The Lockhart–Martinelli parameter () is a dimensionless number used in internal two-phase flow calculations. 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 was first used by R. W. Lockhart and Raymond C. Martinelli in 1949.
It is defined as:
where
is the liquid phase mass flowrate; is the gas phase mass flowrate; is the gas density; is the liquid density.
See also
Wet gas
References