Kwang-Yong Kim Seminar

Event Date: August 1, 2014
Hosted By: AAE
Time: 10:30am
Location: ARMS 1028

Enhancement of Mixing in Passive Micromixers

Kwang-Yong Kim
Department of Mechanical Engineering, Inha University
Incheon, Republic of Korea

Mixing of fluids in channels of sub-millimeter dimensions is a fundamental operation required on microfluidic devices. The flow in such devices is laminar which makes it difficult to mix the fluids in a simple smooth microchannel. A wide variety of micromixers are operating on different mixing principles. Micromixers can be broadly classified as active and passive micromixers. Most of the passive micromixers are based on shape modification of the microchannels to produce a specific flow pattern which enhances mixing. The speaker has developed several innovative methods to enhance mixing in passive micromixers mostly using numerical and optimization techniques in last decade. Based on these researches, a review on enhancement of mixing in different types of passive micromixers will be presented in this seminar. The focus will be on recent developments on passive micromixers operating under steady and unsteady flows. Computational fluid dynamics has proved to be a reliable tool for analyses of flow structures and mixing behavior in micromixers. To study the flow dynamics and mixing performance, Navier-Stokes equations and a diffusion-convection model for species transport are solved, respectively. A variance-based method was employed to evaluate the mixing performance of the micromixers. Design optimization coupled with 3D Navier-Stokes analysis has become an efficient tool for the design of micromixers. New concepts of various micromixers are introduces with optimization of the geometries to maximize the mixing in those micromixers.

Kwang-Yong Kim received his B.S. degree from Seoul National University in 1978, and his M.S. and Ph.D. degrees from the Korea Advanced Institute of Science and Technology (KAIST), Korea, in 1981 and 1987, respectively. He is currently an Inha Fellow Professor in the Department of Mechanical Engineering of Inha University, Incheon, Korea. Professor Kim is also the current editor-in-chief of the International Journal of Fluid Machinery and Systems, and the chairman of the Asian Fluid Machinery Committee. He served as the editor-in-chief of the Transactions of Korean Society of Mechanical Engineers and president of Korean Society of Fluid Machinery. He is also a fellow of the American Society of Mechanical Engineers (ASME) and an associate fellow of the American Institute of Aeronautics and Astronautics (AIAA). He is interested in application of the numerical optimization techniques using various surrogate models and computational fluid dynamics to the designs of fluid machinery, heat-transfer augmentation devices, micro heat sinks, micro mixers, coolant channels in nuclear reactors, etc. He has published 285 peer-reviewed journal papers, and presented more than 400 papers at international/domestic conferences.