This paper deals with testing of a nanofibrous filter by submicron monodisperse polystyrene particles of several sizes. The nanofibrous materials made by the electrospinning technology are very potential as a liquid filters. During the development of new filters it is necessary to determine reliably one of the most important parameter – filter efficiency. In this article the filtration efficiency is measured on the basis of the visualization of a filtration process. A laser sheet is aimed to the place where a filter mounted is. A digital camera records the flow in the laser sheet and by an image analysis the local filtration efficiency is calculated. The experiments were carried out on the water filtration setup including the filtration chamber with an optical access. The bubble point test is used for determination of the maximum, medium and minimum pore size of the filtration textile. The information about pores is compared to the local filtration efficiency and pressure drop of a nanofibrous textile tested by submicron monodisperse particles.Keywords: Nanofibrous filter, water filtration, flow visualization
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