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 Baldwin: Lead Engineer 2
Background 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 over the summer and advance them towards completion. 3
Current Status 4
Customer Requirements 5
Engineering Requirements 6
House of Quality 7
Functional Decomposition 8
Morph Chart 9
Morph Chart Options 10
Pugh chart 11
12
Feasibility Analysis 13
Subsystem Divisions 14
Budget Benchmarking 15
Benchmarking - Height Adjustment ● Actuation ○ Manual - Turn dial to adjust height of needle ■ Quick and simple ○ Automated - Program in labview to adjust height ■ Repeatable and could be automated ● Two approaches ○ Move whole injection system ○ Move copper platform where meniscus forms 16
Injection System 17
Benchmarking - LabView ● Have available in the team a NI cDAQ-9172 and NI-9205 analog input modules ● Specifications are available from NI ● Numerous and varied tutorials are available online for best practices when programming in LabView ● A links to a few NI tutorials for programming LabView are available on our Edge site 18
Benchmarking - Oscillator ● Piezoelectric Actuator ○ 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 ● Perks of piezos: ○ Small with various geometries ○ Fast, accurate responses ○ Wide frequency range 19
Benchmarking - Oscillator ● Cone Speaker ○ 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 ● Perks of Speakers ○ Cheap and available ○ Broad frequency ranges ○ Easily controlled 20
Benchmarking - capacitive sensor ● Capacitive Sensor ○ 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 ● If the sensor does not display a predictable relationship with an oscillating meniscus a new sensor will have to be designed. 21
Future Plan For the next three weeks (week 7 - week 9) Identify and solicit support from specific faculty members. Refine any requirements and/or functions as necessary. Create a functional decomposition for each subsystem. Generate more specifics for feasibility analysis. Demonstrate feasibility. Demonstrate proof of concept for each subsystem. Conduct preliminary engineering analyses for each subsystem. Bake more goodies and gain a few pounds from aforementioned goodies. Participate in group bonding bike ride. 22
Your Turn ● Feasibility assessment ● Areas of weakness ● Identify gaps ● Area of biggest concern ● Next steps ● EDGE 23
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