me 340 project – david christensen and vance murray – march 31, 2010
DESCRIPTION
Application of Heat Transfer to Ensure Product Safety on a Prosthetic Device for Finger Amputees. ME 340 Project – David Christensen and Vance Murray – March 31, 2010. Introduction. A prosthetic device is being made for finger amputees as a part of a BYU capstone project. - PowerPoint PPT PresentationTRANSCRIPT
ME 340 Project – David Christensen and Vance Murray – March 31, 2010
Application of Heat Transfer to Ensure Product Safety on a Prosthetic Device
for Finger Amputees
ME 340 Project – David Christensen and Vance Murray – March 31, 2010
Introduction
•A prosthetic device is being made for finger amputees as a part of a BYU capstone project.
•During user testing, the user mentioned the possibility of using the device to pull things out of the oven after they have cooked.
•In order to determine if that would be safe, we have conducted both analytical and physical tests.
Video
ME 340 Project – David Christensen and Vance Murray – March 31, 2010
Problem Set-Up
Find•Temperature of the surface of the device near her hand over time
Given•T oven = T pan,i = 350˚ F•T device,I = T∞ = 69 ˚ F
After heating the pan to a temperature of 350˚ F, the device was used to remove the pan from the oven. A thermocouple was used to measure the temperature at one location near her hand over an interval of one minute.
ME 340 Project – David Christensen and Vance Murray – March 31, 2010
Results
Experimental Solution
Time (seconds) T surface (˚F)
0 72
10 72
20 72
30 72
40 73
50 73
60 74
Results
ME 340 Project – David Christensen and Vance Murray – March 31, 2010
Results
Analytical Solution
ResultsAccording to our model, in would take almost four minutes to reach a dangerous temperature.
Set-upLumped capacitance method was used to test the time it would take to cause harm (T = 120 ˚ F) if the pan stayed at a constant temperature of 350 ˚ F (pan on stove).
ME 340 Project – David Christensen and Vance Murray – March 31, 2010
Conclusions
•The device seems suited to safely handle the thermal conditions that would be required to pull something out of the oven.
•However, proper care must be taken to allow some cooling at the tip before touching the device with the user’s other hand.
•Also, care must be taken to ensure the hot item is tightly secured by the device.
ME 340 Project – David Christensen and Vance Murray – March 31, 2010
AppendixAdditional Calculations Additional Pictures
Calculations of the device modeled as a fin with steady state conditions