Lockhart–Martinelli parameter

The Lockhart–Martinelli parameter ( $\chi$ ) is a dimensionless number used in internal two-phase flow calculations.^[1] It expresses the liquid fraction of a flowing fluid. Its main application is in two-phase pressure drop and boiling/condensing heat transfer calculations.

It is defined as:

\chi = \frac{m_\ell}{m_g} \sqrt{\frac{\rho_g}{\rho_\ell}},

where

$m_\ell$ is the liquid phase mass flowrate;

$m_g$ is the gas phase mass flowrate;

$\rho_g$ is the gas density;

$\rho_\ell$ is the liquid density.

References

↑ Lockhart, R.W., Martinelli, R.C.; Chem. Eng. Prog., Vol. 45. 1949, pp. 39–48

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Lockhart–Martinelli parameter

See also

References