can insert another fluid into the boodstream.The problem is I am not able to decide about how to inject this new fluid into the blood stream. If any one can help me I will be more than thankful!If u need any other details about this please let me know! thanks! Best wishes Aditya
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Old   March 23, 2003, 21:33
Default Re: injection in a vein
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Alex Munoz
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hello adtya akella

I guess you shoud made a multiphase analysis where the blood is the continuous phase and the "other" fluid correspond to the discrete phase. This type of analysis is called Eulerian-Eulerian approach for the prediction of two phase flows.

If you have not generated a mesh I guess you can create a two concentrical cylinder, where the internal one represent the discrete fluid jet, and the external one represent the continuous flow. Of course, the lengh of the external one should be 20 times the diameter of the internal cylinder.

I sugguest that you check a paper by xi-Quing Chen, Metin renksizbulut, xianguo Li (2001) Part.Part. syst. Charact. 18 (2001) 120-133, in order that you get an idea of the geometry and some of the results that you are looking for. The Work of Chen unfortunately for you, was a Lagrangian-Eulerian approach for gas as a discrete phase. However, his work could be a good start for you.

In addition I encourage you to search for paper related to CFD analysis for liquid-liquid flow, before you start your simmulation. I know it takes time and effort, but it will pay off.

I want you know that get results in CFD is easy, however, get accurate results is a challenge and evenmore in multiphase simmulations.

I wish you the best!

Alex Munoz
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Old   March 25, 2003, 03:50
Default Re: injection in a vein
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Alamgir
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Hi Aditya,

Just have a look on Multiphase Mixture model.... U can have the idea what things u need to do. Now u have to use blood as a primary phase which should be non newtonian fluid and another one could be newtonian fluid as a pluse input with user difine function (UDF).

Now how the geometry look like.... a small dia pipe with some length (as u want), any where of the pipe the should be an inlet with small dia as small a u want. So now u have one continuous inlet for the blood and small inlet for the injected fluid..

bye/Alamgir
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Old   March 25, 2003, 17:12
Default Re: injection in a vein
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aditya
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Hello Alex and Alamgir, Thankyou so much for those suggestions and ofcourse the wishes.I will surely work on them and hope I will get through the problem too else I will be back! Once again thankyou so much! Best Regards Aditya
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