Universitetet i Bergen Institutt for fysikk og teknologi - forsiden
    Info for studenter
    Cyklon bog
    Bog: Stokastisk modellering i procesteknologi

Second, expanded edition published in 2007:

Gas Cyclones and Swirl Tubes
-Principles, Design and Operation
2nd Edition
A.C. Hoffmann and
L.E. Stein

Springer-Verlag, Berlin, Heidelberg, New York
ISBN 978-3-540-74694-2


Typeset in LaTeX
Drawings in Intaglio and Inkscape
Download flyer: Springer flyer; 33560 chapter downloads since made available as e-book by Springer in 2009 and one of the top 25% most downloaded eBooks in the relevant Springer eBook Collection in 2016.


More than 100 new pages in this edition contain:
(for description of the first edition, see below)

  • New section on the history of cyclones.
  • Updated and expanded chapter on CFD simulation of cyclones.
  • New material on: the need for "start-of-run" performance measurements, the purpose of "tracer" measurements, renewed emphasis on need to examine the "underflow" when problems arise, and expanded discussion and illustration of hopper venting options.
  • Expanded section on cyclone erosion with a new subsection on erosion of the outer wall of the vortex finder, in light of new CFD results.
  • A new section discussing enhancements to cyclones, including wetted wall cyclones, dust collection with sprays and electrostatically enhanced cyclones.
  • New sections on reentrainment and on wall film flow.
  • Improved introduction to foams.
  • Expanded section on vortex finder geometries with new subsections included.
  • Substantially expanded section on design of inlet vanes.
  • New material on the effect of rectifying vanes for pressure recovery and new material on the effect of vortex finder length on performance.
  • A new section on the design of cyclone rooves, with an appendix on the construction of a vane "cut-out pattern".
  • expanded discussion on problems associated with muticyclones.

Gas Cyclones and Swirl Tubes
-Principles, Design and Operation
A.C. Hoffmann and
L.E. Stein

Springer-Verlag, Berlin, Heidelberg, New York
ISBN 3-540-43326-0


Comprehensive Introduction to Gas Cyclone Technology

The subject of this book is centrifugal gas cleaning devices, namely cyclones used as gas-solid separators for de-dusting and as gas-liquid separators for de-misting. The optimization of cyclone performance for any given task is an often-sought goal but is seldom achieved in practice. Understanding cyclone performance as a function of cyclone size, geometry, feed properties, feed flow rates and the system of which it is a part, is essential if one wishes to successfully design, operate, troubleshoot or predict cyclone performance. The information presented in this book will help to develop this understanding.


More than 300 pages cover:

  • particle characterization, motion, size distribution, sampling
  • swirl flow and flow patterns
  • important cyclone separation and pressure drop models
  • static and dynamic pressure
  • computational fluid dynamics
  • vapour-liquid (demisting) and foam-breaking cyclones
  • swirl-tube type cyclones
  • wall roughness and solids loading effects
  • model predictions and comparison with experiments
  • dimensional analysis and scaling rules
  • sampling and performance measurement
  • in-leakage (up-flow) effects and hopper crossflow
  • dipleg ‘backup’
  • hopper venting
  • forces acting on a flapper valve
  • erosion and erosion protection methods
  • particle settling in conveying lines
  • high vacuum operation
  • estimating feed drop sizes distribution
  • non-uniform inlet flow distribution
  • inlet, overflow and underflow geometries and configurations including inlet vane design
  • cyclone length and the ‘natural’ vortex length
  • parallel and series arrangements and multiclones
Full table of contents

Brief list of errors in first print


About the Authors

Louis E. Stein graduated with a Ph.D. in Chemical Engineering from the Univer-sity of Houston in 1974. After graduating he worked as a post-doctoral research fellow at the University of Utah, as a NASA Engineering Aide, and as a process engineer at the Sinclair Refinery, Pasadena Texas. During the period 1970-74, he held the post of Chemical Engineering Instructor at the University of Houston. After an interval as Research Engineer at Envirotech, Salt Lake City, he joined Shell in 1975 and, after several promotions, and numerous company awards, retired in 1999 as a Senior Staff Process Engineer. He remains active as a Separations and Fluid Flow Consultant to industry and as Fluid Mechanics Lead Instructor for Shell.
Dr Stein has four patents to his name, he has held the Presidency of the South Texas Chapter of the International Filtration Society. He is married to Doris and has 3 children and 2 grandchildren.

Alex C. Hoffmann is of Danish nationality. He graduated with a Ph.D. from University College London in 1983 in high pressure fluidization. During his studies he worked one year for UOP oil products in Chicago. He worked for three years as a post-doctoral research fellow at Surrey University, stationed at Separation Processes Services at Harwell, acting as Research Engineer and Industrial Consultant in cyclone technology and gas cleaning. In 1987 he moved to the University of Groningen, as a Lecturer and, later, Senior Lecturer. In 2001 he started as Professor at the Programme for Process Technology at the Department of Physics at the University of Bergen.
Professor Hoffmann has carried out a number of research projects in collabora-tion with processing industry, mainly the oil and gas industry, specializing in particle and multiphase technology. He is the author of more than 70 scientific articles and has one patent to his name. He is married to Gloria and has two children.



The book was released in 2002, in Europe at the end of May and in the USA in July. It is available in all major bookstores carrying scientific/technical books.




Translation to Chinese
translated by
Dr Weiming Peng and
Prof. Zhongli Ji

Chemical Industry Press
ISBN 7-5025-5871-3


A complete translation to Chinese under license from Springer Verlag.











Til UiB
© 2006 Institutt for fysikk og teknologi - Universitetet i Bergen.
Adresse: Allégaten 55, 5007 Bergen
Tlf.: 55 58 28 06, Faks: 55 58 94 40, post@ift.uib.no