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Tuesday, August 11, 2020 | History

3 edition of Mixing of fluidized solids in small diameter columns found in the catalog.

Mixing of fluidized solids in small diameter columns

Roger Bart

Mixing of fluidized solids in small diameter columns

submitted in partial fulfillment of the requirements for the degreeof Doctor of Science in chemical engineering at the Massachusetts Institute of Technology

by Roger Bart

  • 330 Want to read
  • 15 Currently reading

Published in Cambridge, Mass .
Written in English


Edition Notes

Thesis (D.Sc.)-Massachusetts Institute of Technology. Microfilm of typescript. Cambridge, Mass.: Massachusetts Institute of Technology Libraries, 1950. 1 reel. 35mm.

ContributionsMassachusetts Institute of Technology.
The Physical Object
FormatMicrofilm
Pagination1 vol
ID Numbers
Open LibraryOL13650446M

@article{osti_, title = {DEVELOPMENT OF A CONTINUOUS COUNTER-CURRENT HIGH EFFICIENCY GAS-SOLIDS CONTACTOR}, author = {Levey, Jr, R P and de la Garza, A and Jacobs, S C and Heidt, H M and Trent, P E}, abstractNote = {Experimental conversions of UO/sub 3/ to UO /sub 2/ to UF/sub 4/ in batch fluidized bed pilot-scale contactor have demonstrated that conversion rates . l RUG01 L RUG01 m BOOK x BW 1 LA55 2 ALLW 3 9 6 A43 5 8 f 02 F LOAN/open shelves g Alternative formats All data below are available with an Open Data Commons Open Database by:

  Fluid mixing equipment are termed as liquid agitators. Solid mixing equipment are commonly referred to as mixers and blenders. While fluid mixing technology has been extensively studied and understood, solid mixing is more complex. The understanding of solid mixing, and the design of solid mixers continues to be art rather than a science. Mixing of powders is a common operation in any industry. Most powders are known to be cohesive, many agglomerate spontaneously when exposed to humid atmosphere or elevated storage temperature. Agitation of the powder (especially powders with different bulk densities) may result in migration of smaller particles downwards and of larger ones by:

  Advantages of packed column: packed columns are more suitablefor handling foaming system. for corrosive liquids, a packed column will usually be cheaper than the equivalentplatecolumn packing should alwaysbe considered for small diameter columns, say less than m, where plates would be difficult to install, and expensive. Low pressure drop. @article{osti_, title = {Heat transfer in three-phase fluidization and bubble-columns with high gas holdups}, author = {Kumar, S and Kusakabe, K and Fan, L S}, abstractNote = {Bubble column and three-phase fluidized bed reactors have wide applications in biotechnological and petroleum processes (Deckwer, ; Fan, ). In such biotechnological processes as fermentation and waste.


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Mixing of fluidized solids in small diameter columns by Roger Bart Download PDF EPUB FB2

SOLIDS MIXING TABLE Weight Sensing Devices and Sensitivity Device Sensitivity (one part in) Mixing of Solids, Particle Technology Series,Brian Scarlett (ed.), Kluwer in solids, if a small quantity of moisture or other fluid is Size: KB.

The rate of vertical solids mixing in the m diameter fluidized bed is enormous. The larger the diameter of fluidized beds, the more intensive the solids mixing in the beds. The reason is that solids mixing mainly depends upon bubble sizes, and bubbles are larger in a large fluidized by: 1.

Introduction Novel applications of upflow bubbling fluidized beds in solar receivers. The Upflow Bubbling Fluidized Bed (UBFB) has recently been promoted for its specific application of solar energy capture and storage (Zhang et al., a, Zhang et al.,Zhang et al., b, Perez-Lopez et al., ), with experiments carried out in short vertical tubes of small internal diameter Cited by: 9.

A new first degree solids mixing rate is proposed to evaluate the mixing of solids in small scale fluidized beds. Particle mixing experiments were carried out in a 2D fluidized bed with a cross. Gas and Solids Mixing in a Turbulent Fluidized Bed Article in AIChE Journal 48(9) - September with 59 Reads How we measure 'reads'.

Fluidized beds typically are more complex to design, build, and operate than other types of reactors, such as packed-bed and stirred-tank reactors.

Scaleup of fluidized beds can be difficult (1). Fluidized beds are prone to erosion and particle attrition caused by the moving particles. Solids. In industrial process engineering, mixing is a unit operation that involves manipulation of a heterogeneous physical system with the intent to make it more ar examples include pumping of the water in a swimming pool to homogenize the water temperature, and the stirring of pancake batter to eliminate lumps (deagglomeration).

Mixing is performed to allow heat and/or mass. CHARACTERIZATION OF HYDRODYNAMICS AND SOLIDS MIXING IN FLUIDIZED BEDS INVOLVING BIOMASS présentée par: FOTOVAT Farzam en vue de l’obtention du diplôme de: Philosophiae Doctor a été dûment acceptée par le jury d’examen constitué de: M.

LEGROS Robert, Ph.D., président M. CHAOUKI Jamal, Ph.D., membre et directeur de recherche. Fluidization (or fluidisation) is a process similar to liquefaction whereby a granular material is converted from a static solid-like state to a dynamic fluid-like process occurs when a fluid (liquid or gas) is passed up through the granular a gas flow is introduced through the bottom of a bed of solid particles, it will move upwards through the bed via the empty.

Mixing Rolls. Smooth metal rolls at variable speeds. For pastes & deformable solids to intense shear. 3 to 5 horizontal rolls in vertical stack. Material moves from slower to faster ones. Batch roll mills has two rolls set in horizontal plane and require long mixing time and attention.

Used for dispersing. solids in. rubber and plastic materials. Quantification of mixing-the mixing index concept 18 Mixing characteristics of binary mixture 20 Models developed previously for axial solids mixing A Quantitative Analysis of the Mixing of Three Solids Different in Density by an Air Fluidized Bed 2 IJCPE Vol.9 No.1 (March ) In fluidized beds, particles of different size and / or density are moving to reach other; equilibrium is set up between the competitive mechanisms of mixing and segregation.

This leads to aAuthor: Abbas H. Sulaymon, Rasha Habeb Salman. 12 Solid/solid mixing The mixing of solids is a critically important operation in many industries, especially in pharmaceutical production where the active ingredient in a formulation may be toxic and be present at only % by mass overall.

A product with too low an active ingredient will beFile Size: 1MB. A Study of Solids and Gas Mixing in a Partitioned Fluidized Bed Young-ju Seo Korea Institute of Energy Research, Daejon an average diameter of microns and particle density of g/cm3 were used.

can be seen in figure 2(a), the partitioned fluidized bed was very small. Increasing the. Mixing of Fluids Flowing Through Beds of Packed Solids While there have been numerous in- vestigations of radial mass and heat transport in packed beds (3, 7,12,15, go), axial mixing in the direction of flow has been neglected until recently because of experimental and analytical difficulties.

Lapidus and Amundson (11) presented. Bubbling and slugging were investigated in a m internal diameter bed of Geldart group A powders.

The slugging characteristics were assessed in terms of the operating parameters. Neither bed height nor particle properties affect the excess gas velocities at the onset of slugging, as predicted by the Stewart criterion.

Slugging characteristics (length and frequency) and fluidized bed Cited by: Solid Mixing. We define mixing as the reduction of inhomogeneity in order to achieve a desired degree of components (ingredients) combinations at a defined scale.

Failing to produce in the mixing scale-up the required product yield, quality, or physical attributes, would consequently increase the costs of manufacturing significantly, resulting in a marketing delay or even a product. Abstract.

In the literature, the values of lateral solids dispersion coefficient (D sr) in dense fluidized beds determined by different authors are scattered, ranging from to m 2 / present work is aimed to investigate the reasons for the divergence through CFD-DEM by: 6.

Segregation of particulate solids is examined in detail; for if we understand how things separate by particle property (size, density, etc.) and physical mechanisms then processes can be designed to create particle mixtures.

As for all mixing processes, it is important to understand the scale of. The mixing of liquids, solids and gases is one of the most common unit operations in the food industry. Mixing increases the homogeneity of a system by reducing non-uniformity or gradients in composition, properties or temperature.

Secondary objectives of mixing include control of rates of heat and mass transfer, reactions and structural changes.

Solid-Liquid Mixing. Solids are usually added to a liquid in a stirred tank at atmospheric pressure. In order to allow more accurate control of dissolved solid concentration, mixing of solids and liquids is often carried out as a batch operation (Towler and Sinnott, ).

Types of Reactors.Fixed and Fluidized Beds. Flow Through a Bed of Particles Broad residence time particles are high when distribution of solids due compared with other to intense solids mixing.

modes of contacting. No hot spot even with Erosion of internals. highly exothermic Uc decreases with increasing column diameter for small columns.Effective mixing of dry solids is an important considera-tion for many are several options available to companies that want to improve their dry mixing capabilities.

Companies often base their mixing purchases on product familiarity or cost rather than the attributes of different mixing machines. How do youFile Size: KB.