Fundamental forms of correlations are proposed for large bubble lengths, liquid slug lengths and slug unit lengths, and slug periods of gas-liquid two-phase slug flow in vertical pipes. The empirical correlations for each length are derived using 337 experimental data obtained from water-air, water solution containing NaOH, K
3Fe(CN)
6 and K
4Fe(CN)
6- air and water-carbon dioxide two-phase slug flows in pipes of their diameter 8-50.8mm, and volumetric fluxes J
G=0.0256−3.42m/s, J
L=0.0390−1.50m/s, J
T=0.0847−4.40 m/s. They are shown below. For large bubble length L
LB: L
LB=0.121D(J
G/J
T)
1.70(J
L/J
T)
-0.408(J
T/(gD)
0.5)
0.582(ρ
LDJ
T/μ
L)
0.149(ρ
LDJ
T2/σ)
-0.207(μ
G/μ
L)
0.291(ρ
G/ρ
L)
-0.831+0.00186. For liquid slug length L
LS: L
LS=534000D(J
G/J
T)
0.415(J
L/J
T)
0.143(J
T/(gD)
0.5)
0.143(ρ
LDJ
T/μ
L)
0.0983(ρ
LDJ
T2/σ)
-0.119(μ
G/μ
L)
1.34(ρ
G/ρ
L)
0.753−0.124. For slug unit length L
SU: L
SU=19700D(J
G/J
T)
0.305(J
L/J
T)
-0.340(J
T/(gD)
0.5)
0.393(ρ
LDJ
T/μ
L)
0.0275(ρ
LDJ
T2/σ)
-0.154(μ
G/μ
L)
0.944(ρ
G/ρ
L)
0.346−0.291. The similar method is applied to derive the correlation for the slug period. The following correlation is obtained using 205 experimental data. T
B=16100(D/J
T)(J
G/J
T)
1.38(J
L/J
T)
-0.166(J
T(gD)
0.5)
-0.317(ρ
LDJ
T/μ
L)
1.61(ρ
LDJ
T2/σ)
-0.564(μ
G/μ
L)
0.333(ρ
G/ρ
L)
3.04+0.0870. These empirical correlations are applicable for gas-liquid two-phase slug flow under nearly room temperature and at atmospheric pressure.
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