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-   -   how to give two different fluid at the different inlets ? (http://www.cfd-online.com/Forums/fluent/102005-how-give-two-different-fluid-different-inlets.html)

lucky_m_m May 19, 2012 16:13

how to give two different fluid at the different inlets ?
 
Please tell me how to give two different fluids at the inlet. The problem which I am dealing is of the heat exchanger which deals with two different types of liquid water and ethanol, so at the inlet surface of both the fluids I need to give the particular fluid only, Please tell me what model to use, I have used velocity inlet condition for the inlet.

ravi_cfd May 21, 2012 07:15

hi ,

first of all you should enable "species Transport " model.

then define the respective fluid's mass / mole fractions at their corresponding inlets.

liddil May 29, 2012 07:07

I'm a beginner in fluent but what about model two different nozzles and in 1st nozzle will be 1 fluid, in second nozzle 2nd fluid?
Or if you need to model two different fluids mix togehter maybe try "tutorial 19 - Using the Mixture and eulerian Multiphase Models" .

Jabba June 12, 2012 14:21

Quote:

Originally Posted by liddil (Post 363553)
I'm a beginner in fluent but what about model two different nozzles and in 1st nozzle will be 1 fluid, in second nozzle 2nd fluid?
Or if you need to model two different fluids mix togehter maybe try "tutorial 19 - Using the Mixture and eulerian Multiphase Models" .

Are you considering the two fluids immiscible?

If so, you may use VOF or Eulerian Multiphase model with the Immiscible Fluids option checked. Then you can change the boundary type to mass-flow inlet. You should be able to define two different inlet velocities for each one of the phases.

delaneyluke June 13, 2012 04:22

For your case please use the "Multiphase mixture model" and define your fluids by volume fraction at inlet
Eg; Ethanol inlet has Ethanol VF =1 and Water VF = 0..... same for the other inlet

Regards
Luke

sajid December 7, 2012 15:48

i want to give fluid and solid particle mixture in shell and tube heat exchanger on shell side at the same inlet .how to do this ? please help me .i m very worried about it because its my final year project .i will be very thankful.


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