School of Mechanical Engineering Seminar
Monday, January 2, 2023 at 14:00
Wolfson Building of Mechanical Engineering, Room 206
Microfluidics for insect wing circulation: A study on transient perfusion in a dragonfly forewing
Sangjin Ryu, PhD
Associate Professor
Department of Mechanical and Materials Engineering
Nebraska Center for Materials and Nanoscience
University of Nebraska-Lincoln, Lincoln, USA.
Insect wings consist of a network of veins and thin membrane. Hemolymph (blood), nerves, and tracheal branches exist within these veins. Because blood flow provides the sensory organs and other tissues with water and nutrients and removes waste products, hemolymph flow through veins is critical for the functionality of the wings. However, it is little understood how hemolymph circulation is related to wing venation. Previous studies tracked hemocytes (blood cells) in partly transparent veins of living specimen, but they offered limited insight into some flow patterns. For detailed investigations of hemolymph flow in complicated wing venation, we have developed a microfluidic wing vein model of the forewing of the dragonfly, Anax junius. Transient blood flow was simulated by injecting dyed water into the veins using a range of flow velocities and inflow locations. Microbeads were used to visualize local flow patterns within the veins. Visualized flow patterns suggested that the perfused portion of the vein network increased in a certain scaling relation with respect to time. Our biomimetic wing vein device enables further investigation into the unique circulatory system and transport phenomena of the insect wing.
Bio: Dr. Sangjin Ryu is an Associate Professor with the Department of Mechanical and Materials engineering, the University of Nebraska-Lincoln (UNL), USA, and a faculty member of Nebraska Center for Materials and Nanoscience of UNL. Dr. Ryu received the B.S. and M.S. degrees in Mechanical Engineering from Seoul National University, South Korea, in 1997 and 1999, respectively, and the Ph.D. degree in Mechanical Engineering from Massachusetts Institute of Technology, USA, in 2009. Dr. Ryu worked as a researcher for Daewoo Commercial Vehicle, Korea, for 1999–2001 and Agency for Defense Development, Korea, for 2001–2004. He also worked as a postdoctoral researcher at Brown University, USA, for 2009–2011 before joining UNL. Dr. Ryu was the recipient of the Graduate Study Abroad Scholarship from Korea Science and Engineering Foundation (2004–2006), UNL College Distinguished Teaching Award and Holling Family Master Teacher Award from UNL (2019), and Outstanding Faculty Award from UNL Pi Tau Sigma (2019). Dr. Ryu’s research interests include microfluidics, interfacial fluid dynamics and cell mechanics.
https://tau-ac-il.zoom.us/j/4962025174?pwd=bVJUeElXRUUya3BERisyNllLOE9EZz09
