|
[Sponsors] |
How to Find Temperature Field of Two Phase Flow? |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
October 15, 2017, 09:32 |
How to Find Temperature Field of Two Phase Flow?
|
#1 |
Senior Member
|
Dear all,
Hello. Hope all are well. I am new at two phase flow so forgive me if I ask. Can anyone tell me how to find the temperature of a two phase nanofluid in an Eulerian Eulerian homogeneous model in CFD-Post?The flow field doesn't change compared to two phase flow as its single coupled that I understand. I know there is a variable for the base fluid i.e. Basefluid.Temperature and there is a variable for particle i.e. particle.Temperature but how can I find and plot contour of the two phase fluid itself i.e. both fluids combined? I have tried adding temperatures of the two fluids as an expression and that using it as a variable and then plotting its contour but that gives me a wrong value i.e. just the addition of individual values of the two fluids. Also, the base fluid temperature field in the longitudinal direction is less than that of single phase nanofluid. Why is that? I was expecting it to be higher in two phase flow. Would be extremely grateful if somebody could shed some light on this. Thanks. |
|
October 15, 2017, 18:46 |
|
#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
First of all - and I think we have talked about this before - the concept of "phase" does not really exist at the nanofluid level. You are talking molecular level stuff here, so all sorts of different considerations come into play. Are you sure a CFD solver is suitable for this work?
Putting those misgivings aside..... If you want to work out some average temperature of the two phases then you are going to have to write an expression to evaluate it. It will probably rely on the mass of each volume fraction in a unit volume to give a mass weighted average temperature. But you are going to have to define a variable to do this as nothing is built in. |
|
October 16, 2017, 01:27 |
|
#3 |
Senior Member
|
Yes. You're right Glenn. Thanks. I am just comparing and experimenting with nanofluid two phase simulation. I think CFD Solver may solve it. You said something about "mass of each volume fraction in a unit volume to give a mass weighted average temperature". What should be the expression? I know this isn't built in and I'll have to make a variable after creating expression. Hope to hear from you. Thanks again!
|
|
October 16, 2017, 01:32 |
|
#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
The function would be very simple, something like
(Phase1.vf*Phase1.Density*Phase1.Temperature+Phase 2.vf*Phase2.Density*Phase2.Temperature)/(Phase1.vf*Phase1.Density+Phase2.vf*Phase2.Density ) |
|
October 16, 2017, 03:05 |
|
#5 |
Senior Member
|
Thanks again Glenn. One more question through. Does the same principle apply for calculating other variables as well, e.g. my interest lies in calculating heat transfer coefficient field? Like (Phase1.vf*Phase1.Density*Phase1.Wall Heat Transfer Coefficient+Phase 2.vf*Phase2.Density*Phase2. Wall Heat Transfer Coefficient)/(Phase1.vf*Phase1.Density+Phase2.vf*Phase2.Density ). Thanks.
|
|
October 16, 2017, 06:25 |
|
#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
The equation was just a general mass weighted average. You can average anything you like using it.
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
solid-liquid two phase flow for two phase Euler Foam | Jack_Kerouac | OpenFOAM Running, Solving & CFD | 1 | November 1, 2017 01:45 |
is internalField(U) equivalent to zeroGradient? | immortality | OpenFOAM Running, Solving & CFD | 7 | March 29, 2013 02:27 |
Errors running allwmake in OpenFOAM141dev with WM_COMPILE_OPTION%3ddebug | unoder | OpenFOAM Installation | 11 | January 30, 2008 21:30 |
fluid flow fundas | ram | Main CFD Forum | 5 | June 17, 2000 22:31 |
I wish to find the proper model to validate the temperature field. | G.H.Lee | Main CFD Forum | 1 | May 6, 1999 03:05 |