文档介绍：Non-Linear Mass Transfer and
Hydrodynamic Stability
by Khristo Boiadzhiev, Vladislav Nikolaevich Babak,
C. B. Boyadjiev (Editor)
· ISBN: 0444504281
· Pub. Date: July 2000
· Publisher: Elsevier Science & Technology Books
XI
PREFACE
The linear theory of mass transfer is characterised by three basic features:
1 .The mass transfer rate does not depend on the direction of mass exchange between
phases (for example absorption and desorption rates are equal).
2. The Sherwood number does not depend on concentration.
3. Mass transfer does not influence the hydrodynamics.
Experimental studies of many authors show considerable deviations from the linear
theory. Several references (see references of Introduction [1 - 10]) indicate influence of the
interphase mass transfer direction on the mass transfer rate in the phase. The influence of
concentration on the Sherwood number is noticed in a number of cases, when the mass
transfer is panied by a chemical reaction [11]. Most often the deviations of the
experimental data from the linear theory are in the cases of increasing the mass transfer rate,
which is explained by spontaneous (surface, interphase) turbulency, Marangoni effect, self-
organising dissipate structures, etc. [1, 2, 5 - 8, 10 - 13].
All deviations of the experimental data from mass transfer linear theory, mentioned
above, are result of different non-linear effects that will be discussed in this book.
The problems of non-linear mass transfer appear in connection with the examination
of systems with intensive mass transfer. A series of non-linear effects in the mass transfer
ics occur under these conditions as a result of the development of big concentration
gradients in the transferred material. These effects have various manifestations, but their
influence on the mass transfer rate can always be regarded as interconnected.
The theoretical analysis of the mass transfer ics permits the diff