10.7: Nomenclature Application of the Theory on a Cutter Suction Dredge
- Page ID
- 32679
Ap,o |
Cross section suction pipe (pipe segment 0) |
m2 |
Ap,i |
Cross section pipe segment i |
m2 |
Cvs |
Spatial volumetric concentration |
- |
Cvt |
Transport/delivered volumetric concentration |
- |
d |
Particle diameter |
m |
Dp |
Pipe diameter |
m |
Dp,0 |
Pipe diameter suction pipe (pipe segment 0) |
m |
Dp,i |
Pipe diameter pipe segment i |
m |
Erhg |
Relative excess hydraulic gradient |
- |
Erhg,0 |
Relative excess hydraulic gradient suction pipe (pipe segment 0) |
- |
Erhg,i |
Relative excess hydraulic gradient pipe section i |
- |
FL |
Limit Deposit Velocity Froude number |
- |
g |
Gravitational constant (9.81) |
m/s2 |
H0,in |
Elevation of suction mouth (negative) |
m |
H0,out |
Elevation entrance of first pump/end of suction pipe (may be negative) |
m |
Hi,in |
Elevation start of pipe segment i |
m |
Hi,out |
Elevation end of pipe segment i |
m |
Hn,out |
Elevation end of the pipeline system (discharge) |
m |
Hwl |
Elevation waterline (defined as zero) |
m |
i |
Index pipe segment |
- |
il |
Hydraulic gradient liquid |
- |
l |
Index fitting |
- |
Ltot |
Total pipeline length |
m |
L0 |
Length suction pipe (pipe segment 0) |
m |
Li |
Length of pipe section i |
m |
m0 |
Number of fittings in suction pipe (pipe segment 0) |
- |
mi |
Number of fittings in pipe segment i |
- |
n |
Number of pipe segments |
- |
p |
Absolute pressure |
kPa |
pcav |
Absolute pressure to avoid cavitation |
kPa |
patm |
Atmospheric pressure (normally 100 kPa) |
kPa |
p0,in |
Absolute pressure at suction mouth (pipe segment 0) |
kPa |
p0,out |
Absolute pressure at the end of the suction pipe (pipe segment 0) |
kPa |
pe,k+1 |
Absolute pressure at entrance pump k+1 |
kPa |
pd,k+1 |
Absolute pressure at discharge pump k+1 |
kPa |
Δp |
Pressure difference |
kPa |
Δpm |
Pressure loss in pipeline |
kPa |
Δpm,0 |
Pressure loss in suction pipe (pipe segment 0) |
kPa |
Δpm,i |
Pressure loss in pipe segment i |
kPa |
Δpp,i |
Pump head pump i |
kPa |
Qgw,i |
Additional glad water flow in pump i |
m3/s |
Qm |
Mixture flow |
m3/s |
Qm,0 |
Mixture flow in suction pipe (pipe segment 0) |
m3/s |
Qm,i |
Mixture flow in pipe segment i |
|
Rsd |
Relative submerged density solids |
- |
vls |
Line speed |
m/s |
vls,ldv |
Limit Deposit Velocity (LDV) |
m/s |
vls,0 |
Line speed in suction pipe (pipe segment 0) |
m/s |
vls,i |
Line speed in pipe segment i |
m/s |
ρl |
Liquid density |
ton/m3 |
ρm |
Mixture density |
ton/m3 |
ρm,0 |
Mixture density in suction pipe (pipe segment 0) |
ton/m3 |
ρm,i |
Mixture density in pipe segment i |
ton/m3 |
λl |
Darcy Weisbach friction factor |
- |
λl,0 |
Darcy Weisbach friction factor in suction pipe (pipe segment 0) |
- |
λl,i |
Darcy Weisbach friction factor in pipe section i |
- |
θ0 |
Pipe inclination angle suction pipe (pipe segment 0) |
o |
θi |
Pipe inclination pipe segment i |
o |
ξl,0 |
Fittings factor of fitting l in suction pipe (pipe segment 0) |
- |
ξl,i |
Fittings factor of fitting l in pipe segment i |
- |
μsf |
Sliding friction factor (0.3-0.5) |
- |