Several kinds of filters are used in vehicles such as fuel filters, oil filters and air filters.
Usually the main aim of development is to increase the efficiency of filtration and the reduction of the pressure loss.
The figures presented here show the flow conditions within a lorry's air filter. The pressure distribution is shown by
a contour plot in Pa. whereas the steam lines are coloured by the flow velocity in m/s.
For the volume flow rate of interest the predicted total pressure drop is 35 mbar. The measured pressure drop is 34 mbar.