speed of object through water
speed of object through water
(OP)
How would I calculate the rate of ascent of an object traveling up through water using bouyancy as the propellant?
Example:
an open bottomed,8 cubic foot object at 197 ft deep with 1 cubic foot of air.
I know that the weight and shape of the object will affect it's rate of ascent. I also know that as the object rises, the air will decompress to approximately 7.8 times it's original volume (P1/P2=V2/V1). So I guess I need to find out how those variables play into the rate of ascent.
Does anyone know the formulas involved, or at least some books or web sites that will help me learn how to properly calculate???
Example:
an open bottomed,8 cubic foot object at 197 ft deep with 1 cubic foot of air.
I know that the weight and shape of the object will affect it's rate of ascent. I also know that as the object rises, the air will decompress to approximately 7.8 times it's original volume (P1/P2=V2/V1). So I guess I need to find out how those variables play into the rate of ascent.
Does anyone know the formulas involved, or at least some books or web sites that will help me learn how to properly calculate???





RE: speed of object through water
RE: speed of object through water
RE: speed of object through water
You are helpful however in that I still need to figure out how to calculate speed given the geometry of the object so that I can figure the best design.
I think that I am over my head in this matter, but being that it is a very sensitive matter, I can't divulge too much about the aparatus to any outside source. This makes my task that much more difficult.
I will say that eng-tips forum is the best place that I've found on the net so far to get real answers to real questions. Most here are extremely helpful with a bare minimum of information.
So thank you very much for your reply, it is very appreciated.
RE: speed of object through water
(P1)(V1) = (P2)(V2)
or
V2 = ((P1)(V1))/(P2)
where V1 and P1 are the volume and pressure you are starting from, respectively, and P2 is the pressure at your point of consideration, which will yield your volume.
again, hope this helps
p
RE: speed of object through water
Your posts have been most helpful and are appreciated.
RE: speed of object through water
DON'T FORGET TO FACTOR IN THE WATER TEMP! TEMP=DENSITY=RESISTENCE=SPEED OF ACCENT. DEPENDING ON YOUR TIME/LENGTH OF ACCENT YOU MAY PASS THROUGH ANY NUMBER OF THERMO LAYERS PRIOR TO REACHING THE SURFACE. SORRY, DIDN'T MEAN TO BUST YOUR BUBBLE!
RE: speed of object through water