P16371: Controlled Oscillating Meniscus Test Fixture Charles - - PowerPoint PPT Presentation
P16371: Controlled Oscillating Meniscus Test Fixture Charles Krouse, Joseph Baldwin, Robert Walkowiak, and Alyssa Recinella 1 Team Roles Charles Krouse: Team Lead Robert Walkowiak: Master Builder Alyssa Recinella: Communications Joseph
Charles Krouse, Joseph Baldwin, Robert Walkowiak, and Alyssa Recinella
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Charles Krouse: Team Lead Robert Walkowiak: Master Builder Alyssa Recinella: Communications Joseph Baldwin: Lead Engineer
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Boiling is one of the most powerful forms of heat transfer available to us, and bubble nucleation is the vehicle of that heat transfer. Unfortunately boiling systems are incredibly chaotics and as a result bubble nucleation and boiling at high heat fluxes are not well understood. A system has been proposed that models bubble nucleation under these conditions, several subsystems of this set up are currently in development. The purpose of this project is to take what was completed for these subsystems
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○ Manual - Turn dial to adjust height of needle ■ Quick and simple ○ Automated - Program in labview to adjust height ■ Repeatable and could be automated
○ Move whole injection system ○ Move copper platform where meniscus forms
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input modules
when programming in LabView
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○ Papers ■ Heffington et al - Vibration-induced Droplet Atomization Heat Transfer Cell for High- Heat Flux Applications ■ Bennes et al - Action of low frequency vibration on liquid droplets and particles ○ (Heffington) Piezoelectric actuator at the base; vibration propels droplets upward towards a heated surface at the top of the cell ○ (Bennes) Experimental study of liquid droplet motion on a vibrating beam
○ Small with various geometries ○ Fast, accurate responses ○ Wide frequency range
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○ Papers ■ Daniel and Chaudhury - Vibration-actuated Drop Motion on Surfaces for Batch Microfluidic Processes ■ Daniel et al - Ratcheting Motion of Liquid Drops on Gradient Surfaces ■ Shastry et al - Directing Droplets Using Microstructured Surfaces ■ Noblin et al - Vibration of Sessile Drops ○ (Daniel) Investigated droplet motion on surfaces with wettability gradients; cone speaker used to induce horizontal droplet motion via vibrations at a frequency of 100 Hz ○ (Noblin) Utilized a speaker in the vibration of sessile drops
○ Cheap and available ○ Broad frequency ranges ○ Easily controlled
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○ There must be a predictable relationship between volume and output voltage from the circuit ○ The current sensor displays a strong linear relationship between voltage and volume, the collected data is shown below ■ A similar relationship would be ideal, that will be determined during feasibility testing
predictable relationship with an
will have to be designed.
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