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Two-Phase Flow and Heat Transfer Chemical Engineering Primer Series by P.B. Whalley Oxford University Press UK (1996). 92 pages

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Book Reviews
Two-Phase Flow and Heat Transfer, Chemical Engineering Primer
Series, by P.B. Whalley, Oxford University Press, UK (1996). 92
pages. ISBN 0-19-856444-9.
This book is a shortened version of an earlier book by the same author (Boiling,
Condensation and Gas-Liquid Flow, 1987; now out of print). As the series title
implies , this book is intended as a primer for chemical and mechanical engineering
students in need of basic information and straightforward explanations of these
related topics. In a mere 92 pages it manages a very lucid and useful summary but, of
course, it does have its drawbacks. The most notable omission is that there are no
worked examples, and presumably this is intentional by the author and the series
editor? However, engineers learn the basic theory in order to apply these concepts to
solve industrial problems. The answer no doubt is that the students read this short
text to get a clearer and better understanding of the principles, and then solve
problems presented in a more comprehensive textbook. So will the students buy this
book with its limitations? I think that they will borrow it from the library (despite its
very reasonable price) and that its main use will be for lecturers wanting to deliver a
better explanation of this material, and also to raise some practical issues which are
scattered throughout the text.
The book is clearly laid-out with wide margins where figures and
asides/summary points are presented for quick reference. The two-phase flow is
exclusively gas-liquid flow and the first part of the book (Chapters 1 to 6) deals with
adiabatic flows (i.e. no addition or removal of heat). These chapters describe some
very important and practical aspects of two-phase flow such as the use of flow pattern
maps, pressure drop calculation and flooding. Various practical correlations are
discussed and their limitations clearly stated. The remaining chapters (7 to 11) cover
heat transfer with two-phase flow (a much more useful and common occurrence than
purely convective heat transfer), namely boiling and condensation situations. Again,
very clear explanations and evaluation of the alternative correlations, and inclusion of
many practicallindustrial considerations. For example, see page 82, section 11.4:
Real Condensation, which discusses how the real (industrial) situation differs from
the theoretical development. Section 11.6 (page 84) considers the common situation
of vapour condensation in the presence of a non-condensible gas.
Students using this book will certainly find the explanations clear and useful,
and the practical bias is refreshing and welcome. However, they will probably then
want (and need) to refer to the earlier complete text or some other source, especially
for worked examples and problems. The book by Levenspiel, O., Engineering Flow
and Heat Exchange, Plenum Press, New York (1 984) would also be a useful detailed
read on these topics.
Martyn s. Ray
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flow, 1996, two, series, university, phase, page, engineering, whalley, primer, chemical, heat, transfer, pres, oxford
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