2 edition of Continuous thickening of non-ideal suspensions found in the catalog.
Continuous thickening of non-ideal suspensions
Richard I. Dick
|Statement||Richard I. Dick and Ali R. Javaheri.|
|Series||WRC research report ;, no. 45|
|Contributions||Javaheri, Ali Rasool, joint author.|
|LC Classifications||HD1694 .A136 no. 45, TP156.S45 .A136 no. 45|
|The Physical Object|
|Pagination||ix, 65 p. :|
|Number of Pages||65|
|LC Control Number||75622410|
These mixtures can exhibit very strong shear thickening behavior: under shear, the suspension can become a yield stress material sufficiently strong to support its own weight. Depending on the polymer concentration, we observe continuous or discontinuous shear thickening mechanisms; it is the discontinuous shear thickening that leads to the. Lin NY, et al. () Hydrodynamic and contact contributions to continuous shear thickening in colloidal suspensions. Phys Rev Lett (22) Brown E, Jaeger HM () The role of dilation and confining stresses in shear thickening of dense suspensions. J Rheol (NYNY) 56(4)–
These phenomena include solidification during rapid impact 2,3, as well as strong shear thickening characterized by discontinuous, orders-of-magnitude increases in suspension . Flocculated suspension 1. Introduction The settling of ﬂocculated suspensions is a subject that has attracted the attention of many authors. From the early works of Mishler () and Coe and Clevenger () to the recent book edited by Tory (), several research workers and engineers have contributed to a theory of thickening.
D. Suspensions of precipitate forming solids • Resinous materials when mixed with water become precipitated • Thickening agent is used • Example: Compound bentonite tincture, Tolune tincture 14 Formulation of suspension The three steps that can be taken to ensure formulation of an elegant pharmaceutical suspension are: 1. Suspensions. Suspensions possess certain advantages over other dosage forms. Some drugs are insoluble in all acceptable media and must, therefore, be administered as a tablet, capsule, or as a suspension. Because of their liquid character, suspensions represent an ideal dosage form for patients who have difficulty swallowing tablets or capsules.
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Description. The purpose of this study was to investigate the steady state continuous thickening of non-ideal suspensions such as sludges from water and wastewater treatment plants. Suspensions of high grade calcium carbonate, activated sludges, water softening sludges, and suspensions of fine glass beads were by: 6.
thickening of non-ideal suspensions such as sludges from water and waste- water treatment plants. Suspensions of high grade calcium carbonate, activated sludges, water softening sludges, and suspensions of fine glass beads were used.
The suspensions were thickened in a closed, continuous, pi lot, thickening system. Get this from a library. Continuous thickening of non-ideal suspensions: final report.
[Richard I Dick; Ali Rasool Javaheri]. The aim of this book is to present a rigorous phenomenological and mathematical formulation of sedimentation processes and to show how this theory can be applied to the design and control of continuous thickeners.
The book is directed to stu dents and researchers in applied mathematics and. A mathematical model for batch and continuous thickening of flocculated suspensions in vessels with varying cross-section. International Journal of Mineral Processing73 (), DOI: /S(03) P. Garrido, F. Concha, R.
by: continuous thickening experiments at P/DE = X 10"S g/g and nominal flux = kg/m^-s Calculated solids volume per unit area vs.
sediment height for diatomaceous earth suspensions Diatomaceous earth solids concentrations as a function of effective pressure calculated from continuous thickening data Comparison of continuous thickening data. thickening is not observed when density is too large, see for instance the large density data in Fig.
Books and reviews of course oﬀer an even broader range of possible behaviours [1–3,5,8,9], but the data in Figs. 1a,b are rep-resentative of the typical behaviour of dense suspensions. The primary purpose of this work is to show that a sim. thickening of non-ideal suspensions such as sludges from water and waste- water treatment plants.
Suspensions of high grade. for design and operation of steady state continuous thickeners. Suspensi ons of cal ci I J ~ carbonate.
concentrati on axis at Cu. Thickening Thickening Definition Continuous thickening by an operation called sedimentation is the separation of suspended solid particles from a liquid stream by gravity settling.
The primary purpose of thickening is to increase the solids concentration of the feed stream. MODEL FOR CONTINUOUS THtCKENERS An idealized flat-bottomed, steady-state thickener is chosen as our model.
In Fig. 1, the various regions are listed as overflow, feed-transition, thickening and discharge. The increasing volume fraction of solids from e5, to e5, is shown. Barnes, H. Shear-thickening (dilatancy) in suspensions of nonaggregating solid particles dispersed in Newtonian liquids J Rheol 33 Reynolds, O.
On the dilatancy of media composed of rigid particles in contact, with experimental illustrations Phil Mag Ser 5 20 and continuous experiments. For the batch tests, the sedimentation vessel used was m high and for the semi-eontinuousand continuous tests the vessel was extended to m so that feed could enter at a depth of m, allowing the formation ofa clarification zone and a reasonable bed depth.
The vessel had an internal diameter of 95mm. On the. Experimental determination of thickening parameters and instruments for their determination are presented. Old and new methods for thickening design are reviewed and software for the design and simulation of batch and continuous thickening are presented.
Finally, strategies for the operation and control of industrial thickening are discussed. Two types of shear thickening are observed: monotonous or a continuous increase in the viscosity (CST) and discontinuous or an abrupt jump of the viscosity in a very short range of stresses (DST.
The rheology of dense suspensions is of considerable theoretical and technological importance, yet the shear rheology of even the simplest case of a suspension of hard spheres in a Newtonian suspending fluid is incompletely understood ().Many of the features observed in these suspensions, including shear thinning or thickening (3, 4) and the magnitudes and even the.
These suspensions undergo increasingly strong continuous shear thickening (CST) as the solid volume fraction ϕ increases above a critical volume fraction, and discontinuous shear thickening (DST) is observed in a range of ϕ.
When studied at controlled stress, the DST behavior is associated with nonmonotonic flow curves of the steady-state. When applying batch-settling results to continuous thickening, it is implicitly assumed that the thickener wili exhibit ideal thickener properties.
Shannon and Tory () have defined an ideal thickener as one in which there is no radial variation in either the solids concentration or in the downward component of suspension velocity.
The role of ore properties (density, particle size, and mineralogy) in thickening process was studied in this research. The shaking table was used to prepare the sample for the tests. Colloidal suspensions are encountered in a multitude of natural, biological and industrially relevant products and processes.
Understanding what affects the flow behavior, or rheology, of colloid particles, and how these suspensions can be manipulated, is important for successful formulation of products such as paint, polymers, foods and pharmaceuticals. Sludges resulting from water and wastewater treatment processes consist of agglomerated individual particles producing aggregates of various sizes and densities.
Particle size, particle density, aggregate size and aggregate density are characteristics which determine the amenability of a suspension to continuous gravity thickening. To investigate the effects of these suspension characteristics. Solutions, suspensions, colloids, and other dispersions are similar but have characteristics that set each one apart from the others.
Solutions A solution is a homogeneous mixture of two or more components. This chapter studies sedimentation of suspensions treated as continuous media. Sedimentation processes are studied from two perspectives; a discrete approach and a continuum approach, in which dynamic processes are established.
This chapter uses the continuum approach and presents the concept of an ideal suspension and an ideal thickener. A weak continuous shear thickening seen in near hard-sphere dispersions at solid fractions up to about ϕ =e.g., by D’Haene et al.
[25 D’Haene, P., J. Mewis, and G. G. Fuller, “ Scattering dichroism measurements of flow-induced structure of a shear thickening suspension,” J. Colloid Interface Sci.– ().