Art and Sciences
(click on images below to see a larger image)
studies of cardiovascular systems in more than 50 surviving pages
from 2 phases of his research (around 1508—1509 to 1513), are a
clear demonstration of his observational genius and progressive
deduction of cardiac mechanics and the vascular system.
carried out a detailed hemodynamic study of the aortic valve
motion and the role of sinus Valsalva in the closure dynamics of
the aortic valve, and he accurately correlated the formation of
vortices with the separation of a retarded (shear) layer from the
lips of the leaflets. In-vivo verification of vortex formation
in the sinus of Valsalva during the systolic phase awaited the
application of modern phase-averaged magnetic resonance imaging
techniques. Did Leonardo actually build the glass model he twice
mentioned, thus performing the first scientific flow visualization
of impulsive vortex formation or other fluid mechanical phenomena?
Evidence in support of this possibility can be found in both the
unusually schematic style he employed for the suite of drawings
and the recent flow imaging results obtained in our laboratory
through laser based imaging technique.
A replica of the heart valve designed by Leonardo da Vinci was
created by Professor Gharib, Dr. Arash Kheradvar (MD), Mr. Richard
P. Gerhart (Caltech Glass shop), and Mr. David Kremers and became
part of the exhibit, Leonardo Da Vinci: Experience, Experiment,
and Design, at the
Victoria and Albert Museum in London (14 September 2006 - 7
January 2007). Click
here for the press release (pdf) announcing the exhibit.
Gharib M, Kremers D, Koochesfahani MM, et al., Leonardo's vision
of flow visualization, EXP FLUIDS 33 (1): 219-223 JUL 2002
Reference: Leonardo's Dream Machine, PBS
Paper Reference: http://www.artakt.co.uk/experience