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The beads in a packed bed are usually distributed randomly. Therefore, on a macroscopic scale, a fluid flows uniformly through such a porous medium. For thin porous media, deviations are known near the regions of confinement. This so‐called wall effect is extensively investigated in literature for circular confinements. In this work, the wall effect and the flow through porous media in a rectangular...
Der Einfluss des Wandeffekts auf die Durchströmung poröser Kugelschüttungen in ebenen Begrenzungen wird untersucht. Dazu werden Versuche zur Porositätsverteilung und zur geeigneten Modellierung der Permeabilität im Wandbereich durchgeführt. Damit werden für sich überlagernde Wandeffekte Korrekturfaktoren für die übliche eindimensionale Berechnung des Volumenstroms und die Permeabilität abgeleitet.
Wafers are usually coated by using spin‐coating, where centrifugal forces are used to spread a droplet on the rotating wafer. This flow is unstable to the fingering instability, where several segments of the wetting front spread faster than the average, resulting in several fingers. The liquid flows via the existing fingers while the area in between does not get coated. A precise experimental investigation...
Lithium‐ion batteries are composed of several single cells, each consisting of conductive, impermeable electrodes made of aluminum and copper. Both are coated with a thin, porous layer on both sides (collectors) and a thin, non‐conductive and permeable layer is separating them. As the layers are stacked, the liquid enters the battery at all front edges, while the gas is trapped inside. To estimate...
To examine the filling process in a lithium‐ion battery, a numerical model to characterize the displacing flow of a liquid in air‐filled pores of thin heterogeneous porous materials is elaborated. The investigation is based on the volume‐averaged Navier‐Stokes equations for small Reynolds numbers, using a volume‐of‐fluid method to cover the multiphase flow. The flow is investigated with respect to...
Thin droplets spreading on a solid substrate are investigated, with a special focus on temperature effects. The aim is to manipulate the fingering instability which may occur in the spreading in a spin coating process. The analysis bases on lubrication approximation, valid for flat thin droplets, which usually is the case. The dynamic of the wetting is implemented by using a generalized law of Tanner,...
Thin‐film flows are involved in many coating processes, where it is desirable to achieve thin and homogeneous fluid layers. In the present investigations, we treat droplets, spreading on rotating solid substrates. Micro‐scale effects appear, firstly, at the wetting front, where the film height tends to zero. Secondly, micro‐scale effects may appear at other locations, where the free liquid/gas‐interface...
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