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Archives of Heat Transfer
1988, Dubrovnik, Yugoslavia

DOI: 10.1615/ICHMT.1988.20thAHT


ISBN Print: 978-0-89116-877-5

ISSN: 0899-5311

HEAT AND MASS TRANSFER IN RHEOLOGICALLY COMPLEX FLUIDS. International Semminar 1970

pages 69-70
DOI: 10.1615/ICHMT.1988.20thAHT.50
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RÉSUMÉ

In the nearly two decades since the 1970 International Seminar in Herceg Novi on "Heat and Mass Transfer in Rheologically Complex Fluids", activity in the field has intensified and substantial progress has been made. Several of the Herceg Novi papers addressed issues which were foreseen as critical to our fundamental understanding of transport processes in rheologically complex fluids. Events of subsequent years have shown that the participants of the seminar exhibited remarkably clean insights of future needs. The rheology of suspensions is a case in point. This subject might be considered to have been the source from which modern activities in constitutive modeling have evolved. I am thinking of course of the work of Einstein in which he predicted the viscosity of a dilute suspension of rigid spheres. Fundamental studies of the rheology of suspensions after the pioneering work of Einstein, Jeffery, Frohlich and Sack, and others, were relatively infrequent until approximately 1970. The paper at the Herceg Novi seminar by Brenner sets out some of the important questions which, since 1970, have been the stimulus of the role of rotational Brownian motion on bulk stress than was available at the time of Brenner's paper. We also know much more about geometric and physicochemical effects, both of which are addressed by Brenner.
Several of the seminar papers dealt with flow instabilities and/or secondary flows. The paper by Hayes and Hutton continues to be one of the best sources for documentation of the analogue of Taylor instability in non-Newtonian fluids. That work is nicely balanced by Giesekus' description of instabilities in other flow geometries, such as free jets issuing from axisymmetric or plane channels containing grooved walls. Vinogradov documented the flowcurve discontinuity that can take place during conversion to a "high elastic state". This conversion is known to be related to the possibility of loss of adherence between a polymer and the wall of a conduit through which the polymer is flowing. The paper by Shulman, et al, illustrates the special instabilities that complex rheology confers on mass transfer in rotating fluid systems.

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