COMSOL simulation for heat and mass transfer across membrane for membrane...
Hi, For your information, I am developing a COMSOL simulation for the direct contact membrane distillation (DCMD) process. It is actually a process which involve the heat and mass transfer from the...
View ArticleProblems with boundary layer mesh in Conjugate Heat Transfer NITF with CHDS
Dear Dr. Magnus Ringh I want to simulate the heat and mass transfer during the drying of a granular material. A heated air is allowed to pass through a layer of the granular materials to transfer the...
View Article4th order pde
Hello everybody, I have 4th order pde equation (Navier sokes lubrication aproximation). As I know I need to make intermediate depended variables of 2nd order. Maybe somebody could tel me where I need...
View ArticleMeshing problems with Coupled conjugate heat transfer (nitf) with Transport...
Dear Sir. Bjorn Bretz, I have posted this problem for several times already to this forum to some users but I could not get any respond. Because you're from COMSOL Sweden, hopefully I can get this...
View ArticleConstant temperature through tubes ; "No" heat exchange
Hello Model can be found: www.dropbox.com/sh/mvgwp1qbc0dcwa6/YhJhuLItkj My model of a shell and tube heat exchanger has a constant temperature-profile. It's possible that steady state inside the model...
View ArticleHeat transfer
Hi. What i noticed in your heat transfer node is that there is no temperature node. i think that is the one causing the problem. I suppose your fluid is your heat source to create the thermal...
View ArticleConjugate heat transfer and flow through porous media
Hi, Im trying to simuate natural convection in a room (2D conjugate heat transfer). I need to be able to have a thin screen inside the room wich should be semi-permeable to the airflow from natural...
View ArticlePut if condition to stop simulation
Hi, May somebody can help with following question: How can I put if statement to stop simulation iterations? for example I am running conjugate heat transfer I would like to stop simulation when the...
View ArticleProblems with using deriviative opertaor (4.3.0.151)
I'm using the general PDE module coupled with creeping flow. The PDE solves the electrostatics problem (Laplace equation) and finds the electric potential (phi) everywhere. I'm trying to put in a slip...
View ArticleInviscid Flow
Hi, I want to model a 2d inviscid flow in comsol v4.1, but when I set Dynamic viscosity=0 , I have some convergence problem. It can be solved by using full Navier-Stokes Equations, but when I set the...
View ArticleNo species released when using Transport of Species model
Hi, I am trying to add some tracer to the bulk flow. In Study 1, I am running a Steady air flow, and then in Study 2, I add a tracer to the flow. The tracer is released from a point (a source using...
View ArticleTo demonstrate a "sieve" at the particle tracing module
Hi all, now I'm trying to demonstrate a particle sieve using the particle tracing module. I expected that the particles bigger than the pore size of the sieve could be filtered and stuck on the sieve...
View ArticleWater droplet falling through air on a structured surface
Hi, Im new to comsol. I was trying to model a water droplet falling onto a solid substrate. The droplet should fall through air and then i should be able to calculate contact angles at various...
View ArticleMelting Front and Free Surface
Dear all, I'm currently attempting to build a model similar to the "Tin Melting Front" in the model library. This model describes the melting of a metal through the Stefan problem and models the...
View ArticleHeat transfer liquid/solid inteface in the Glass of Water example
Hi all, Im having trouble to adapt the example of the glass of water (Heat transfer module/Tutorial Models/cold_water_glass) that comes with Comsol. What I want to do is to set the temperature of the...
View Articlea request
Hi I want to simulate the 2D problem in which a sphere moves freely through a fluid with a finite velocity and study its time dependent profile but I can't move the sphere anyway. I used the "moving...
View Articlea request
Hi I want to simulate the 2D problem in which a sphere moves freely through a fluid with a finite velocity and study its time dependent profile but I can't move the sphere anyway. I used the "moving...
View ArticleAir loss into porous media effect on velocity
Hello all, I am trying to model air up a small hole (10 m long but very narrow). On one side of the hole there is a porous media which should cause air to be lost from hole into the media. I would...
View Articlehelp in choosing a model
Hi, I an trying to model a liquid solution,that contains particles,that enters as a drop(hemisphere) to a pipe full with air. Between the air and the solution there is a surface tension. I am trying to...
View ArticleAir loss into environment boundary condition
If I have a box of porous media and an inlet pressure on the bottom edge, no slip on the right and left edge, what boundary condition would I need to apply on top edge to allow for mass loss into the...
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