|Aug18-11, 09:00 PM||#1|
Pressure / Vacuum Analysis During Submersion
I have a product that we perform submersion testing on to determine susceptibility to water intrusion. The product is heated to 120C and then placed in an ice bath. I have measured the pressure / vacuum during testing and have determined that the pressure can rise to 5 psi while heating and drop to -10 psi while submerged.
The ideal gas law aligns with the 5 psi while at 120C but when dunked, the calculations state that the pressure should be around -2 psi. I am trying to determine how to calculate this result. Any advice?
|Aug19-11, 02:26 PM||#2|
Double check your numbers. I get close to your measured value with ideal gas assumption.
If you want to show your math, we maybe can find the problem.
|Sep1-11, 09:52 AM||#3|
During testing of the product, I am seeing pressure swings of 12.5 psi. Initially I assumed that volume remained the same (which is not correct but I will get to that). The following are calculations:
- P1 * V1 = n R T1
- Final Pressure = (Delta T) * Initial Pressure
If I use the test data that indicates the pressure can change by 12.5 psi, the volume would need to change by approximately 41.8%. There is something else occurring that I am not accounting for. Any thoughts??? Is there anything related to humidity that might be affecting this test?
|dunk, pressure, submersion, vacuum|
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