• The solution to Newton's GEXACT VALUE & FORMULA
  • The pressure at the centre of a massTHE MATHEMATICAL LAW (calculator)
  • The pressure at the centre of a massEARTH'S INTERNAL STRUCTURE (calculator)
  • Proof of the non-exitence of Dark MatterDOES NOT EXIST
  • The atom as Newton and Coulomb describe itNO NEED FOR A UNIFICATION THEORY
The solution to Newton's G1 The theory controlling planetary spin2 Pressure at the centre of the Earth3 Proof of the non-exitence of Dark Matter4 The atom as Newton describes it5
access to the technical calculator
Q & A General 2ᴺᴰ Moment of Area 2ᴺᴰ Moment of Area+ Added Mass & Drag Areas & Volumes Balancing (rotary) Beam Strength Beam Strength+ Bearings (low friction) Bearings (plain) Bending Moments BiMetallic Strip Buoyancy Carbon Steel Catenary Catenary+ Cathodic Protection Centrifugal Force Colebrook & Fanning Column Buckling Combined Stress Co-ordinates Copper Alloys Core Pressure Electrical Current Elliptical Curves Engineering Basics Explosions Fans Fatigue Flange Gaskets Flanges Floors Fluid Forces Fluid Numbers Friction Galvanic Corrosion Gears Hardness Conversion HPHT Flexible Pipe Lift Rigging Logs & Trig Machining Tolerances Metal Properties Mode Shapes Mode 14 Newton's Laws of Motion Ocean Waves Optical Lenses Padeyes Partial Pressures Piling Pipe Flow Pipe Flow+ Pipe Strength Planetary Spin Plastic Stress in Beams Plate Deflection Pressure Vessels Reel Capacity Resolution of Forces Screw Thread Machining Screw Threads Shafts Shock Loads Spring Coefficients Spring Strength Steel Beam Sizes Stress Concentration Table of the Elements Thermal Conductivity Trigonometry UniQon Upheaval Buckling Velocity & Acceleleration Vessel Motions Vessel RAOs Vibration Damping Vortex Shedding Walls, Barriers & Tanks Weight Lifting Welding Wire Rope

Q&A forum: Pipe Flow Calculator
(gas and liquid)

All relevant questions concerning this program will be posted here along with our answers for everyone to view.
Please forward your questions to info@calqlata.com or visit our Contact Us page.

This is a very simple example about which I have a few queries:

A nylon pipe (spigot) internal dia 7mm, 8cm long - 2.820 KPa static pressure - venting to ambient.
The output flow is calculated as 3.95m/s, which is very low in contrast to measurements.
Also the volume emitted is 3.95 * 0.0000385=0.000152 m3/s, which is also very low.
The input data is below and attached.
Could you please have a quick look to see whether I have made any errors in the input parameters?

ϵ: surface roughness nylon spigot =0.0015mm=0.0000015m length 8 cm
1. ρ,1.22 -density- makes no difference to output velocity whatever value ?
2. RAM, of air 28.9644 g/mole - shouldn't this be Kg/mole ?
3. Actual flow is roughly 5-10 times as much as the calculator shows.
4. Why is there not a simple m/s flow rate in the output figures?

1. Density isn't used in the Gas calculation. It calculates the inlet density and the outlet density. This is a coding error - it shouldn't be asking for density for the gas calculation because it doesn't use it.

2. Yes it should

3. If you enter the RAM value of 0.0289644, the maximum outlet flow velocity will be about 122. Any other differences in the output velocity will be due to the input values used. RAM, viscosity, pressures, etc.

4. There is. It is the maximum outlet velocity (v̌₂), but only if your input data is in metres [/s]

In other words, PipeFlow's calculations are correct if you do the following:
A) Ignore the input data value for density in the 'Gas' calculation option
and
B) Enter RAM in kg/mol when using metric units with Newtons and kg

The calculator has since been modified to remove the requirement for density in the gas calculation

(No relevant questions have been issued for this program to date)

CalQlata™ Copyright ©2011-2018 CalQlata info@calqlata.com Site Map Terms of website use Our Store