Cavalcante Daniel C M, Magalhães Hortência L F, Neto Severino R Farias, Gomez Ricardo S, Delgado João M P Q, Lima Antonio G B, Vasconcelos Danielle B T, Silva Márcio J V, Farias Daniel O, Queiroz Suelyn F A M, Santos Antonio C Q, Tito Thâmmara L H, Silva Emmanuel F M
Federal Institute of Education, Science and Technology of the Sertão Pernambuco, Serra Talhada 56915-899, Pernambuco, Brazil.
Science and Technology Institute, Federal University of the Vales do Jequitinhonha and Mucuri, Diamantina 39100-000, Minas Gerais, Brazil.
Membranes (Basel). 2024 Aug 6;14(8):171. doi: 10.3390/membranes14080171.
A conventional hydrocyclones is a versatile equipment with a high processing capacity and low maintenance cost. Currently, several studies aim to alter the typical structure of the conventional hydrocyclone in order to modify its performance and purpose. For this, filtering hydrocyclones have emerged, where a porous membrane replaces the conic or cylindrical wall. During the operation of this equipment, in addition to the traditionally observed streams (feed, underflow, and overflow), there is a liquid stream resulting from the filtration process, commonly referred to as filtrate. This work proposes to numerically investigate the solid particle/liquid water separation process in a filtering hydrocyclone using the commercial software Ansys CFX 15.0. The proposed mathematical model for the study considers three-dimensional, steady state and turbulent flow, using the Eulerian-Eulerian approach and the Shear Stress Transport (SST) turbulence model. This study presents and analyzes the volume fraction, velocity, and pressure fields, along with flowlines and velocity profiles. The results indicate that the proposed model effectively captures the fluid dynamic behavior within the filtering hydrocyclone, highlighting higher pressures near the porous membrane and a higher concentration of solid particles in the conical region, with water being more concentrated in the cylindrical part of the hydrocyclone. Additionally, the findings show that the volumetric flow rate of the filtrate significantly influences the internal flow dynamics, with conventional hydrocyclones demonstrating higher pressure gradients compared to the proposed filtering hydrocyclone.
传统水力旋流器是一种多功能设备，具有高处理能力和低维护成本。目前，多项研究旨在改变传统水力旋流器的典型结构，以改变其性能和用途。为此，出现了过滤式水力旋流器，其中用多孔膜取代了圆锥形或圆柱形壁。在该设备运行期间，除了传统观察到的物流（进料、底流和溢流）外，还有过滤过程产生的液流，通常称为滤液。本文提出使用商业软件Ansys CFX 15.0对过滤式水力旋流器中的固体颗粒/液态水分离过程进行数值研究。本研究提出的数学模型考虑三维、稳态和湍流流动，采用欧拉-欧拉方法和剪切应力输运（SST）湍流模型。本研究展示并分析了体积分数、速度和压力场，以及流线和速度剖面。结果表明，所提出的模型有效地捕捉了过滤式水力旋流器内的流体动力学行为，突出了多孔膜附近的较高压力以及锥形区域中较高浓度的固体颗粒，而水在水力旋流器的圆柱形部分更为集中。此外，研究结果表明，滤液的体积流量显著影响内部流动动力学，传统水力旋流器与所提出的过滤式水力旋流器相比显示出更高的压力梯度。
