Modeling the separation performance of depth filter considering tomographic data

Abstract

Fibrous depth filters are frequently used for the purification of gas streams with low dust loadings, as well as processes where a high initial filtration efficiency is required (e.g., clean rooms for aseptic production). One tool suitable for supporting the development of optimized filter media is the use of numerical simulations. The drawback of this technique is the high computational resources required. In this work, a new and fast approach based on a one-dimensional model was applied. Structural characteristics (e.g., porosity distribution and fiber diameter) of two different filter media were successfully determined using a novel X-ray microscope. These characteristics were incorporated in the filtration model, and their influence on the calculations was evaluated. It was found that the porosity distribution does have an impact on local (microscopic) deposition rates, but only a minor influence on the macroscopic filtration efficiency (around 3%). Benefits of the model are the application of measured structural data and the low computational expense. Compared to experimental data (VDI 3926 / ISO 11057), the prediction of the filtration efficiency can be improved by incorporating the structural data in the model.

Deformation Behavior of 3D Printed Auxetic Structures of Thermoplastic Polymers: PLA, PBAT, and Blends

“…The auxetic structural behavior measured by the conventional tensile testing machine illustrated a large deformation discrepancy between the upper as well as the lower rows and the middle three rows of the honeycombs. To achieve quantitative data for the analysis, in-situ CT tests with a combination of digital image correlation (DIC) are preferred, which allows for the calculation of the local displacement/strain maps [ 27 , 28 , 29 , 30 ]. A more detailed presentation of the CT test and DIC technique is shown in [ 27 , 28 , 29 , 30 ].…”

“…To achieve quantitative data for the analysis, in-situ CT tests with a combination of digital image correlation (DIC) are preferred, which allows for the calculation of the local displacement/strain maps [ 27 , 28 , 29 , 30 ]. A more detailed presentation of the CT test and DIC technique is shown in [ 27 , 28 , 29 , 30 ]. Furthermore, the tomographic scan can reveal the initial damage and the warpage caused by the 3D printing and the cooling process, respectively.…”

A continuous polytetrafluoroethylene foam-coating to glass fiber mat with superior self-cleaning, antistatic and high filtration efficiency performances

“…The VDI test of the filter can simulate the working conditions to test the filtration characteristics and filtration efficiency of the filter. 36…”

Experimental Investigations of Micro-Meso Damage Evolution for a Co/WC-Type Tool Material with Application of Digital Image Correlation and Machine Learning

“…Thereupon, no change or adaptation of the CT measurement software is necessary. For the analysis of the samples, the XRadia 520 X-ray microscope from Zeiss [51][52][53][54], which allows a resolution of less than 1 µm, was used in addition to the µCT system. One sample was firstly loaded in tension with a conventional traction machine until it broke.…”