Three different filter media are modelled. They all consist of the same two types of glass fibers (dual phase). The distribution of the thicker fibers over the media thickness (height) is the same for all models. However, the thinner fibers are distributed differently over the thickness of the filter media . The three models are called homogeneous model, linear increasing model, and exponentially increasing model. The naming is based on the distribution of the thinner fibers through the thickness of the filter media. To make the three models comparable with each other, they were modelled to all have the same pressure drop in the clean state. To ensure this, FlowDict simulations were used to guide the choice of geometric model parameters.
The simulation steps consist of modelling the filter media with different spatial distributions of the two types of fibers, simulating the clean fluid flow through the filter media and finally simulating the particulate flow. The simulation provides all details on deposition location and pressure drop over time.
Filtration simulations on the three different models were run using the FilterDict module of GeoDict®. Filter life time simulations were carried out using multi pass filtration runs. In a multi pass simulation, fluids move in a circuit through the system, and the particle size distribution and concentration in front of the filter change over time. Outputs of these simulations are pressure drop, filtration efficiency and count/mass of the deposited dust as a function of time. The results show that...
Session: F4 - Filter Media - Numerical Methods for Optimized Media Design I
Day: 14 March 2018
Time: 16:45 - 18:00 h