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Saturated model species losing mass - multiphaseEulerFoam |
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April 12, 2022, 17:18 |
Saturated model species losing mass - multiphaseEulerFoam
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#1 |
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Cássio Césio Lopes Azevedo
Join Date: Feb 2022
Posts: 2
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Hi All,
I'm trying to simulate the drying of water present in one phase. For that, I'm using the multiphaseEulerFoam solver in Openfoam8. The problem I found is that the two species (“fibras” “H2O”) present in the phase (particles) are losing mass. phaseProperties Code:
type interfaceCompositionPhaseChangeMultiphaseSystem; phases (particles gas); particles { type multiComponentPhaseModel; diameterModel constant; constantCoeffs { d 1e-2; } alphaMax 0.62; residualAlpha 1e-6; } gas { type multiComponentPhaseModel; diameterModel constant; constantCoeffs { d 1; } residualAlpha 0; } blending { default { type linear; minFullyContinuousAlpha.gas 0.7; minPartlyContinuousAlpha.gas 0.3; minFullyContinuousAlpha.particles 0.7; minPartlyContinuousAlpha.particles 0.3; } heatTransfer { type linear; minPartlyContinuousAlpha.gas 0; minFullyContinuousAlpha.gas 1; minPartlyContinuousAlpha.particles 0; minFullyContinuousAlpha.particles 1; } diffusiveMassTransfer { $heatTransfer; } }; surfaceTension ( (gas and particles) { type constant; sigma 0; } ); aspectRatio ( (gas in particles) { type constant; E0 1.0; } (particles in gas) { type constant; E0 1.0; } ); drag ( (particles in gas) { type GidaspowErgunWenYu; residualRe 1e-3; swarmCorrection { type none; } } ); virtualMass ( ); interfaceComposition.gas ( (gas and particles) { type saturated; species ( "H2O" ); Le 1.0; saturationPressure { type ArdenBuck; } } ); interfaceComposition.particles ( ); heatTransfer.gas ( (gas in particles) { type spherical; residualAlpha 1e-4; } (particles in gas) { type RanzMarshall; residualAlpha 1e-4; } ); heatTransfer.particles ( (gas in particles) { type spherical; residualAlpha 1e-4; } (particles in gas) { type RanzMarshall; residualAlpha 1e-4; } ); diffusiveMassTransfer.gas ( (gas in particles) { type spherical; Le 1.0; } (particles in gas) { type Frossling; Le 1.0; } ); diffusiveMassTransfer.particles ( (gas in particles) { type Frossling; Le 1.0; } (particles in gas) { type spherical; Le 1.0; } ); phaseTransfer ( ); lift ( ); wallLubrication ( ); turbulentDispersion ( ); interfaceCompression (); // Minimum allowable pressure pMin 10000; // ************************************************************************* // Any idea on how to fix this? Thanks Cassio thermophysicalProperties.gas Code:
thermoType { type heRhoThermo; mixture multiComponentMixture; transport sutherland; thermo janaf; equationOfState perfectGas; specie specie; energy sensibleInternalEnergy; } species ( air H2O ); H2O { specie { molWeight 18.0153; } thermodynamics { Tlow 200; Thigh 3500; Tcommon 1000; highCpCoeffs ( 3.03399 0.00217692 -1.64073e-07 -9.7042e-11 1.68201e-14 -30004.3 4.96677 ); lowCpCoeffs ( 4.19864 -0.00203643 6.5204e-06 -5.48797e-09 1.77198e-12 -30293.7 -0.849032 ); } transport { As 1.67212e-06; Ts 170.672; } } air { specie { molWeight 28.9596; } thermodynamics { Tlow 200; Thigh 3500; Tcommon 1000; highCpCoeffs ( 3.57304 -7.24383e-04 1.67022e-06 -1.26501e-10 -4.20580e-13 -1047.41 3.12431 ); lowCpCoeffs ( 3.09589 1.22835e-03 -4.14267e-07 6.56910e-11 -3.87021e-15 -983.191 5.34161 ); } transport { As 1.67212e-06; Ts 170.672; } } Code:
thermoType { type heRhoThermo; mixture multiComponentMixture; transport const; thermo hConst; equationOfState rPolynomial; specie specie; energy sensibleInternalEnergy; } species ( fibras H2O ); H2O { specie { molWeight 18.0153; } equationOfState { C (0.001278 -2.1055e-06 3.9689e-09 4.3772e-13 -2.0225e-16); } thermodynamics { Cp 4195; Hf -1.5879e+07; } transport { mu 3.645e-4; Pr 2.289; } } fibras { specie { molWeight 9.72; } equationOfState { C (0.000680272108843537 0 0 0 0); } thermodynamics { Cp 3090; Hf 0; } transport { mu 0; Pr 1; } } p { margin-bottom: 0.25cm; line-height: 120% } |
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April 13, 2022, 11:27 |
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#2 |
Member
Vitor Monteiro
Join Date: Nov 2020
Posts: 32
Rep Power: 5 |
I'm facing the same problem, Cassio.
Using OF8 and the same solver, I could not avoid the "evaporation" of carbon.particles instead of H2O.particles only. My continuous fase is composed by air.gas and H2O.gas. So I just want H2O.particles turning into H2O.gas. However, carbon.particles species is also changing and "evaporating". Does anyone know how to deal with it? |
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interfacecompositionmodel, multiphaseeulerfoam, water |
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