Author: James Francis WelchPublisher:
ISBN:
Category :
Languages : en
Pages : 284
Book Description
Gas-fluidized Bed Vibration, an Experimental Study
Author: James Francis WelchAn Experimental Study of a Vertical Tube Gas-fluidized Bed
Author: Kevin Matthew MandichPublisher:
ISBN: 9781109703825
Category :
Languages : en
Pages : 212
Book Description
The goal of this experimental work was to investigate methods of measuring important fluidization properties in a vertical, cold-flow, gas-fluidized bed to gain an understanding of the fluidization characteristics of the bed materials used. Quantities such as pressure drop across the bed, mean bed height, and minimum fluidization velocity were determined using non-invasive methods and were compared to fundamental fluidized bed theories to verify proper performance of the experiment. Granular temperature near the wall, a quantity of great interest in this system, was also determined using a non-invasive technique. An Acoustic Shot Noise probe, developed by Cody et al. (1996), was used to correlate the vibrational energy at the fluidized bed wall to the average particle velocity normal to this surface. By determining the mechanical transfer function of the confining tube, it was possible to obtain an estimate for the granular temperature near the wall by performing a spectral analysis of the wall acceleration time signal. Experimentally-determined values of pressure drop, mean bed height, and minimum fluidization velocity agreed well with the values predicted from theory. Average granular temperature values also agreed well with those obtained through similar means (Cody et al., 1996). The mean bed expansion ratio and average granular temperature results were compared with those obtained from a Computational Fluid Dynamics simulation (Didwania et al., to appear). Good agreement was observed between experiment and simulation, and special attention was given to the effects of changing key parameters in the model.
Inelastic Gas
Author: Klebert Bezerra FeitosaPublisher:
ISBN:
Category : Gas dynamics
Languages : en
Pages : 294
Book Description
Experimental Studies on High-gravity Rotating Fluidized Beds
Author: G. C. LindauerPublisher:
ISBN:
Category : Fluidization
Languages : en
Pages : 44
Book Description
The Development and Impact of Instabilities in Gas Fluidized Beds
Author: Jayati JohriModeling and Flowsheet Simulation of Vibrated Fluidized Bed Dryers (Band 18)
Author: Sören Ernst LehmannPublisher: Cuvillier Verlag
ISBN: 3736975392
Category : Technology & Engineering
Languages : en
Pages : 182
Book Description
Fluidized bed dryers are the prime choice when it comes to drying of heat sensitive products, commonly processed in the pharmaceutical and food industry. As many products in these industries are fine and cohesive, mechanical vibration of the dryer is used to enable or improve fluidization. Thus, the goal of this thesis is the development of a fluidized bed drying model that accounts for the influence of mechanical vibration of the dryer, as well as its implementation in an open-source flowsheet simulation framework. Continuously operated fluidized bed dryers under steady-state conditions are the focus of this thesis. The aim during model development and implementation is the broadest possible application range of the model. A custom-built vibrated fluidized bed dryer is designed and constructed for comprehensive investigations of fluidized bed hydrodynamics and drying kinetics. Based on experimental investigations, a semi-empirical model for hydrodynamics of fine and cohesive powders is developed. The new model is combined with established models to allow for the flowsheet simulation of fluidized bed dryers for particles of all Geldart groups. Additionally, the influence of vibration is accounted for. Comprehensive validation experiments are performed for particles of different Geldart groups, different dryer geometries and a variety of process parameters, including mechanical vibration. Comparison of model predictions with experimental data attributes high accuracy of predicted particle and gas properties. Furthermore, sensitivity analyses are conducted to identify potential weaknesses in underlying model assumptions. Hereby, the validity of underlying assumptions is confirmed and potential optimization parameters for different applications are identified. The proposed model is unprecedented in terms of range of process parameters, variety of particle properties and dryer geometries, tested and found valid for.
An Experimental Study of Hydrodynamics Inside Fluidized Bed Bubbles
Author: Mridul GautamPublisher:
ISBN:
Category : Bubbles
Languages : en
Pages : 512
Book Description
Applied Mechanics Reviews
Author: Masters Theses in the Pure and Applied Sciences
Author: Wade H. ShaferPublisher: Springer Science & Business Media
ISBN: 1468426044
Category : Science
Languages : en
Pages : 300
Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by TPRC at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemina tion phases of the activity was transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we have concluded that it will be in the interest of all concerned if the printing and distribution of the volume were handled by a well-known publishing house to assure improved service and better communication. Hence, effective with this Volume 18, Masters Theses in the Pure and Applied Sciences will be disseminated on a worldwide basis by Plenum Publishing Corporation of New York. All back issues can also be ordered from Plenum. As we embark on this new partnership with Plenum, we also initiate a new venture in that this important annual reference work now covers Canadian universities as well as those in the United States. We are sure that this broader base will greatly enhance the value of these volumes.
Fluidised Particles
Author: J. F. DavidsonPublisher: Cambridge University Press
ISBN: 9780521047890
Category : Technology & Engineering
Languages : en
Pages : 172
Book Description
This book presents the theoretical background to the behaviour of fluidised beds in a form suitable for teachers and students of chemical engineering and for designers of process plant. It is important because it approaches the subject from first principles of fluid mechanics to problems of a truly chemical engineering nature. At all stages the theoretical treatment is directly related to experiment. Such a synthesis, much of which is based on recent research work by the authors and others, should also help to guide designers in the scaling-up of experimental work on small apparatus to pilot and production plant.