Design rules for suspending concentrated mixtures of solids in stirred tanks

Date

2011-10-01

Author

Ayrancı Tansık, İnci

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

194
views

0
downloads

This study examines complete off-bottom suspension conditions for slurries containing mixtures of solids at a wide range of concentrations. Binary combinations of five different particles; bronze, two sizes of glass beads, ion exchange resin, and nickel were tested with two impellers: the Lightnin A310 and the down pumping 45 degrees PBT. The effect of particle size ratio and density ratio of the two solid phases on N(js) was investigated. Solids loadings were varied from 3 to 56 wt% (weight percent) with water as the liquid phase. The results showed that the highest particle N(js), in a mixture of solids is not a sufficient design specification to ensure suspension of the mixture. For one of the cases studied, the particle-particle interactions became significant at high loadings and resulted in a decrease in N(js). Different behaviours were observed for the other mixtures. The performance of the two impellers was also compared. The A310 impeller consumes significantly less power at N(js) than the PBT. Both impellers showed an effect of off-bottom clearance on N(js), but the effect of off-bottom clearance depended on both the solids concentration and on the solids used. (C) 2011 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Subject Keywords

Just suspended speed, Stirred tank, Solid-liquid mixing, Mixture, High solids loading, Off-bottom impeller clearance

URI

https://hdl.handle.net/11511/39881

Journal

CHEMICAL ENGINEERING RESEARCH & DESIGN

DOI

https://doi.org/10.1016/j.cherd.2011.01.008

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Steady-state parallel plate apparatus for measurement of diffusion coefficient in supercritical carbon dioxide Tuan, DQ; Yener, Meryem Esra; Zollweg, JA; Harriott, P; Rizvi, SSH (1999-02-01) A new, steady-state experimental system for measurement of the Fickian diffusion coefficients for solutes in supercritical carbon dioxide (SC-CO2) was designed and evaluated. Mass transfer between a Liquid solute and SC-CO2 was carried out in a parallel plate geometry where a porous metal sheet, immersed in the liquid phase, stabilized the interface. The SC-CO2 flowed over the porous metal sheet containing the liquid phase which was presaturated with CO2. The use of the porous metal sheet and a thin mobile ...
Investigation of biologically important small molecules: quantum chemical and molecular dynamics calculations Tekin, Emine Deniz; Erkoç, Şakir; Department of Physics (2010) In this thesis, six small molecules (S-allylcysteine, S-allyl mercaptocysteine, allicin, methyl propyl disulfide, allyl methyl sulfide and dipropylsulfide) that are found in garlic and onion, and are known to be beneficial for human health were studied using molecular mechanics, semi-empirical methods, ab-initio (Restricted Hartree Fock), and density functional theory. Using the same methods, a synthetic pyrethroid pesticide molecule, called cyfluthrin, was also studied. Structural, vibrational and electron...
Phase equilibrium of asymmetric systems by predictive equations of state models Orbey, H; Balci, C; Guruz, GA (2002-03-06) In this study the modified Wong-Sandler (WS), the modified Huron-Vidal second-order (MHV2), and the Orbey-Sandler (HVOS) mixing rules were used for phase equilibrium correlation of carbon dioxide in n-alkanes, alcohols and water systems. Their correlative and predictive capabilities were compared. In all of these calculations, the Peng-Robinson-Stryjek-Vera (PRSV) equation of state (EOS) was used. It was found that the correlation capacity of the WS mixing rule is better than the HVOS mixing rule. The MHV2 ...
Experimental investigation of nanofluids using terahertz time domain spectroscopy (THz TDS) Koral, Can; Okutucu Özyurt, Hanife Tuba; Altan, Hakan; Department of Micro and Nanotechnology (2012) In this study, suspensions of metallic nanoparticles in base fluids, nanofluids, are investigated by using terahertz time domain spectroscopy (THz-TDS). Nanofluids are used as the working fluid in a variety of applications especially for the purpose of heat transfer enhancement. Polar fluids are being used as the base in nanofluids for their tendency to stop aggregation and sedimentation. Polar fluids highly absorb THz signal. In order to select the best possible host, various polar liquids have been invest...
Electrochemical synthesis of new conjugated polymers based on carbazole and furan units Oguzturk, H. Esra; TİRKEŞ, SEHA; Önal, Ahmet Muhtar (2015-08-01) In this study, synthesis of four new monomers; 3,6-di(2-furyl)-9H-carbazole (M1), 3,6-di(2-furyl)-9-ethyl-carbazole (M2), 2,7-di(2-furyl)-9-H-carbazole (M3), 2,7-di(2-furyl)-9-(tridecan-7-yl)-9H-carbazole (M4), was achieved via Stifle cross-coupling reaction. The monomers were electrochemically polymerized, via repetitive cycling in acetonitrile-tetrabutylammonium hexafluorophosphate electrolytic medium. Optical and electrochemical properties of the monomers and their corresponding polymers were investigate...

Citation Formats

İ. Ayrancı Tansık, “Design rules for suspending concentrated mixtures of solids in stirred tanks,” CHEMICAL ENGINEERING RESEARCH & DESIGN, pp. 1961–1971, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39881.