Inversion of droplet collapse by imposing simple shear flow
by
Ehsan Amiri Rad(KTH & Hakim Sabzevari University, Iran)
→
Europe/Stockholm
122:026
122:026
Description
Minimum free energy of a two phase system is corresponded to minimum interface area. This means, when several droplets are suspended in the other environment, the number of droplets decreases in time while mean radius of them increases and after long time there will be only one big droplet. This phenomenon is called coarsening which happens by two different mechanisms: collapse and coalescence. The collapse mechanism occurs when the droplets are far enough to avoid coalescence. In this case, there is a mass transfer from smaller droplets (with higher chemical potential and pressure) to larger ones (with lower chemical potential and pressure).
We modeled this phenomenon using different approaches of free energy LBM and investigated the effects of simple shear flow. The results show that, shear flow can change the growth rate. Also at the late stage (when there are just two droplets) if the shear rate be greater than a critical value, collapse is stopped, droplet coarsening is inverted and smaller droplet grows.
