# Problem with phase change - Relating to TEMPERATURE

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August 5, 2019, 01:12
Problem with phase change - Relating to TEMPERATURE
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Senior Member

Kumaresh
Join Date: Oct 2016
Posts: 349
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Hello Foamers, In my phase change problem, I want to set the liquid evaporation equal to interfacial temperature (saturation temperature).
My conditions at the interface (boiling plane) are as follows:
Quote:
 T= 100 (saturation temperature when phase change occurs) @T=100 --> [w(moisture content)->at high (-) temperature side =0] Based on it, mass and heat balances are calculated at interface as, Mass balance (r) = rho * alpha * (dx/dt) [kg/m2.s] (calculated at -> low (+) temperature side) Heat balance (-K dT/dx) = (r) * latent heat [W/m2]
TEqn.H
Quote:
 forAll(mesh.cells(), celli) { if (alpha[celli] <= scalar(0.1)) //10% of moisture { T[celli] = 373.0; //Tsat = 100deg - T[celli] = Tsat.value(); alpha[celli]= scalar(0); //Moisture content = 0 } } volScalarField VX = V.component(vector::X); // Compute mass source field (mass balance) (rho*alpha1*interface_VELOCITY) volScalarField mDot = -(rho*alpha*VX); // Compute energy source field using enthalpy of evaporation (energy balance) //hDot = -evapEnthalpy*mDot; { fvScalarMatrix TEqn ( fvm::ddt(rho*cp, T) // fvm::ddt(cp, T) - mDot * cp * gradTx - fvm::laplacian(K, T) // - fvm::laplacian(lambda/rho, T) ); TEqn.relax(); TEqn.solve(); }
Hereby, attaching the solver. and attached figure gives the equations and explanations about boiling and convection.
ENERGY EQU: rho*Cp*(delT/delt) = del/delx[K*delT/delx ] + r*cp*delT/delx + rho*delQ/delT (W/m3)
REF - Clear details here in this MANUSCRIPT ~ http://sci-hub.tw/https://doi.org/10...361(83)90225-9 I

I have partially set the condition of boiling in the solver, However, compilation is success - but there found no changes in results of alpha and temperature.
Some assistance will be highly helpful. Thank you
Attached Images
 ATTACHMENT_1_Boiling.jpg (110.9 KB, 13 views) ATTACHMENT_2_Convection.png (153.7 KB, 10 views)
Attached Files
 myboilingFoam_solver.tar.gz (112.8 KB, 8 views)

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