DIGITAL ENGINEERING SEMINAR :DIGITAL ENGINEERING SEMINAR :

The past, present and future of shock wave researchThe past, present and future of shock wave research

2121 stNovember 2013From 13.00-16.00

หอ้งประชุมเจริญวิศวกรรม ชัน้ 2 ตึกเจริญวิศวกรรม ( ตึกวิศวกรรมศาสตร์ 4 ) จุฬาลงกรณ์มหาวิทยาลัย

Shock wavesShock waves are multifaceted non-linear phenomena

typically described by hyperbolic partial differential

equations. However, we know that in nature there are

many phenomena are very analogous to shock waves,

sometimes called shock wave-like phenomena but lack in

their mathematical formulations. If formularized, they

would definitely belong to a family of hyperbolic partial

differential equation of higher order of non-linearity. At the

moment the shock wave research is devoted to shock wave

phenomena described by the existing mathematical

formulations. From experimental point of view, Toepler

photographed, for the first time, shock waves generated by

spark discharges and exhibited their sketches at the World

Expo held in 1867 at Paris! The shock wave research was

directed in the early 20th century merely to resolve disasters

caused by dust explosions in coal mines and then

hibernated for long time. It revived during the World War II

as one of the wartime research and was summarized in R.

Courant and K.O Friedrichs, Shock Waves and Supersonic

Flows, Wiley Interscience, 1948. In the advent of space

exploitations, it became one of current topics of closely

2nd floor, Charoen Visawakaam Building (Building 4)

Meeting room, Faculty of Engineering

Organized by: National Science and Technology Development Agency (NSTDA) www.nstda.or.th

PhatchariPhatchari NimsrikulNimsrikul

Tel. 02-5646955-58

phatchari@nstda.or.th

Contact person :

exploitations, it became one of current topics of closely

supporting atmospheric re-entry of space vehicles. The

history of shock wave research is found in P. Krehl, History

of Shock Waves, Explosion and Impacts, Springer, 2008 and

then one will find that today it established by itself to be not

only important topic of high-speed gas dynamics but also a

unique interdisciplinary researches. The interdisciplinary

character of shock wave phenomena is well documented by

I.I. Glass, Shock Wave and Man, Toronto University Press,

1975. The advancement of laser technology, micro-

electronics, and super-computations drastically widened the

scope and depth of shock wave researches, which have

never been expected in the past. In this presentation, the

author will demonstrate his continuous devotion to shock

wave research for 40 years. In starting high-speed gas-

dynamic topics, the author wishes to explain its

colorful applications to geo-sciences, medicine and biology,

and industries, and wishes to emphasize that shock wave

phenomena do exist in our daily life but no one cares them.

Double exposure holographic interferometric

observation of a 15mm diameter cylinder launched

into air at 10 kPa. The propagation speed is 2.7km/s. We can see bow shock over the cylinder.

Attenuation of a shock wave of Ms = 1.5 in

atmospheric air propagating over arrayed

cylinders in a 60mm and 150mm cross sectional

shock tube. Successive complex interaction of the

shock wave with cylinders effectively mitigates the shock wave.

SEMINAR PRESENTED BY :SEMINAR PRESENTED BY :

Emeritus Professor Dr. Kazuyoshi Emeritus Professor Dr. Kazuyoshi TakayamaTakayama

Cardio-vascular Department

Tohoku University

Sendai, JAPAN

Professor Kazuyoshi Professor Kazuyoshi TakayamaTakayama obtained hisdoctoral degree from Tohoku University in 1970.

He was appointed director of the Shock Wave

Research Center at the Institute of High Speed

Mechanics (Institute of Fluid Science) in 1988. He retired in 2004 and became

emeritus professor of Tohoku University. In 1990 he launched Shock Waves, an

international journal, taking on the role of managing editor and in 2002 became

editor-in-chief. He was elected president of the Japan Society for Aeronautical and

Space Sciences for one year in 2000 and was chairman of the Japanese Society of

Shock Wave Research in 2000. He was appointed president of the International Shock Wave Institute (ISWI) in 2005 and 2009.Wave Institute (ISWI) in 2005 and 2009.

1970 Flow visualization of shock tube flows shadowgraph, schlieren method.

1975 Double exposure holographic interferometry applied to underwater shock

wave research.

1980 We worked on intensively underwater SW created by micro-explosions and

clarified shock/bubble interaction.

1981 We started experimentally underwater shock wave focusing and its application.

1982 Extra Corporeal Shock Wave Lithotripsy (ESWL) collaboration with urologist.

1987 ESWL prototype device was approved by Ministry of Health. We worked to

clarify tissue damage created during ESWL.

1994 We expanded tissue damage mechanism to shock wave treatment for cerebral

embolism, which was technically completed but not used for clinical purpose. We

applied the same skill to dissect soft tissues less invasively for clinical purposes.

2001 Application of pulsed Ho:YAG laser-induced liquid jet Laser ablation assisted drug

delivery.

2007 Application of shock focusing to cure arrhythmia Clinical success of water jet

dissection device.

2012 Today we are working on the construction of prototype device to cure arrhythmia

by high pressure exposure onto nerve cells in myocardium.

Hosted by: Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University