Supriya Ghosh (Editor)

Lockhart–Martinelli parameter

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The Lockhart–Martinelli parameter ( χ ) 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 is defined as:

χ = m ℓ m g ρ g ρ ℓ ,

where

  • m ℓ is the liquid phase mass flowrate;
  • m g is the gas phase mass flowrate;
  • ρ g is the gas density;
  • ρ ℓ is the liquid density.

    • References

    Lockhart–Martinelli parameter Wikipedia
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