Computational analysis and optimization of hydrocyclone size to mitigate adverse effect of particle density

Ji, Li; Kuang, Shibo; Zheng, Qiujian; Wang, Yuan; Jiang, Chen; Yu, Aibing

doi:10.1016/j.seppur.2016.10.034

Cited by 63 publications

(50 citation statements)

References 45 publications

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“…After reaching the maximum value, it gradually shrinks with the decrease in the radius. This is, in essence, consistent with the conclusion of the research by Ji et al [39]. The diameter of the underflow outlet has little effect on the radial velocity field, which demonstrates that there is no essential difference between the double-overflow-pipe structure and the traditional single-overflow-pipe structure in terms of the radial velocity distribution.…”

Section: Distribution Characteristics Of Velocity Field and Influencesupporting

confidence: 89%

Numerical Simulation of Flow Field Characteristics and Separation Performance Test of Multi-Product Hydrocyclone

et al. 2019

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A traditional hydrocyclone can only generate two products with different size fractions after one classification, which does not meet the fine classification requirements for narrow size fractions. In order to achieve the fine classification, a multi-product hydrocyclone with double-overflow-pipe structure was designed in this study. In this work, numerical simulation and experimental test methods were used to study the internal flow field characteristics and distribution characteristics of the product size fraction. The simulation results showed that in contrast with the traditional single overflow pipe, there were two turns in the internal axial velocity direction of the hydrocyclone with the double-overflow-pipe structure. Meanwhile, the influence rule of the diameter of the underflow outlet on the flow field characteristics was obtained through numerical simulation. From the test, five products with different size fractions were obtained after one classification and the influence rule of the diameter of the underflow outlet on the size fraction distribution of multi-products was also obtained. This work provides a feasible research idea for obtaining the fine classification of multiple products.

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Section: Distribution Characteristics Of Velocity Field and Influencesupporting

confidence: 89%

Numerical Simulation of Flow Field Characteristics and Separation Performance Test of Multi-Product Hydrocyclone

et al. 2019

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“…Particles with sizes smaller than the cut size fall into the overflow, and particles with sizes larger than the cut size fall into the underflow. However, the "entrainment of coarse particles in the overflow" and the "entrainment of fine particles in the underflow" are two inevitable phenomena that occur because of the complexity of the hydrocyclone's internal flow field, and these phenomena can result in a wide product size distribution that does not meet the requirement of precise classification [9][10][11][12]. Connecting multiple hydrocyclones in series is one way to solve the problem of wide product size distribution and obtain a series of products with narrow size distributions.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

Jiang¹,

Liu²,

Zhang³

et al. 2019

Minerals

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The “entrainment of coarse particles in overflow” and the “entrainment of fine particlesin underflow” are two inevitable phenomena in the hydrocyclone separation process, which canresult in a wide product size distribution that does not meet the requirement of a preciseclassification. Hence, this study proposed a two-stage (TS) hydrocyclone, and the effects of the inletvelocity on the TS hydrocyclone were investigated using computational fluid dynamics (CFD).More specifically, the influences of the first-stage inlet velocity on the second-stage swirling flowfield and the separation performance were studied. In addition, the particle size distribution of theproduct was analyzed. It was found that the first-stage overflow contained few coarse particlesabove 40 μm and that the second-stage underflow contained few fine particles. The second-stageunderflow was free of particles smaller than 10 μm and almost free of particles smaller than 20 μm.The underflow product contained few fine particles. Moreover, the median particle size of thesecond-stage overflow product was similar to that of the feed. Inspired by this observation, wepropose to recycle the second-stage overflow to the feed for re-classification and to use only thefirst-stage overflow and the second-stage underflow as products. In this way, fine particle productsfree of coarse particle entrainment, and coarse particle products free of fine particle entrainmentcan be obtained, achieving the goal of precise classification.

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“…Essas diferenças podem ser atribuídas ao método de medida de volume das amostras, em que os espaços vazios entre as partículas reduzem em partículas mais finas, aumentando a densidade do material. Ji et al (2017) verificaram que partículas da indústria do carvão que apresentam densidade na faixa de 1275 e 2200 kg m -3 são facilmente separadas em hidrociclones, notando que nessas condições se pode operar com maior velocidade de fluxo de arraste de separação das partículas, visto que elas apresentam maiores velocidade terminais de decantação em fluxo de água.…”

Section: Resultsunclassified

Densidade aparente dos resíduos da polpa de maracujá

Matias

Regis

Talma

et al. 2018

Braz. J. Food Technol.

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Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que o trabalho original seja corretamente citado. Densidade aparente dos resíduos da polpa de maracujáApparent density of passion fruit pulp residue ResumoO objetivo do trabalho foi avaliar a densidade aparente dos componentes do resíduo da polpa de maracujá (arilo e sementes), tendo em vista um processo de separação física desses componentes. O resíduo foi suspenso em água e agitado a 1000 rpm por 60 min para separar os componentes, sendo secos em papel-toalha para realizar as medidas de densidade aparente pelo método do balão volumétrico, utilizando álcool etílico (96 °GL) para as sementes decantadas, e hexano para os materiais suspensos em água, com 10 repetições. A densidade aparente de sementes decantadas foi de 1160 kg m -3 ; o arilo apresentou 912 kg m -3 . As sementes suspensas de Padrão 1 (sementes imaturas finas e brancas) mediram 950 kg m -3 ; Padrão 2 (sementes claras e/ou com início de pigmentação escura) apresentaram 897 kg m -3 ; Padrão 3 (escuras) mediram 851 kg m -3 . Concluiu-se que a densidade aparente das sementes decantadas é maior do que a densidade da água, possibilitando o uso do processo de separação por decantação das sementes puras e o arraste do material suspenso, de densidade inferior à densidade da água. O processo de separação do arilo por meio da remoção de sementes em suspensão não pode ser realizado em meio aquoso. Palavras-chave: Passiflora edulis Sims; Processamento de resíduos; Sementes; Arilo. AbstractThe objective of this work was to evaluate the apparent density of the pulp residue components (aryl and seeds) aiming to develop a physical separation process for these components. The residue was suspended in water and stirred at 1000 rpm for 60 min to separate the components, which were then dried on paper towelling before carrying out the apparent density measurements using the volumetric balloon method with ethyl alcohol (96 °GL) for the decanted seeds, and hexane for the material suspended in the water, with 10 replicates. The apparent density of the decanted seeds was 1160 kg m -3 and that of the aryl 912 kg m -3 . The suspended seeds of Standard 1 (immature, fine, white seeds) measured 950 kg m -3 ; of Standard 2 (white and/or with the start of dark pigmentation) presented 897 kg m -3 ; and Standard 3 (dark seeds) measured 851 kg m -3 . It was concluded that the apparent density of the decanted seeds was higher than that of the water, making it possible to develop a physical process to separate pure decanted seeds and drag out the suspended material, which has a density lower than that of water. The process of separating the suspended seeds from the aryls cannot be carried out in an aqueous medium.

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Computational analysis and optimization of hydrocyclone size to mitigate adverse effect of particle density

Cited by 63 publications

References 45 publications

Numerical Simulation of Flow Field Characteristics and Separation Performance Test of Multi-Product Hydrocyclone

Numerical Simulation of Flow Field Characteristics and Separation Performance Test of Multi-Product Hydrocyclone

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

Densidade aparente dos resíduos da polpa de maracujá

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