研究领域
We report techniques to characterize the transport properties as well as velocity fields of liquids flowing in microchannels. Microscopic particles of a precisely defined diameter are dispersed in a liquid of interest and their cross-stream Brownian motions are analyzed to determine the local Brownian diffusivity, which is in turn a function of the viscosity or mass concentration. We apply the proposed techniques to determine the viscosity and mass diffusivity of mixtures of glycerin and water, which agree well with the literature values. The techniques developed in this work will enable massively parallel characterization of novel liquids and their mixtures as well as in situ performance evaluation of microfluidic devices.
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Youngsuk Nam, Stephen Sharratt, Chan Byon, Sung Jin Kim, and Y.Sungtaek Ju, “Fabrication and Characterization of the Capillary Performance of Superhydrophilic Cu Micropost Arrays,” accepted for publication in Journal of Microelectromechanical Systems, in press (2010)
Gisuk Hwang, Youngsuk Nam, Evan Fleming, Pete Dussinger, Y.Sungtaek Ju, and Massoud Kaviany, “Multi-Artery Heat Spreader: Experiment,” accepted for publication in International Journal of Heat and Mass Transfer, in press (2010)
Gilhwan Cha, Y. Sungtaek Ju, Louise A. Ahure, and Norma M. Werely, “Experimental Characterization of Thermal Conductance Switching in Magnetorheological(MR) Fluids”, accepted for publication in Journal of Applied Physics, 2010
Y. Tanye Tang, Jichul Kim, Hector Lopez-Valdes, KC Brennan, and Y. Sungtaek Ju, “Microfluidic Chamber with Active Suction Ports for Localized Chemical Stimulation of Brain Slices,” to be presented in MEMS 2010, January 24-28, Hong Kong, China
Gilhwan Cha, Y. Sungtaek Ju, Louise A. Ahure, and Norma M. Werely, “Experimental Characterization of Thermal Conductance Switching in Magnetorheological Fluids under Magnetic Fields”, Proceedings of 11th Joint MMM-Intermag, January 18-20, 2010, Washington, DC, USA
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