Electrowetting study of jumping droplets on hydrophobic surfaces
Name
897378711-MIT.pdf
Description
Full printable version
Size
3.42 MB
Format
Adobe PDF
Checksum (MD5)
db81ef176541e00ff2d72e9a8a678aa6
Author(s)
Tio, Evelyn
Advisor(s)
Evelyn N. Wang.
Date Issued
2014
Publisher
Massachusetts Institute of Technology
Abstract
Recent studies have shown that jumping-droplet-enhanced condensation has higher heat transfer than state-of-the-art dropwise condensing surfaces by -30-40%. Jumping-droplet condensation occurs due to the conversion of surface energy to kinetic energy during the coalescence of microscale droplets, resulting in droplet ejection from the condenser surface. This conversion of energy is fundamentally studied by using electrowetting to decrease the equilibrium contact angle, increasing droplet surface area. Releasing the voltage allows the droplet to release excess surface energy, causing the droplet to jump off the surface. In contrast with previous work, droplets were initially held at a static deformed state. Here, jumping from the surface from this static electrowetting-induced state is demonstrated for the first time. Releasing the voltage caused droplets to jump as high as -2 mm with a maximum conversion efficiency between surface and potential energy of -5%.
Description
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 27).
Subjects
Mechanical Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
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