Difference between revisions of "Griffith correlation"

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Revision as of 16:40, 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:

\frac{q_g}{q_g + q_L} < L_B [2]
L_B = 1.071 - 0.2218 \frac{(v_g+v_L)^2}{D}, with the limit L_B \geqslant 0.13 [2]

The gas holdup:

H_g = \frac{1}{2}\ \left ( 1 + \frac{v_g+v_L}{v_s} - \sqrt{ \left ( 1 + \frac{v_g+v_L}{v_s} \right )^2 - 4 \frac{v_g}{v_s}} \right ) [2]

Discussion

Nomenclature

References

  1. ↑ Griffith, P.; Wallis, G. B. (August 1961). "Two-Phase Slug Flow". Journal of Heat Transfer. ASME. 83: 307–320. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Orkiszewski, J. (June 1967). "Predicting Two-Phase Pressure Drops in Vertical Pipe"Paid subscription required. Journal of Petroleum Technology. SPE. 19 (SPE-1546-PA). 
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