|
Plenary Lecture
Velocity Field Measurements of Various Opaque Flows Using X-ray Imaging Techniques
Professor Sang-Joon Lee
Dept. of Mechanical Engineering
Pohang University of Science and Tech. (POSTECH)
San 31, Hyoja-dong, Pohang 790-784,
Korea
Tel: 82-54-279-2169
Fax: 82-54-279-3199
E-mail: sjlee@postech.ac.kr
Abstract:
Flow visualization has become an indispensable tool in the analysis of
various transport phenomena. Recent advances in digital image processing
techniques have made it possible to extract quantitative flow information
from visualized flow images of tracer particles. Optical visualizations or
PIV velocity field measurement techniques use commonly lasers as a light
source. Because they can be applied only to transparent fluids with clear
windows, they are ill-suited in measuring fluid flows confined in opaque
materials or non-transparent fluids such as blood. To resolve these
limitations, a transmission-type light source such as an X-ray or ultrasonic
wave is required. For measuring opaque fluid flows or flows inside opaque
conduits, an X-ray micro-imaging technique in which x-ray beam is used as a
light source was developed. To visualize flows inside an opaque tube, X-ray
beam from the synchrotron radiation source of PLS (Pohang Light Source) was
used. In the X-ray micro-imaging, the refraction or Fresnel edge diffraction
mechanism was adopted to improve the image quality. The relative weights of
the refraction and Fresnel diffraction depend on the given experimental
conditions, the type of specimen, and the information to be extracted. Using
the X-ray micro-imaging technique, several opaque flows were visualized
quantitatively. Examples include a glycerin flow inside an opaque Teflon
tube, sap flow inside xylem vessels of a bamboo leaf, blood flow and
micro-bubbles moving in an opaque tube.
Brief Biography of the Speaker:
Sang-Joon Lee
Dept. of Mechanical
Engineering
Pohang University of Science
and Tech. (POSTECH)
San 31, Hyoja-dong, Pohang
790-784, Korea
Tel) 82-54-279-2169
Fax)
82-54-279-3199
E-mail:
sjlee@postech.ac.kr
Research Interests:
· Experimental Fluid Mechanics
· Advanced Flow Visualization
· Micro-fluidics and Bio-fluid Flows
· Flow Control, Turbulence
· Bluff Body Aerodynamics, Wind Engineering
Education: 1980 Busan
National University, BS
1982 Korea Adv. Inst. of Sci. & Tech. (KAIST), MS
1986 Korea Adv. Inst. of Sci. & Tech. (KAIST), Ph.D.
Experience:
1986. 2 -
1986. 12 Korea Inst. of Machinery and Metal
Senior Researcher
1988. 9 -
1989. 9 Imperial College, London
Visiting Professor
1996. 8 -
1997. 8 Johns Hopkins University
Visiting Professor
1991. 1 -
Present Pohang Steel & Iron Co. (POSCO) Advisory
Professor
1987. 1 -
Present POSTECH
Professor
2000. 6 -
Present National Research Lab.(Flow Visualization) Principal
Investigator
2006. 1 -
Present Advanced Fluid Engineering Research Center Director
Academic Society Activity
International Journal “Wind
& Structures”, International Editorial Board Member
International Journal
“Journal of Visualization”, Regional Editor
International Journal of
Vascular Biomedical Engineering, Editor
KSME Journal: Editor for
Fluid Mechanical division
Wind Eng. Institute of
Korea: director (1997-2003), vice president (2003-)
Korea Soc. of Visualization
(KSV): director (2001-), vice president (2005-), KSV Journal: Chip editor
Biomedical Eng. Society for
Circulatory Disorders : director (2001-), vice president (2005-)
ASME, AIAA, JSME : Member
Asian Fluid Mechanics Committee, Member
Assembly of World Conferences on Exp. Heat
Transfer, Fluid Mech. & Thermodynamics., Member
Awards:
Namheon
Academic Award, KSME, 1997
Academic
Award, KSME, 1998
JeChul
Technology Award, POSCO, 1999, 2000
Best Paper
Award, SNAK, 2003
Korea Patent
Grand Exhibition, Silver Medal, 2003
JOV Award,
Visualization Society of Japan, 2007
|
