Fibrous ﬁlter media are made of small ﬁbers (micro and nanoscale). In these cases, the Knudsen number can be appreciable and the slip phenomenon on the ﬂuid boundary surfaces should be considered. For this purpose, the mesoscopic approach lattice Boltzmann method (LBM) can be applied to predict the ﬂow, with appropriate boundary conditions (BC). This paper analyzes a ﬁbrous microﬁlter, including the construction of the geometric model fromscanning electronmicroscope (SEM)images, and the comparison with experimentalresults and macroscopic approachmodeling. A slip condition was implemented in open-source code OpenLB, based on specular reﬂections of the populations. The validation of the proposed boundary condition was carried out by simulations in a 2D channel, disposed at 45 and 90 degrees, and simple cases of a ﬂow around an octagon. The experimental order of convergence (EOC) was evaluated for all cases and the results of the pressure drop around the octagon were comparedtodataobtainedbyamacroscopicapproach. Agood agreementbetweenthe pressuredropthrough the ﬁlter media and the results obtained numerically and experimentally was observed. These ﬁndings endorse the accuracy of the implemented slip BC and the importance in considering this phenomenon in microscale systems.
|Titolo:||Microfiber filter performance prediction using a lattice Boltzmann method|
|Data di pubblicazione:||2018|
|Digital Object Identifier (DOI):||10.4208/cicp.OA-2016-0180|
|Appare nelle tipologie:||1.1 Articolo in rivista|