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what value to give coeffC and coeffE in phaseChangePRoperties?

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Old   February 21, 2020, 08:49
Default what value to give coeffC and coeffE in phaseChangePRoperties?
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Vignesh S P
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Hi,
Am trying to simulate evaporation and condensation of pentane inside a heat pipe. The solver I've selected is interCondensatingEvaporatingFoam in OpenFOAM v1906 by ESI.

I took tutorial case for that solver all the transport properties are given for both phases. But there is a file called phaseChangeProperites
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1812                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      phaseChangeProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

phaseChangeTwoPhaseModel constant;

constantCoeffs
{
    coeffC          coeffC [0 0 -1 -1 0 0 0] 250; // for FC-72
    coeffE          coeffE [0 0 -1 -1 0 0 0] 250;
}
within which coeffC is condensation Coefficient (1/s/K) and coeffE is Evaporation Coefficient (1/s/K).

i want what value to be fed into each coeff. for pentane. or how to determine these coeffc.

Thanks in advance.
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Old   March 6, 2020, 03:31
Smile tutorial case
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Muyiwa
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I'm a new user of OpenFoam and I need tutorial case of interCondensatingEvaporatingFoam solver to practice. Please kindly help me send the tutorial case in zipped format for interCondensatingEvaporatingFoam solver. Thanks for your good response.
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Old   September 8, 2021, 03:05
Smile Interfacial evaporation
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Hi Vignesh and everyone,

I am actually looking for a solver which calculated the interfacial area density, which seems to be present in the 2006 version of OF esi. I checked the source terms, and again it has similar CoeffE and CoeffC. It is not clear to me how to access the interface area density and what these coefficients are. Did you understand the coefficients? It would be of great help if you direct me to the relevant sources.

Thanks in advance for your time.
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Old   February 17, 2023, 05:23
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Filippo Azzini
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Dear Vignesh,
I'm also tryng to simulate heat pipes with this solver, but i have some problems to set-up my simulation, i'm asking if you had managed to simulate the evaporation and condensation cycles with this solver, thank you so much for your help
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Old   May 18, 2024, 16:48
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Quote:
Originally Posted by Filippo_azz View Post
Dear Vignesh,
I'm also tryng to simulate heat pipes with this solver, but i have some problems to set-up my simulation, i'm asking if you had managed to simulate the evaporation and condensation cycles with this solver, thank you so much for your help
Hello, were you able to progress using interCondensatingEvaporatingFoam? I am also looking at a similar problem, modeling thermosyphons.
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