I need experimental data for terminal velocity of Hexene/Hexane/similar alkanes falling droplet in air to validate my numerical scheme. In brief, I want to know if there is any data for droplets with density ratio less than water droplet in air. can anyone introduce any related work?
thanks
Dear Henk
Actually, I am using lattice Boltzmann method (LBM) for multiphase problems and falling droplet is one of my preliminary case studies. In order to simulate a physical substance we have to convert the physical units to LBM units. So, we have some scaling rules. I tried to validate my scheme for falling of water droplet, but it was not possible due to the some limitations of the numerical scheme and also computational cost. So, I need to find data for falling time/terminal velocity of another real substance with lower density ratio (i.e. less than 700) which helps me to choose reasonable parameters in LBM. I think, having the diameter and density of the substance are sufficient at this stage.
Best
Can't you just use the Stokes equation F = 6 pi epsilon v r? The viscosity of air (epsilon) should be tabulated somewhere.
Stokes equation Is not a good approximation, because the shape of droplet would change during the falling which affect the terminal velocity.
Perhaps this link could be helpful: http://home2.fvcc.edu/~dhicketh/DiffEqns/Spring11projects/Ben_Lynch_Gavin_Lommatsch/DiffEqProject/DiffEqProjectGavinBen.pdf
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