Papers by Author: C.T. Yang

Abstract: A self-built micro-particle image velocimetry (micro-PIV) with a diode laser is established to measure the micro-fluidic phenomenon in a 100 μm rectangular capillary. By scanning method, a 3-D flow image with a flowrate of 0.3 μL/min is presented. With this calibration method, the measurement ability for 3-D micro-fluidic dynamics could be achieved. This technique also reveals its benefit and potential in metrology. Hence, it provides a helpful tool for Bio-MEMS research. The experiment is proceeded under laminar flow, Re= 0.011. The measurement range is ranging from 0.05μm/s to 4.3mm/s. The vector grid resolution is optimized to 2.5 μm.

Abstract: Fluid flow diverter serves as an essential element in high accuracy liquid flow calibration facility using a static weighing gravimetric system coupled with a flying-start-and-finish mechanism. For such flow system, stability and patterns of flow that passing through the draining nozzle and diverting module influence the accuracy of flow rate measurement. Consequently, the design and implementation of a diverter mechanism with feeding pipe section contribute dearly to the total measurement uncertainty of a standard calibration facility. In this research, a draining nozzle that changes from circular cross section to rectangular was specially developed to provide fluent flow transition. To facilitate the design process, the computational fluid dynamics (CFD) was introduced that effectively reduced the time consumption for prototype construction and test. The selected design exhibited symmetric and stable flow patterns in the desired operational flow range.