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Hoffmann, , A. March ; 56 2 : B28—B Springer-Verlag, Berlin. ISBN Cyclones, in this context, are devices for separating two phases in a fluid flow.
They appear in many other places, such as the catalytic cracking units that are at the heart of an oil refinery. Their design is not trivial. Nearly half the eighty-odd references are less than ten years old, and only eight are from or before—mainly classical papers or books cited out of piety rather than as recommended reading. The book is, clearly, intended for design engineers in industry, though college engineering departments could do worse than to make this book required reading as an introduction to real life.
The book begins with three chapters on basic ideas, including some of the mathematics of probability density functions for particle size. Then follow three chapters on modeling of the flow in a cyclone and its efficiency, and the inclusion of special effects such as wall roughness eg, collected solids , the influence of mass-loading, and the spatial variation of particle-size pdf within the body of the cyclone.
Here modeling means algebraic equations, based, of course, on the equations of motion for fluid and particles. The page Chapter 7 is a respite from cyclone modeling. It is called Computational Fluid Dynamics , but is actually an excellent introduction to turbulence modeling, numerical simulations, and methods of calculating particle-laden flows.
This reviewer fears it may be the cause of numerous violations of the Copyright Act by instructors seeking handouts. Current turbulence models are not very good at predicting swirling flows, so it will be some time before the simpler algebraic formulas of the first six chapters go out of use. Chapter 8 is also tutorial, covering dimensional analysis and scaling laws.
Most academic authors would have put it earlier, but although the formulas of the first six chapters have to be dimensionally correct, they do not for the most part contain dimensionless parameters. Chapter 9 on Other Factors Influencing Performance effect of solids loading and of the position near the narrow end where the vortex rolls up is followed by a chapter on measurement techniques - as Chapters 11—16 deal with practical and specialized matters, this is the right place to discuss testing techniques.
Incidentally, it was not until the advent of the laser Doppler anemometer that worthwhile measurements could be made within a cyclone, so a real understanding of the flow was only achieved fairly recently. Most chapters have worked examples not problems! Gas Cyclones and Swirl Tubes: Principles, Design and Operation should be invaluable to designers and even operators of cyclones, and cyclones are so ubiquitous that its influence will be felt in many branches of industry.
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Google Scholar. Author and Article Information. AC Hoffmann,, Author. Mar , 56 2 : BB Published Online: March 4, Article history Online:. Issue Section:. Volume 56, Issue 2. Previous Article Next Article. View Metrics. Accepted Manuscript Alert. New Issue Alert. Cited By Google Scholar.
These metrics are regularly updated to reflect usage leading up to the last few days. Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric. Find more information on the Altmetric Attention Score and how the score is calculated. The gas flow in and around once-through swirl tubes also called axial flow cyclones for gas demisting has been investigated by flow visualization using a neutrally boyant tracer and by computational fluid dynamics CFD.
Hoffmann, , A. March ; 56 2 : B28—B Springer-Verlag, Berlin. ISBN Cyclones, in this context, are devices for separating two phases in a fluid flow. They appear in many other places, such as the catalytic cracking units that are at the heart of an oil refinery.
Box , United Arab Emirates. A particle-laden flow inside solid gas cyclones has been studied using computational fluid dynamics CFD. The effects of high temperatures and different particle loadings have been investigated. The Reynolds stress RSM model-predicted results, in the case of pure gas, are within engineering accuracy even at high temperatures. Using the granular mixture model for the cases of particle-laden flow, discrepancies occurred at relatively high loadings up to 0.
Front Matter Pages I-XXVI PDF · Introduction Pages PDF · Basic Ideas Pages PDF · How Cyclones Work Pages PDF · Cyclone Flow Pattern.
The use of compact, inline separator has gain interest in the effort of reducing the size of topside facilities to reduce the capital cost associated with natural gas exploration.
Search this site. Hoffmann Synopsis: This book has been conceived to provide guidance on the theory and design of cyclone systems. Forthose new to the topic, a cyclone is, in its most basic form, a stationary mechanical device that utilizes centrifugal force to separate solid or liquid particles from a carrier gas. Gas enters near the top via a tangential or vaned inlet, which gives rise to an axially descending spiral of gas and a centrifugal force field that causes the incoming particles to concentrate along, and spiral down, the inner walls of the separator. The thus-segregated particulate phase is allowed to exit out an underflow pipe while the gas phase constricts, and - in most separators - reverses its axial direction of flow and exits out a separate overflow pipe. Cyclones are applied in both heavy and light industrial applications and may be designed as either classifiers or separators.
Embed Size px x x x x Alex C. HoffmannUniversity of BergenDept. Louis E. This work is subject to copyright. All rights are reserved, whether the whole or part of the materialis concerned, specically the rights of translation, reprinting, reuse of illustrations, recitation, broad-casting, reproduction on microlm or in any other way, and storage in data banks. Duplication ofthis publication or parts thereof is permitted only under the provisions of the German Copyright Lawof September 9, , in its current version, and permission for use must always be obtained fromSpringer.
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