Bent pipe deposition

 

The deposition modeling can be validated by simulating droplet deposition inside a bent pipe and compare the results with existing experimental (inertia driven regime) and theoretical (diffusion driven regime) data. We use the experimental deposition data from Pui et al. in terms of the deposition efficiency (i.e., the ratio of the deposited mass to the inflow mass) as a function of the droplet Stokes number (St). We select the case with the Reynolds number equal to 1000, and use a wall-refined mesh. We use the zero-gradient deposition velocity model in order to compute the deposition velocity of droplets at the wall of the bent pipe. This case was discussed extensively in the PhD thesis of Frederix (2016). The validation case is available inside the AeroSolved code in 'cases/validation/bentPipeDeposition'. The validation case can be executed by calling the following scripts for preparation, running and post-processing: prep.sh, run.sh (will take a long time) and post.sh. The post.sh script requires Python with Matplotlib to be installed, and creates plot.pdf (see below) that shows the deposition efficiency (DE) as a function of the Stokes number (St) for the simulations and the experimental data of Pui et al. (1987).

plot bent pipe