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Rapid technological progress has required reliable measurement techniques for velocity field in microspace, particularly in the biochip or electrochemical engineering. Research on the flow in microchannel is the foundation of the microfluidic-based biochip. In this paper, a micro-resolution particle image velocimetry (mu-PIV) system, with order of 1 mum spatial resolution for the measurement of velocity...
The plug-like fluidic profile is one of most advantages of electroosmotic flow, which influences the reproducibility, sensitivity and separation efficiency of the microfluidic devices. Electroosmotic flow in microchannels with hydraulic diameters of less than 20 microns are investigated experimentally and qualitatively compared with prediction in electric double layer (EDL) theory. Fluidic profiles...
The micro-flow systems have been extensively introduced into the micro-devices in Microelectromechanical System(MEMS), and the flowing characteristics determines the performance of the micro-devices to a great extent. Here, the experiments of characteristics of distilled water flow in a series of round quartz microchannels with the diameters of 13mum, 20mum and the lengths ranging from 40 mm to 100...
Macroporous silicon technology is an important method to fabricate microchannels on silicon. The formation of insulator layer on the sidewall of the channels is necessary for electrical isolation or passivation of the surface. Oxidation is one of the preferred options. In this paper we investigate the effect of various oxidation processes on the smoothness of the sidewalls of the high aspect ratio...
A thermal microsystem, integrated with pressure and temperature microsensors, is fabricated to study convective boiling under nearly uniform heat flux boundary condition. The temperature and pressure distribution along the microchannel is measured correspondingly. The pressure increases with input power when two phase flow develops. A pressure peak appears at the location of liquid-vapor interface...
Pressure drop is important in performance of MEMS devices with microchannel. The geometry of microchannel will have important significant effect on of pressure drop and friction factor. The effect of four cross section shapes of microchannel on friction factors is investigated. It is found that the friction factors are significantly affected by the cross section shape. The four cross section shapes...
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