Capillary Filling in Rectangular Microchannels Fabricated with SU-8 Photoresist

• Main Authors: Chung-Hsun Lin, 林重勳
• Other Authors: Shiu-Wu Chau
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/44633823898330074481

碩士 === 中原大學 === 機械工程研究所 === 94 === This paper investigates capillary filling in rectangular microchannels which is driven by surface tension. We compare our new theoretical analysis with our experimental measurements to understand the interfacial phenomena of capillary filling in rectangular microchannels. The rectangular microchannels are fabricated with thick film SU-8 photoresist on silicon substrates, and the microchannels heights are all 500μm, and the microchannels are 50μm, 75μm, 100μm, and 150μm wide. We used lubrication oil, olive oil, cleanser, and silicon oil, to observe capillary filling with the high speed CCD camera. Capillary filling in rectangular microchannels which is found to be related to the dynamic contact angle, Ohnesorge number, Oh, and dimensionless parameter . Our experimental measurements reified this new theoretical model of describing the capillary filling behavior. The dynamic contact angle depends on Oh and f Re, the capillary filling distance scales with the square of capillary filling time.