Difference between revisions of "Griffith correlation"
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The bubble flow exist when: | The bubble flow exist when: | ||
| − | :<math> \frac{ | + | :<math> \frac{v_g}{v_g + v_L} < L_B </math><ref name= Orkiszewski /> |
:<math> L_B = 1.071 - 0.2218 \frac{(v_g+v_L)^2}{D}</math>, with the limit <math> L_B \geqslant 0.13 </math><ref name= Orkiszewski /> | :<math> L_B = 1.071 - 0.2218 \frac{(v_g+v_L)^2}{D}</math>, with the limit <math> L_B \geqslant 0.13 </math><ref name= Orkiszewski /> | ||
Revision as of 16:53, 27 March 2017
Brief
The Griffith correlation [1] is an empirical correlation which defines:
- The boundary between the bubble and slug flow[2]
- The void fraction of gas in bubble flow - gas hold up Hg[2]
Math & Physics
The bubble flow exist when:
, with the limit 
[2]
The gas holdup:
Discussion
Nomenclature
= gas holdup factor, dimensionless
= friction factor, dimensionless
= gas-liquid ratio, scf/bbl
= total mass of oil, water and gas associated with 1 bbl of liquid flowing into and out of the flow string, lbm/bbl
= pipe diameter number number, dimensionless
= gas velocity number, dimensionless
= liquid viscosity number, dimensionless
= liquid velocity number, dimensionless
= pressure, psia
= conversion constant equal to 32.174, lbmft / lbfsec2
= total liquid production rate, bbl/d
= Reynolds number, dimensionless
= solution gas-oil ratio, scf/stb
= specific gravity, dimensionless
= temperature, °R or °K, follow the subscript
= velocity, ft/sec
= water-oil ratio, bbl/bbl
= gas compressibility factor, dimensionless
References
- ↑ Griffith, P.; Wallis, G. B. (August 1961). "Two-Phase Slug Flow"
. Journal of Heat Transfer. ASME. 83: 307–320.
- ↑ 2.0 2.1 2.2 2.3 2.4 Orkiszewski, J. (June 1967). "Predicting Two-Phase Pressure Drops in Vertical Pipe". Journal of Petroleum Technology. SPE. 19 (SPE-1546-PA).
