文献类型：期刊文献

英文题名：CFD simulation on effects of conical section length on flow field and separation performance of hydrocyclones

作者：Tian, Jinyi[1,2];He, Fangbin[1,2];Wei, Caijie[3];Cao, Asheng[3];Yuan, Fei[3];Li, Han[1,2];Zhang, Dongge[1,2];Yang, Xuejing[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Environm Risk Assessment & Control Chem Pr, Minist Ecol & Environm, Shanghai 200237, Peoples R China;[3]Shanghai Environm Protect Grp Co Ltd, Shanghai 200237, Peoples R China

年份：2026

卷号：87

外文期刊名：JOURNAL OF WATER PROCESS ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001741856700001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 52570036) .

语种：英文

外文关键词：Hydrocyclone; Conical section length; Cone angle; Particle rotation; Separation efficiency

摘要：Hydrocyclones are increasingly used in environmental engineering, for example, for the separation of continuous-flow aerobic granular sludge. The conical section is the primary separation zone of a hydrocyclone. In this work, a low-Reynolds-number Reynolds Stress Model coupled with a rotation-aware Discrete Phase Model was used to simulate hydrocyclones with cone angles ranging from 5 degrees to 180 degrees, using cone angle to parameterize conical length and clarify its control over the flow field and separation behavior. The results show that separation efficiency decreases with increasing cone angle, while the flow split ratio is unaffected. Small and large cone angles correspond to low energy losses, whereas energy consumption peaks in the 40 degrees-120 degrees range, with the 60 degrees configuration giving the largest pressure drop. Small cone angles tend to cause short-circuiting of fine particles to the underflow, whereas large cone angles help reduce fine-particle misplacement and coarse-particle overflow and are more suitable for classification. Particle self-rotation is strongest for cone angles of 60 degrees- 110 degrees, providing favorable hydrodynamic conditions for sludge granulation, catalytic oil removal and non-phase-change sludge drying. Particle rotation alters particle trajectories and residence time, and hence the separation efficiency, underscoring the need to explicitly include rotational drag and lift in CFD simulations.