|June 8, 2010, 14:25||
Microwave drying modeling
Join Date: Jun 2009
Posts: 11Rep Power: 8
Im trying to simulate the drying by microwave of different buildings material. A multiphysic problem with, electromagenetic, thermal and mass transfer coupled.
I treat the EM with a lambert law of energy penetration depending on the pemeabilty coupled with the moisture. The mass transfer i use a solid domain with liquid-vapour phases one attached and another (vapour) transported with a UDS diffusive equation.
I used a arrenious law to coupled the two phases ratio exchange and the traditional vapour saturation pressure with the desorption isotherm to calculate the quasistacionary equilibrium in each time step.
All is coupled in a multiple UDF schema.
I have detected from the diffusivity values obtained from the literature that i obtain overestimated drying times. The diffusivity value in the material pannel is in kg/m-s instead of m2/s, this mean that the diff coef is multiplied by the density?
I know that the transient term in the scalar transport equation is multiplied by the density but no the diffusive term.
I remake my calculations with the diffusive coefficent multiplied by the density and i obtain pretty close to the reality values. Also i check this on CFX that use traditional m2/s units.
Can any one explain this?
Thanks in advance.
|Thread||Thread Starter||Forum||Replies||Last Post|
|May Focus Area: Turbulence Modeling||Jonas Larsson||CFD-Wiki||0||May 2, 2006 11:48|
|Modeling drying in porous media||Oliver||Main CFD Forum||0||January 14, 2005 12:41|
|complex (?) drying modeling: diffusion/multiphase||kilroy||FLUENT||0||July 7, 2003 03:57|
|Modeling Flow/Saturation/Absorption in Fibers||Gene Dougherty||Main CFD Forum||0||June 6, 2003 14:49|
|CFD Modeling of Two-phase Flow in Small Dia.Tubes||Eric Poindexter||Main CFD Forum||2||September 22, 2000 09:21|