Many times the pipe shoe will be "scalloped" where it contacts the pipe to reduce heat transfer. Semicircular cuts are made in the plate so that only 1/4 to 1/3 of the plate actually contacts the pipe.
Does the gearbox operate at atmospheric pressure or at a slight vacuum? The high speed gearbox on some centrifugal compressors that I'm familiar with uses an air ejector to operate the sump at a partial vacuum. I'm told that this reduces foaming tendencies, as well as eliminating oil leaks.
I'm attempting to model the fluid dynamics of a 2 stage gas gun, which is essentially an oversized BB gun. When examining the internal ballistics of any gun, the projectile can never go faster than the speed of sound of the propelling medium. By causing air (or another inert gas) to undergo...
I would suggest API 650 for the storage tank design. The basic standard includes tanks operating up to 200 °F, but with incorporation of the additional requirements of Appendix M, the upper limit on temperature can be up to 500 °F. Piping would likely be designed to ANSI/ASME B31.3 requirements.
Flow velocity guidelines are "rules of thumb" to start with, before considering pressure drop. For critical systems, pressure drop requirments override the velocity guidelines.
I'd like to re-itterate that it is unlikely you will have a problem. The aerospace structures where the phenomena is significant are very light weight and excited by very high level pressure fluctuations. If your duct is 3/8" thick steel with refractory lining, it is hardly a light weight...
Is this a liquid/liquid, gas/liquid, liquid/gas, or gas/gas system with respect to the main duct and the injection?
The only mechanism I can fathom (other than vortex shedding on the cantilever that you mentioned) would be vortexes shed by the turbulent free jet (assuming gas/gas). I've seen a...
Nearly anything is POSSIBLE. But a 27'D x 90'H tank would have some difficulties. The foundation design to resist the seismic and wind moments (not to mention dead weight) would be a challenge. Also, the tank's shell will need to be thicker than you think near the bottom to avoid buckling...
I would think that for this application, you would want as "sharp" a pulse as possible, by having the quickest opening valve available. This would be similar to a baghouse dust collector pulse valve. These are typically diaphragm type quick exhaust valves. The same type of valves...
Your systemm has transient compressible flow in a network. There is no simple way to model this. There are expen$ive $y$tem$ that can model these $cenario$. Two that come to mind are AFT Arrow from Applied Flow Technology and EASY5 (developed by Boeing) available from Mechanical Dynamics...
Typically something like this would be let down in multiple (2-3) stages. You didn't state if it is liquid or gas. Liquid would almost certainly have severe cavitation, noise, vibration, and erosion damage. Gas would still have noise and vibration damage potential.
There are special valve...
Hero123,
I agree that the equation is too complex if you are doing hand calculations. But, if you are including it in a computer program or have a good scientific calculator (HP 48G, but I'm biased) with an equation solver, it is quite easy to handle.
ASTM D341 Gives the equation:
Log10(Log10(n + 0.7)) = A - B*Log10(T + 273)
Where:
n = kinematic viscosity in cSt
T = temperature in °C
Log10 = logarithm base 10
A, B = constants determined from 2 temperature-viscosity points, which are commonly 40 °C and 100 °C.
I got the previous information...
I have a situation where a 12" 304H pipe operates at ~15 PSIG and 1250 °F. Gaskets are spiral wound, 347 SS windings with composite mica/graphite/mica filler. Bolting is A193 B16. Piping is insulated with calcium silicate insulation. In areas where the flanges are not accessible (no...
Your request is completely off topic for this forum, but I'm feeling nice. The system uses another cam lobe to pull the valve shut, in addition to the standard cam lobe to open. Very light valve springs are used to help with sealing during starting. Check out the link...
Calculate the hydraulic diameter, which is D_h = 4*A/P. A is cross sectional area of the fluid in the trough. P is the wetted perimeter, which is the portion of the perimeter of the fluid that is touching the trough. Once this is done, you can calculate the Reynold's number and use friction...
To bracket the problem, the 2 cases would be an adiabatic vessel or an isothermal vessel. As before, reality will be somewhere in between.
For the adiabatic case:
T2 = T1(P2/P1)^((k-1)/k)
For the isothermal case:
T2 = T1, by definition
Use ideal gas law P*V=m*R*T to calculate mass of gas...
Assuming all tubing is uniform diameter, you will have choked flow that is sonic (Mach = 1.0) at the discharge. The mass flow rate will vary in direct proportion to the absolute pressure in the vessel. If you can convert all of your fittings into equivalent lengths of pipe, then you can model...
