Study on effect of common liquid hopper of parallel hydrocyclones on pressure drop
To reduce the pressure drop of the parallel hydrocyclones,a new type of common liquid hopper for the circumferential type was designed.The pressure drop and separation efficiency of four conventional parallel hydrocyclones with and without the common liquid hopper were measured experimentally.The flow field inside the parallel hydrocyclones was numerically simulated using Fluent software,and the influence of common liquid hopper on the air core,tangential velocity,and swirl stability were analyzed.The results showed that the pressure drop of the parallel hydrocyclones group with common liquid hopper was lower than that of the conventional group,while the separation efficiency remained unchanged.The average pressure drop reduced by 1.9％,and the maximum pressure drop reduced by 3.36％when the inlet velocity reached 5.0 m/s.Compared with conventional parallel connection,a common liquid hopper could form a bottom flow liquid seal,causing the disappearance of air core in the parallel hydrocyclones group,resulting in a reduction in turbulent energy dissipation.And at high flow velocity,the area of quasi forced vortices expanded,making the gradient of tangential velocity change smoother and the maximum tangential velocity remained unchanged.So these phenomena helped to reduce energy consumption.A parallel vortex flow system could be formed inside a common liquid hopper.In this system,each flow vortex was constrained by other vortices.The oscillation amplitude of the vortex core in the system was smaller than that of a single vortex,so its stability was stronger.This self stability of the vortex flow system in the common liquid hopper also enhanced the stability of the swirling flow in each hydrocyclone,which helped to reduce pressure drop.Therefore,the common liquid hopper could reduce the pressure drop of parallel hydrocyclones while maintaining separation efficiency,providing guidance for the design and application of circumferential parallel hydrocyclones.
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