Does anyone know of any papers that exist which deal with the CFD modelling of multiphase flows? Any answers greatly appreciated!

Check out http://public.lanl.gov/mww/PAPERS/author.html

if you want to model the multiphase flows using the two fluid approach where both the phases are given Eulerian and continuum approach papers by Kuipers Beckum from Netherlands published in Computers Chem engg vol17 would be useful. also u might look into the book by LS Fan Gas-solid flows.. and if u search on Google for Mfix documentation(which is fluent's code for multiphase flows)..u should be able to find it and its pretty handy hope that helps

kunal