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  1. montavala

    residual stress in laminates

    I guess it should not be too complicated... I have found an equation to calculate the residual stress in the coating on the substrate. It is given in some papers considering Thermal barriere Coatings: sigma(ox)= -...
  2. montavala

    detection of CO2 with a cheap method

    Hello. I have a problem of detection of CO2 with a cheap method. I read something about detection over the KOH solution measuring the conductivity (or the pH value). Does somebody knows more about it? The exhausted gas from my furnace contains actualy both CO and CO2, but I would like to convert...
  3. montavala

    moving boundary - PDE numerics

    Do you have a reference for the solution of this problem?
  4. montavala

    moving boundary - PDE numerics

    It is more a question of solving equations.
  5. montavala

    moving boundary - PDE numerics

    Answer to Hacksaw: I will also have an equation for the oxygen diffusion plus the reaction with SiC. It is the typical parabolic law: (m/A)^2=kp*t. m-weight change, A-surface, t-time, kp-const. On the other side I will also have the reaction of SiO2 with H2O from the air which will case the...
  6. montavala

    moving boundary - PDE numerics

    Hello. I have a problem with numerical mathematics and programming. My case is: I have SiC layer covered with another one (mixture-oxide of alumina and silica (mullite)). This is exposed to the air on typical t=1400C. The O2 diffuses through the mullite layer, and reacts with SiC, giving SiO2...
  7. montavala

    Thermal loading and spallation

    My system consists of substrate (which is a carbon composite) with CVD deposited SiC layer and with oxide coating deposited over SiC. The cracking of the SiC layer occurs during cooling after the deposition. The same happens later with the oxide layer. I saw that many authors mentioned FE...
  8. montavala

    Measuring the resistivity of thin layers

    Hello, Here is my problem: I have a thin layer of SiC over a Carbon composite. The resistivity of Carbon composite as well as the one of SiC is not determined. Overall resistivity of a sample (20x20x2) I can define through the "van der Pauw" method, but their individual...
  9. montavala

    Equlibrium absorption isotherm (air-H2O-isopropanol)

    I need an equilibrium absorption isotherm (or what is it called anyway)for system Air-H2O-isopropanol, where water is the only active component (of importance in my system). If you have some data for some other alcohol, it can also be helpful. Also if you have a data on difussivity of water...
  10. montavala

    Exams

    I am a teaching asistent on agricultural department of Belgrade University, Yugoslavia. I am new there and I need some help. I wish if I can find some web page with exams, exerices or examples from Chemical engineering. Especially those which are connected to Agricultural technology. If there...

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