Author: Jacob Christian Fritz
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 402

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Author: O. Molerus
Publisher: Springer Science & Business Media
ISBN: 9401158428
Category : Technology & Engineering
Languages : en
Pages : 205

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Book Description
This book provides a much needed and thorough treatment of the heat transfer in agitated disperse systems. It gives predictive equations for the heat transfer in moving beds, bubbling and circulating fluidized beds, pneumatic transport in vertical tubes and particulate fluidized beds. Owing to the many different modes of activation of heat transfer, the basic approach of the book is to provide experimental evidence of the relevance of particle motion to the proximity of solid surfaces for the heat transfer observed. This has been achieved by the evaluation of experiments obtained with a newly developed pulsed light method using luminous particles. Heat Transfer in Fluidized Beds will be of great use to students and researchers involved in heat transfer and thermodynamics.

Author: Lorenza C. L. Feng
Publisher:
ISBN:
Category : Fluidization
Languages : en
Pages : 390

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Book Description

Author: J. S. M. Botterill
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 314

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Author:
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 1478

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Author: D. Kunii
Publisher: Elsevier
ISBN: 008050664X
Category : Science
Languages : en
Pages : 520

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Book Description
Fluidization Engineering, Second Edition, expands on its original scope to encompass these new areas and introduces reactor models specifically for these contacting regimes. Completely revised and updated, it is essentially a new book. Its aim is to distill from the thousands of studies those particular developments that are pertinent for the engineer concerned with predictive methods, for the designer, and for the user and potential user of fluidized beds. - Covers the recent advances in the field of fluidization. - Presents the studies of developments necessary to the engineers, designers, and users of fluidized beds.

Author: Alphonse Roman Noë
Publisher:
ISBN:
Category : Fluidization
Languages : en
Pages : 176

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Book Description
Local and average heat transfer coefficients for heat transfer from internal tubes to a fluidized bed were investigated. A fluidized bed heat exchanger was compared to a baffled and an unbaffled exchanger in terms of power and heat transfer surface area requirements. The fluidized bed heat exchanger consisted of a 44 inch long, 5.75 inch inside diameter shell with 19, 3/4 inch diameter tubes arranged in a 1-1/16 inch triangular pitch. Fluidized solids were two narrow sized groups of Scotchlite glass beads having .0057 inch and .0188 inch average diameters. The fluidizing medium was air and there was no tube side fluid. Variables studied included particle size and concentration, superficial gas velocity, and different locations of the heat transfer surface. The local heat transfer coefficients were measured by means of a movable temperature probe in contact with the inner wall of a thin-walled tube through which a constant heat flux was maintained. Values of local coefficients ranging from 2 to 101 Btu/hr. ft2.°F and average coefficients ranging from 6 to 35 Btu/hr.ft2.°F were obtained. This represents a maximum increase of 50-fold for the local coefficients and 25-fold for the average coefficients over those for air alone. The fluidized bed consisted of areas of dense and sparse solids concentration. In the dense section of the bed, the local coefficients were essentially constant and higher values of the coefficients were obtained at lower flow rates. The opposite was true in the sparse section of the bed and variation of heat transfer coefficient with flow rate was similar to that for single phase fluids. Heat transfer surface location did not affect the average coefficients appreciably, however the local coefficients were affected slightly, the center tube having somewhat lower coefficients. The average heat transfer coefficients were found to increase as a power function of the solids concentration. The ratio of the heat transfer capacity of the fluidized bed exchanger to that of the unbaffled and baffled exchangers was considerably greater than unity, indicating its advantage as far as space requirements are concerned. An overall advantage of reduced heat requirement for the fluidized bed exchanger was found in the region of static bed heights transfer area and power over the baffled exchanger below five inches.

Author: Sergeĭ Stepanovich Zabrodskiĭ
Publisher:
ISBN:
Category : Fluidization
Languages : en
Pages : 426

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Author: James Michael Modlin
Publisher:
ISBN:
Category :
Languages : en
Pages : 362

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Book Description
The lack of reliable data on the fluidization and heat transfer characteristics of low density particles in a fluidized bed has prompted an experimental and analytical investigation into this subject. Seven groups of particles ranging in diameter from 0.25 mm to 2.0 mm and density from 2.5 to 32 pcf have been successfully fluidized and shown to be generally well predicted by classical fluidization and fluidized bed heat transfer theory. Two other groups of particles, also in this approximate range of particle diameter and density, are, however, unable to be fluidized due to significant inter-particle and static electric attractions. Using the experimental data and results as a basis of analysis, two application of low density particle fluidization in a building efficient energy management program are discussed. A fluidized bed can be incorporated into the wall cavity of a building for use as either a collector of solar energy or as a heat exchange medium in a building space heating/cooling program. As a solar collector, it is shown that the low density particle fluidized bed would thermally perform between comparable conventional liquid and air-cooled flat plate solar collectors. It would require less water pumping power and plumbing than the liquid collector and less air pumping power than the air collector. Keywords: Heat exchangers; solar collector. (Theses).

Author: R. D. Patel
Publisher:
ISBN:
Category : Fluidization
Languages : en
Pages : 112

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