Recent content by bzz77

Thanks for your reply, Dr. Claude. I'm not familiar with Borek (?). I'm not considering a specific reaction. I input the ions listed above with their published values, then the program uses Gibbs free energy minimization to calculate amounts of mineral and aqueous species. I am woefully...

I'm using a program for calculating chemical reactions, but I'm not a chemist. I will use the results for a different type of calculation. Sorry, this is probably a silly question. As input for the program, I am using a chemical system that someone published. it contains: SO4(2-), Ca2+...

Thanks a lot, Bobby. I expected that this would be something done routinely, so it is interesting to know that it isn't.

Thanks, Bobby. I'm thinking of a liquid that is not water, but that is essentially incompressible. it would be at temperatures high enough that water gas would be stable. I want to do some flow calculations and I'd like to get a rough idea of how compressible the liquid plus gas mixture would...

Thanks for your response, Bobby. I mean that if we have liquid and know its compressibility (it is approximately incompressible), then we add some gas bubbles to it (of known composition, let's assume H2O), then how can we calculate the mixture compressibility? Is this a matter of looking...

I want to know approximately how compressible a fluid can become when H2O bubbles are present. Does anyone know how to do this? Thanks.

Thanks everyone. I would also be curious to know how dS is measured. So it sounds like we can't measure G directly.

Thermodynamics--Gibbs free energy: what can we actually measure in the lab? Hi everyone: I am getting back into thermodynamics after a long absence and have realized that there are basics I have never understood. If a patient person could either explain or direct me to an online resource...

I am about to go and pick someone up, so I may not do your question justice. Make sure to ask if anything needs further clarification and I'll get back to you tomorrow... As far as your question about the U content of zircons in the early Earth, the U content probably wouldn't have been that...

Well, there are different ways of seeing your question. First of all, let's clarify a few things... A rock is made up of various minerals. Magma cools to form igneous rocks. Magma that is formed by melting of the Earth's mantle is about 1200 C and if it doesn't erupt, its composition changes...

Thanks again for going to so much trouble, Studiot. I'll definitely look that up. So far the only comparisons of FE and integrated FD I can find are by the competing groups, and I need something objective. Appreciate it.

Thanks a lot, Studiot.

Thanks Studiot. I'll look into that. Right now my choice is between integrated finite difference and finite element though. Thanks again.

Hello all: For modeling flow (or whatever) in a non-rectangular geometry, can anyone comment on whether the finite element method would be better or worse or the same as the integrated finite difference method? I'm reading some papers by competing groups (so I can decide which code to...

Hello all: I'm a newbie, trying to write/use code for solving a 2D advection-diffusion problem. I'm not sure how many boundary conditions I should have for the property that is being transported. In my problem, I have diffusion switched off (advection only). The property being...