Calculating pressure of air pocket in a pressurized water column

AI Thread Summary
To calculate the pressure of the air pocket in a pressurized water column, it's essential to clarify the setup: a 2-inch vertical pipe, capped, containing 2 inches of air at the top and 40 psi of water at the bottom. The pressure measurement of 40 psi is taken at the bottom of the 24-inch tall pipe. As the water rises, the pressure decreases due to the height of the water column. The pressure drop can be calculated using hydrostatic pressure principles, factoring in the height of the water column and the density of the water. Understanding these elements will provide clarity on the pressure dynamics within the system.
cvsanders
Messages
2
Reaction score
0
TL;DR Summary
Calculating pressure of air pocket in pressurized water column.
Looking for some guidance in calculating pressure of air pocket in pressurized water column. Example: 2" vertical pipe, capped, with 2" of air and 40 psi water applied.
 
Engineering news on Phys.org
Welcome to PF. :smile:

Presumably the air bubble is at the top of the column, right? Where are you measuring the 40psi water pressure? At the top or bottom of the water column? How tall is the pipe?
 
Water supply line pressure is 40 psi, air is at top of 24" column, where it is being read.
 
So the 24" tall pipe has 40psi water at the bottom. How much does the pressure drop going up that water column...? :smile:
 
Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
Carburetor CFM A Holley Carb rated at 500 cfm 2 barrel carb has venturi diameter of 1.3/8". There are 2 barrel carbs with 600 cfm and have 1.45 diameter venturi. Looking at the area the 1.378 bore has 5.9 sq. Inch area. The 1.45 dia. has 6.6 sq. inch. 5.9 - 6.6 = 0.70 sq. inch difference. Keeping the 500 cfm carb in place, if I can introduce 0.7 sq inch more area in the intake manifold, will I have the same potential horsepower as a 600 cfm carb provide? Assume I can change jetting to...
I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
Back
Top