Request help with air stream force on plate problem.
Request help with air stream force on plate problem.
(OP)
I am not a student. I earned a BSME 31 years ago, but I have not really practiced engineering for years. I've been doing mostly business software development during my career. I am working on a personal project and dusting off my engineering math skills.
I need to calculate the approximate force that a rectangular plate would experience when in an air stream. I'd appreciate it if someone would check my equation and math.
Given: PlateArea = 0.0110 ft2, AirDensity = 0.002683 slugs/ft3, AirSpeed = 146.667 ft/sec
Find: PlateForce
Equation: PlateForce = ((AirDensity) * (AirSpeed)**2 * (PlateArea))/2g, where g = 32.174 slugs-ft/lbf-sec2
Soln: PlateForce = ((0.002683 slugs/ft3) * (146.667 ft/sec)**2 * (0.0110 ft2))/(2*32.174 slugs-ft/lbf-sec2)
PlateForce = 0.010 lbf
I know this seems like a student problem, but I'll send you a photo of me and my gray hair if that helps :-)
Thanks!
--Bob
I need to calculate the approximate force that a rectangular plate would experience when in an air stream. I'd appreciate it if someone would check my equation and math.
Given: PlateArea = 0.0110 ft2, AirDensity = 0.002683 slugs/ft3, AirSpeed = 146.667 ft/sec
Find: PlateForce
Equation: PlateForce = ((AirDensity) * (AirSpeed)**2 * (PlateArea))/2g, where g = 32.174 slugs-ft/lbf-sec2
Soln: PlateForce = ((0.002683 slugs/ft3) * (146.667 ft/sec)**2 * (0.0110 ft2))/(2*32.174 slugs-ft/lbf-sec2)
PlateForce = 0.010 lbf
I know this seems like a student problem, but I'll send you a photo of me and my gray hair if that helps :-)
Thanks!
--Bob





RE: Request help with air stream force on plate problem.
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RE: Request help with air stream force on plate problem.
I appreciate your help!
RE: Request help with air stream force on plate problem.
First thing I do is convert everything to metric, then solve the problem, then convert the units back.
Slugs are something you put salt on to get them out of your garden. Well, they don't leave on their own but they get easier to pick up.
Regards,
SNORGY.
RE: Request help with air stream force on plate problem.
Regards,
SNORGY.
RE: Request help with air stream force on plate problem.
p is dynamic pressure = 1/2*rho*v^2
rho is in slugs/ft^3
units work out slug/ft^3*(ft/sec)^2*ft^2 = slug*ft^4/ft^3/sec^2 = lbf
1 lbf = 1slug*1ft/sec^2 = 1lbm*g