P16371: Controlled Oscillating Meniscus Test Fixture
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Subsystem Build & Test

Table of Contents

The Deliverable of P16371 MSD Team

It's expected that this MSD team designs and constructs a device that is capable of meeting the customer requirements as outlined in the problem definition. Specifically, this means that the device must create a stable liquid meniscus, oscillate the meniscus at a frequency of approximately 100 Hz, be capable of utilizing multiple different working fluids, be able to interface with the other subsystems, and it must be reliable. In order to fulfill the customer requirements, it's also expected that the MSD team designs a computer program that allows for adequate control of the device. Therefore, upon completion of MSD II the customer will receive a device that meets his requirements along with a program that is capable of supplying the necessary controls. It's the customer's desire that the device which is being designed and constructed by this MSD team will enable him to conduct his doctoral research.

Team Vision for Subsystem Build & Test Phase

Anticipated Tasks

For the subsystem build and test phase, our team expected to accomplish the following tasks:

Accomplished Tasks

The following tasks were actually accomplished during the subsystem build and test phase:

Imagine RIT Project Description

Dancing Bubbles Used to Study Boiling Systems

Have you ever seen water dance to Taylor Swift? Or rock out to Crazy Train? Visit our exhibit to see what we’re talking about and have fun blowing some bubbles. Our amazing senior design team will ‘boil down’ our Multidisciplinary Senior Design project and leave you feeling ‘cool.’ Boiling systems, such as a boiling pot of water, are incredibly effective at removing vast amounts of heat from a surface. For example, bubbles dissipate heat from the bottom of the pot of boiling water via bubble nucleation. However, boiling is a complex and chaotic phenomenon, and the fundamental physics are not well understood. If a greater understanding of bubble nucleation can be acquired, then more efficient designs for applications such as jet engines, computer chips, and nuclear plants can be developed. For this reason, the RIT Thermal Analysis, Microfluidics, and Fuel Cell Laboratory has proposed a system that is capable of studying the basic fundamentals of boiling. Our Multidisciplinary Senior Design team was tasked with designing and fabricating a device that is capable of conducting such an investigation. In order to study boiling fundamentals, our device was required to create a stable liquid meniscus, control the liquid volume of the meniscus under varying heating scenarios, and oscillate the meniscus over a range of frequencies. It’s anticipated that our device can be utilized by the RIT Thermal Analysis, Microfluidics, and Fuel Cell Laboratory in order to gather a more robust comprehension of bubble nucleation and enhance heat dissipation in a broad range of applications.

A PDF of the Imagine RIT project description can be opened by clicking here.

Large Speaker Testing

After completing testing with the large speaker, it was decided that the final system design will utilize the larger speaker rather than the small speaker, because the large speaker produced larger, more noticeable oscillations. Additionally, it was decided that the gasket material for the final design with be a flexible Si material, because this material also produced the best oscillations. A few of the videos captured during testing are provided in the table below. There are also images provided below of the test setup utilized for making these design decisions.

Videos

Video description Link to video
Flexible Si gasket at 22Hz Click here.
Flexible Si gasket at 22Hz Click here.
Rigid Si gasket at 22Hz Click here.
Image captured from testing of the large speaker.

Image captured from testing of the large speaker.

Image captured from testing of the large speaker.

Image captured from testing of the large speaker.

Test Setup

SolidWorks visual of the test setup.

SolidWorks visual of the test setup.

Test setup during testing. The meniscus is difficult to see because of the manner in which the light source was utilized in order to capture the best video quality.

Test setup during testing. The meniscus is difficult to see because of the manner in which the light source was utilized in order to capture the best video quality.

Image of a meniscus with the preliminary heater design.

Image of a meniscus with the preliminary heater design.

The Stage

At this time we have received the stage that we will be utilizing for our final fixture. Therefore, we will now begin LabVIEW programming in order to integrate controls so that the height adjustment subsystem can be controlled via LabVIEW. This also implies that we will begin integrating PID controls for controlling the volume of the meniscus.

Stage from Optics Focus Instruments.

Stage from Optics Focus Instruments.

Updated Gantt Chart

Changes to the Gantt chart from the previous design review are as follows:

Dates outlined in the updated Gantt chart.

Dates outlined in the updated Gantt chart.

Visual display of the updated Gantt chart.

Visual display of the updated Gantt chart.

An image of the complete Gantt chart can be seen by clicking here.

Bill of Materials

Current bill of materials

Presently, we have spent $1,040.67 of our $5,000 budget.

Item Price
2.5" round speaker from Jameco Electronics $6.09
6.5" round speaker from MCM Audio $33.68
6061 Aluminum round rods $249.37
Brake hose $15.97
Teflon PTFE 0.01" gasket material $17.76
Carbide turning inserts $33.75
Optics Focus Instruments lab stage $379.05
Arcus Technology stepper motor $305.00
TOTAL $1,040.67

Design Review Materials

Item Link to document
Project readiness package Click here.
Team norms Click here.
Gantt Chart Click here.
One of our great videos Click here.

Plans for Integrated Systems Build & Test Phase

For the next phase, the integrated systems build and test phast, our team expects to accomplish the following tasks:

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