Abstract: Slotted sieves are used for separation of different phases and are applied in various engineering applications, including their widespread use in chemical and petrochemical industry. Physical features of sieves and dynamic properties of flow through a slotted sieve affect friction, which can be the cause of significant portion of flow resistance. Due to the fact that such research is scattered in literature, there is a need for more research in the field of prediction of friction for various operating parameters, which is needed to properly establish pipeline characteristics and which can lead to minimisation of losses for various set of values of slotted sieves design and operating parameters. The aim of the paper is to develop semi-empirical function describing frictional coefficient in a turbulent flow through slotted sieve. Experimental measurements of the frictional coefficient were conducted in three selected sieves, with a wide range of gaps from 0.22 mm to 1.02 mm, opening area ranging from 16.32% to 43.51% and shape coefficient of working rods from 0.17 to 0.24. A new function describing frictional coefficient has been developed and validated. The semi-empirical function depends on physical features of a slotted sieve, like opening area, shape coefficient, and dynamic properties of a flow represented by Reynolds number.
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