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fluid pressure
can someone help me remember how to calculate a pressure from a velocity of water? i have a pump in a river that flows at 10 feet/sec. i need to calculate the pressure the water exerts on the pump to design the anchorage.
any help would really be appreciated.
thanks!
f=1/2 rho v^2 a c
pressure = 1/2 rho v^2 c
f= force from current
rho= density of water (not pcf, divide by gravity first)
v= velocity of water
a= x-section area of the pump
c= drag coefficient.
c for a car is about .45. maybe use high number like .7 or something.
i got 96 psf (unfactored). i assumed it is regular water not muddy (62 pcf).
thanks a lot for the quick response!
i got 96 with c=1. i assumed the pump is like a flat plate. dont take anything for granted k. i have been out of school kind of long and i dont encounter this equation when i design a house
i checked with an hydraulics engineer in house and i got the same equation. i came up with 96.89 psf. good job!

2009-09-09, 01:00 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	fluid pressure fluid pressure can someone help me remember how to calculate a pressure from a velocity of water? i have a pump in a river that flows at 10 feet/sec. i need to calculate the pressure the water exerts on the pump to design the anchorage. any help would really be appreciated. thanks! f=1/2 rho v^2 a c pressure = 1/2 rho v^2 c f= force from current rho= density of water (not pcf, divide by gravity first) v= velocity of water a= x-section area of the pump c= drag coefficient. c for a car is about .45. maybe use high number like .7 or something. i got 96 psf (unfactored). i assumed it is regular water not muddy (62 pcf). thanks a lot for the quick response! i got 96 with c=1. i assumed the pump is like a flat plate. dont take anything for granted k. i have been out of school kind of long and i dont encounter this equation when i design a house i checked with an hydraulics engineer in house and i got the same equation. i came up with 96.89 psf. good job! __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]