Hello,

I am looking for models to solver multicomponent fuel cavitation. If you have any papers or model information, I kindly request your help.

What are the physical effects of multicomponent? do they increase or decrease cavitation? Any thoughts?

Thanks,

CFDtoy

In multicomponent systems diffusion becomes the limiting factor for cavitation (generally). In single component it is mechanically (or sometimes thermally) limited meaning the bubble is expanding at a rate limited by how fast the surrounding liquid can be pushed away. So for single component you can use the Rayleigh-Plesset bubble growth equation, for multicomponent it is more a diffusion type equation. That also implies that in multicomponent systems cavitation is normally decreased (less violent) as the timescales for diffusion of gas in liquid tend to be large. But this does depend on all properties ofcourse

Thanks Bart for the nice explanation.

Also, have you noticed any multicomponent cavitation simulation papers or notes..theses..? I have seen very few work in this area but again in the Lagrangian framework.

Any relevant material in the Eulerian Framework would definitely be great. Again, thanks for your kind reply.

There is indeed little work done in this area (at least published). I'll see what I can do. You can have a look in the volcano/geophysics section. When a volcano erupts there is a fast degassing of the magma (water vapor, CO2 coming out of solution). This is multicoponent cavitation. There is some published work in this area.

Thanks again for the quick reply Bart ! I am currently trying to include the multicomponent effects into a Eulerian based Cavitation model. I am thinking of doing the multicomponent in the following way.

I could do modeling of the multicomponent within the liquid and use the effect density as the liquid density while the vapor density is constant. I would still be solving incompressible flows but actually the density of liquid changing with space and time due to different components? Do you think this is logical?

For this purpose, do i need to solve diffusion equation for both the components in all the cells to keep track of their concentration? Now if so, my concern is, this is little expensive and ...in high speed flows, does multicomponent diffusion really dominate?

Thanks again for your wonderful discussion. If you could kindly fwd some papers that you were referring to, that would be really great. Appreciate your very kind help.

CFDtoy