Dimensional analysis of the cleaning pulse intensity in a surface filter test rig

A set of five non-dimensional parameters was developed to scale the pressure pulse intensity in test rigs for flat-sheet surface filter media. Four of these parameters link geometrical proportions of the clean gas section of the device, the media permeability, the ambient pressure and the tank pressure. The fifth parameter, related to valve opening time, is shown to be insignificant during practical operation. Experiments show that the scaling laws for the pressure pulse signal are reflected accurately by this set of non-dimensional parameters. The measurements were performed on a VDI type testing unit in various combinations of geometrical and operating parameters and with three media permeabilities.The results imply that differences in regeneration pulse intensity between filter testers which differ substantially in any one or more geometric proportions, such as those according to the VDI and JIS norms, cannot be reconciled by adjusting the tank pressure to a definite value.

The regeneration intensity in a filter tester was described by a set of 6 non-dimensional parameters. A parameter study was performed to identify negligible parameters. The experimental verification of the model proved its validity concerning the geometrical parameters. The results imply that differences in regeneration intensity due to different geometry cannot be reconciled by adjusting the tank pressure.Figure optionsDownload as PowerPoint slideResearch highlights
► Regeneration intensity of a filter tester is described by dimensional analysis
► Valve opening time is negligible for regeneration intensity
► Media permeability and tank pressure show significant influence
► Geometry of the filter tester shows significant influence