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Temperature measurement of microfluids with high temporal resolution by laser-induced fluorescence
Masahiro Motosuke,Dai Akutsu,Shinji Honami 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.7
Temperature of microfluidic system is greatly sensitive because of fast heat conduction and small heat capacity due to the scale effect. The purpose of this study is the development of a measurement system for the temperature field of liquids in a microfluidic device with high spatial- and temporal- resolution. Measurement method employed in this study is laser-induced fluorescence using fluorescein with the temperature dependence of fluorescent intensity. In order to measure the transient temperature field, an image-intensified high-speed camera was utilized. The signal-to-noise ratio can be improved by the time- or phase- averaging scheme. Applying the synchronization mechanism, phaseaveraged temperature data with the time resolution of 500 μs can be obtained. Spatial resolution estimated from the Rayleigh limit was approximately 530 nm. The validity of the developed measurement system was confirmed by the experiments for the transient behavior of the liquid temperature undergoing the laser heating in the microfluidic device.
NUMERICAL INVESTIGATION ON BOTTOM GAP OF MICRO FLOW SENSOR
Abdullahl Mohd Zulkiefly,Kouta T,Kamijo Takuma,Yamamoto Makoto,Honami Shinji,Kamiunten Shoji Korea Society of Computational Fluids Engineering 2005 한국전산유체공학회지 Vol.10 No.1
Micro sensor is very useful for flow measurements in a number of engineering applications. Especially, it is necessary for the development of MEMS. This paper presents the 3D numerical simulation of flows around a micro flow sensor, which is mounted on a flat plate. The effects of the sensor configuration (i.e. bottom gap) and the Reynolds number on the flow field are numerically investigated. The numerical results indicate that the bottom gap clearly affects the flow fields over the top surface of the sensor. The Reynolds numbers also show a significant influence on the flow nature, especially on the recirculation zone at downstream of the sensor. The present results illustrate a certain improvement on the flow field for the sensor installed at O.5mm above the wall with four pillars, comparing with that directly mounted on the wall.
NUMERICAL INVESTIGATION ON BOTTOM GAP OF MICRO FLOW SENSOR
Mohd Zulkiefly Abdullah,T. Kouta,Takuma Kamijo,Makoto Yamamoto,Shinji Honami,Shoji Kamiunten 한국전산유체공학회 2005 한국전산유체공학회지 Vol.10 No.1
Micro sensor is very useful for flow measurements in a number of engineering applications. Especially, it is necessary for the development of MEMS. This paper presents the 3D numerical simulation of flows around a micro flow sensor, which is mounted on a flat plate. The effects of the sensor configuration (i.e. bottom gap) and the Reynolds number on the flow field are numerically investigated. The numerical results indicate that the bottom gap clearly affects the flow fields over the top surface of the sensor. The Reynolds numbers also show a significant influence on the flow nature, especially on the recirculation zone at downstream of the sensor. The present results illustrate a certain improvement on the flow field for the sensor installed at 0.5mm above the wall with four pillars, comparing with that directly mounted on the wall.