Chia-Shun Yih
1918-1997
Our good friend and colleague
Chia-Shun (Gus) Yih passed away on April 24, 1997 . He fell ill en route
to Tokyo , J apan
He will be
deeply missed by all who knew him.
Obituary
(written by David) AA News, 29 Apr 97
Those wishing to respond directly to
Shirley can do so at:
77 Pond Ave , Brookline ,
MA 02445
Preface from
Selected Papers by Chia Shun Yih
With permission. Copyright @ 1991 World Scientific Publ.
Co.
This includes comments by Sung-Piau Lin, W. Michael
Lai, C.C. Lin, Yuan-Cheng Fung,
George Batchelor, and Stephen H. Davis .
Doctoral
Students of Professor Chia-Shun Yih
Excerpt
from "Wintersweet," by Chia-Shun Yih
Technical
symposium memorial celebration J uly 31, 1997
Photo of
Chia-Shun Yih Symposium Participants (1985)
Please
view or sign the guestbook
Maps to and
of Ann Arbor
Chia-Shun
Yih Seminar
Emil Hopfinger , University of Grenoble
Atomization
of a Liquid J et by a Coflowing Gas
Stream:
From Interfacial Instability to Drop Formation
Break-up and atomization of liquid
surfaces or liquid/gas interfaces have widespread applications, ranging from
two phase combustion to household sprays. For this reason, atomization and
related problems have received considerable attention and various correlations,
relating for instance the drop size to the flow variables, have been proposed.
Recent, more deterministic approaches, aimed at understanding the mechanisms,
attempted to relate the drop size to the relevant instabilities. The present
talk will be focused on these, more deterministic studies.
After a rapid discussion of the different
types of liquid jet instabilities and the relevant governing parameters,
experimental results on Kelvin-Helmholtz instability of a gas/liquid shear
layer will be presented. These results, together with a stability analysis,
clearly show that when the gas momentum flux is large, the most amplified
wavelength of this primary instability is controlled by the vorticity layer of
the gas jet at the nozzle exit. However, no direct relationship between the
droplet size and this wavelength emerges. The mean droplet size is rather
related with the wavelength of a secondary, transverse instability. Various
secondary instability scenarii have been proposed,
the most likely one being a Rayleigh-Taylor
instability of the liquid crests resulting from the primary instability. Recent
experimental results will be presented which support such a Rayleigh-Taylor
instability mechanism leading to droplet formation.
in
the Chesebrough Auditorium,
This also is the Mechanical
Engineering Sesquicentennial Lecture. A reception in the Chesebrough
lobby will immediately follow the lecture.