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Current Research
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• Microfluidics • Brain Imaging • Functional Surface • Thermal Switch |
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Past Research | |
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• Nano & Micro Scale Thermosciences • Energy Harvesitng • Information Sciences |
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Functional Surfaces |
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| SINGLE BUBBLE DYNAMICS ON A HYDROPHOBIC SURFACE | ||
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Motivations Fundamental understanding of bubble dynamics on various surfaces is essential to predict the phase change heat transfer performance and design bubble-driven microfluidic devices. In this study, we present very different bubble dynamics on a hydrophobic surface. This is the first quantitative study of single bubble dynamics on a hydrophobic surface having a contact angle greater than 100º. Fundamental understanding of bubble dynamics on heated hydrophobic surfaces will help to develop chemically patterned surfaces with enhanced boiling heat transfer and novel phase-change based micro-actuators and energy harvesters. Unique bubble dynamics on a hydrophobic surface The bubble on the Teflon-coated wafer has about a three times larger departure diameter and 60 times longer growth period than one on the bare silicon wafer. On the hydrophobic surface, the bubble departs from the surface after a short necking period and leaves behind a small residual bubble nucleus on the surface, which then grows in the next cycle. As a result, no waiting period is observed. |
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Hydrophobic surface
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Hydrophilic surface
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