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Mass Transfer by J.A. Wesselingh and R. Krishna. Ellis Horwood Ltd UK (1990). 243 pp

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Dust and Fume Control: A User Guide, revised 2nd edition. Institution of
Chemical Engineers, UK (1992). 157 pp. ISBN 0-85295-287-2.
My first question upon picking up this book is why the author’s (or editor’s) name
is missing from the front cover? True the first edition in 1981 was produced from
the findings of a committee, but the 1985 and current edition seem to be the
product mainly of Dr Muir’s efforts! A minor point and not one that should
distract us from the actual book itself. The second edition has now been revised
to cover the recent relevant UK legislation such as COSHH, Noise at Work
(1989), and the 1990 Environmental Protection Act. At f 19.50 it represents quite
a bargain. As the title indicates, it is a User Guide and not a definitive handbook
on the subject. However, it provides a useful assessment of all the important areas
for workers concerned with dust (and fume) explosions and emissions.
The book includes chapters on health and safety requirements, containment
and capture, the main types of equipment available for particular situations and
tasks, instrumentation and control, and handling and disposal of dust and slurries.
In summary, it provides information for the selection, instrumentation and
operation of gas-cleaning equipment for dust and fumes. The book is presented in
a well thought-out and logical manner.
Chapters 2 to 7 cover the feasibility/evaluation stage of the problem. Chapter 7
considers the initial technical choice between the five main types of dust
collectors, followed by Chapters 8 to 12 dealing with aspects of each type of
collector. The remaining chapters deal with operational aspects, e.g.
instrumentation and control, economics, efc. Useful references are included, but
except for the health and safety aspects all the references are from the 1970s! It
would almost appear as if nothing new or important was published in the 1980s!
The editor should include a more detailed and up to date bibliography in any
reprint. This book is a very good place to get an overview of this subject before
studying some of the more advanced and comprehensive handbooks available.
Martyn S Ray
Mass Transfer, by J.A. Wesselingh and R. Krishna. Ellis Horwood Ltd, UK
(1990). 243 pp. ISBN 0-13-553165-9.
The text is based on multicompontent mixtures and the use of driving forces other
than those caused by concentration differences, i. e. the use of Maxwell-Stefan
equations rather than a Fickian diffusion model. Chapter 2 poses some very
interesting ‘thinking/starting’ points for the reader! The text considers mass
transfer theory from the point of view of our understanding of the concepts, and
some particular applications. It poses questions and raises some interesting
anomalies. Out of 243 pages there are 76 pages of worked examples covering the
material in most chapters, and there is a useful bibliography. These two aspects
alone would usually compel a casual reader to delve a little further and probably
make some use of the book! This book should be essential reading for all
undergraduates prior to their final year of study, it might show them that there are
more ideas and cases to be considered than those posed in a short series of lectures
using traditional textbooks! This book would also make an excellent
complimentary text to Bird et nl. (which despite its age is still widely used) for a
course in Transport Phenomena. However, it would not be useful or suitable for
course units dealing with the traditional unit operations.
I believe students should be told to read it and think about the ideas during the
vacation. Then present a short paper or a class talk on the concepts raised i n the
book at the start of the final undergraduate year. However, most students would
hate this approach! Why? Because it requires them to think outside the
‘guidelines’ of a traditional textbook (e.g. Coulson and Richardson) and beyond
the standard tutorial-type problems. It asks the reader to do what they should be
required to do more often - namely, to tackle unfamiliar problems and situations.
Perhaps some lecturers might like to consider this option?
Martyn S Ray
Process Plant Design and Operation, by D. Scott and F. Crawley. Institution of
Chemical Engineers, UK (1992). 141 pp. ISBN 0-85295-278-3.
This book is another new publication from the IChemE in their excellent series of
User Guides, replacing Flowsheeting for Safety. The series is well known for the
practical content and useful advice and this book maintains that tradition. It covers
many aspects of importance to graduate engineers and is written by two
practitioners working in the field of loss prevention and safety. The Forward states
that it was intended to provide general advice on safety and loss prevention to
young graduate engineers. The book does this very well, but it will also be useful
to final year undergraduates and should be essential reading as part of a plant
desigdsafety unit. It will provide a good supplement to the writings of Trevor
Kletz! The basic message of this book is that “safetyshould be considered at the
design stage of every project, this makes plant development cheaper and safer“. I
would hope that this is emphasised many times to our undergraduates. Although
safety and loss prevention are probably mainly confined to a particular section of
the syllabus, I hope that their importance is stressed during all laboratory and
design studies. In most chapters safety is considered during the four major phases
of a project, namely conceptual design, detailed design, start-up, and operation.
This makes the layout and scope of the book easy to follow, but it also runs the
risk of letting the reader think that safety can be pigeon holed! The authors warn
in the Appendix when considering the presentation of checklists that “there is a
danger that slavish adherence will follow ...“
These points aside, the book is clearly written, well presented, easy to follow,
and has a lack of typographical errors. It covers the topics in a logical and
interesting manner and provides much practical advice for the reader relatively
new to the subject. So why did I feel dissatisfied while reading the book and what
was missing? The contents and presentation made good sense, and it didn’t make
any claims to be a comprehensive reference source on the subject. Finally I
decided that the problem was a lack of case study material illustrating the use of
some of the principles presented. It came over as too many facts and ideas without
the applications! The book would make a good basis for a lecture course where
the lecturer added case studies and assignments to illuminate and use the text
material. However, for the solitary reader it was certainly interesting but lacked a
vital ingredient, and at 141 pages, there is space to add some extra material!
HAZOP studies in particular (in Chapter 6) really need a practical example to
illustrate the ideas proposed. These comments should not detract from the overall
usefulness of this book. It is a valuable addition to the literature but it is more
suited to undergraduates than young graduate engineers. The book should provide
an interesting read and valuable pointers to graduates. But I hope the next edition
includes some examples of applications of the principles, or maybe even
structuring the text around a major case study.
Martyn S Ray
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horwood, mass, 243, 1990, krishna, transfer, ellis, ltd, wesseling
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