Download or read book Theoretical and experimental studies of gas and particle motion around bubbles in a two dimensional fluidised bed written by Alain Louis Francois Martin-Gautier and published by . This book was released on 1974 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth of Single NO2 Gas Bubbles in a Two dimensional Air Fluidized Bed written by Ross Dale Rieke and published by . This book was released on 1969 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report written by United States. National Bureau of Standards and published by . This book was released on 1959 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Theses and Dissertations Accepted for Higher Degrees written by University of London and published by . This book was released on 1970 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NBS Special Publication written by and published by . This book was released on 1959 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Research in the United States written by and published by . This book was released on 1958 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gas Flow in Fluidized Beds of Large Particles written by Goran N. Jovanovic and published by . This book was released on 1979 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas mixing is studied in fluidized beds of large particles. The bed is 0. 483 m by 0. 127 m (19 in. by 5 in.) in cross section and has transparent plexiglass panels on the front and back. A tube matrix made of twenty-seven 50.8 mm (2 in.) diameter plexiglass cylinders fixed in an equitriangular pitch (with the pitch to diameter ratio equal to 2) is used to study the effects of tubes. Experiments are done in a bed with and without tube array. Sand and dolomite particles with mean particle diameter of 1.3 mm (0. 051 in.) to 4.0 mm (0. 157 in.) are used. Gas velocities are varied from minimum fluidization velocity to an excess velocity of 2.5 m/s. Two large particle fluidization regimes are described. The experimental evidence is presented in support of the existence of slow bubble and exploding bubble regimes. A semi-theoretical equation establishing the boundary between these two modes of fluidization is derived. A slow bubble regime is encountered in the bed in which the interstitital velocity of the gas exceeds the rising velocity of bubbles. Here the gas uses the bubble as a convenient shortcut on its way through the bed. The exploding bubble regime is reached at higher superficial gas velocities when the bubble growth rate is of the same magnitude as the bubble rise velocity. Large pressure drop oscillations, gross gas bypassing, defluidization of some of the particles and rapid bubble growth are characteristics of the exploding bubble regime. A new criterion is suggested for distinguishing between the fast and the slow bubble regimes. The criterion is derived as a relationship between two non-dimensional groups. The expansion of the bed of large particles with and without tube array is also studied. Theoretical equations are proposed for correlating relative bed voidage versus relative excess gas velocity. They are based on the two-phase theory and all are developed as a special case of one general equation. The equation derived for the slow bubble regime fits the experimental data of this study better than other existing correlations. The equation developed for the fast bubble regime compares favorably with literature data for fine particles. A special case of the general equation can be developed for stationary bubbles and for the slugging regime. It is found that there is little difference in expansion of beds with and without a tube array at low excess gas velocities. However, for higher excess gas velocities expansion is considerably greater for beds with a tube array. Exploding bubbles in a bed without tubes are responsible for this difference. The dispersion of tracer gas injected continuously through a line source above the distributor plate is determined for time-averaged concentration measurements. The tracer concentration at points within the bed is successfully predicted using a single-phase model with interstitial gas velocity (based on average bed voidage) as a characteristic fluidization velocity. The model is insensitive to axial dispersion and depends only on radial dispersion coefficients. The radial dispersion coefficient does not depend on either horizontal or vertical position in the bed and is a strong function of excess gas velocity. Considerable difference is found in tracer dispersion in beds with and without tube array. A new model, called the meandering flow model, is proposed for gas flow through fluidized beds of large particles. The concept of meandering flow is developed on the basis of actual physical movement of gas. The series of peaks observed in tracer concentration data records are explained by a bulk lateral movement of gas induced by large bubbles. A simple mathematical technique is suggested for the analysis of tracer data. As a result of the application of the meandering flow model the turbulent and meandering dispersion coefficients are defined. Meandering of fluid through the bed does not contribute to gas mixing, and consequently the meandering dispersion coefficient has to be subtracted from the overall radial dispersion coefficient. Only the turbulent dispersion should be used in the evaluation of the extent of gas mixing in fluidized beds of large particles, which contributes to gas phase combustion.

Download or read book Advances in Engineering Fluid Mechanics Multiphase Reactor and Polymerization System Hydr written by Nicholas P Cheremisinoff and published by Elsevier. This book was released on 1996-08-27 with total page 785 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of the Advances in Engineering Fluid Mechanics Series covers topics in hydrodynamics related to polymerization of elastomers and plastics. Emphasis is given to advanced concepts in multiphase reactor systems often used in the manufacturing of products. This volume is comprised of 30 chapters that address key subject areas such as multiphase mixing concepts, multicomponet reactors and the hydrodynamics associated with their operations, and slurry flow behavior associated with non-Newtonian flows.

Download or read book Current Hydraulic Laboratory Research in the United States written by and published by . This book was released on 1959 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book BLLD Announcement Bulletin written by British Library. Lending Division and published by . This book was released on 1975 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Research in the United States 1959 written by United States. National Bureau of Standards and published by . This book was released on 1959 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1972 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coupled CFD DEM Modeling written by Hamid Reza Norouzi and published by John Wiley & Sons. This book was released on 2016-10-17 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the CFD-DEM method of modeling which combines both the Discrete Element Method and Computational Fluid Dynamics to simulate fluid-particle interactions. Deals with both theoretical and practical concepts of CFD-DEM, its numerical implementation accompanied by a hands-on numerical code in FORTRAN Gives examples of industrial applications

Download or read book Miscellaneous Publication National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1934 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1964 with total page 1326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multiphase Flow And Heat Transfer written by Xuejun Chen and published by CRC Press. This book was released on 1990-11-01 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt: These essays present the latest international research results in the field of multiphase flow and heat transfer. They are based on papers presented at the "Second International Symposium on Multiphase Flow and Heat Transfer" conducted in China in 1989.