Lockhart Martinelli

Sheet1Lockhart-Martinelli Method for Two-Phase Pressure Drophttp://excelcalculations.blogspot.com

ParametersLegendPipe roughness (m)0.0001Parameters specified by userPipe diameter (m)0.15Intermediate calculationsCross-sectional area0.0176714587Results

Liquid GasDensity (kg m-3)7102.73Viscosity (Pa s)0.0050.0000135Flowrate (kg s-1)202Mass flux (kg m-2 s-1)1131.768484209113.1768484209Reynolds number33953.0545262711257520.53801004Friction factor (Haaland Equation)0.02430112590.0181537056Pressure gradient (Pa m-1)146.137604627283.9203876045Lockhart-Martinelli factor0.71743523580.7174352358Pressure drop multiplier5.29454452733.7984928013Total pressure gradient (Pa m-1)4096.55881633764096.5588163376

Sheet2Calculating Two-Phase Pressure Drop with the Lockhart-Martinelli Correlation

The Lockhart and Martinelli correlation is commonly used to calculate the pressure-drop of two-phase flow in pipe. It's simpler than other methods, and is particularly suitable for low liquid and gas flows in small diameter pipes.

This Excel spreadsheet helps you calculate the two-phase pressure drop in a pipe. It has several stages

First the pressure drops of the individual phases are calculated assuming that each phase is alone in the pipe (i.e. separated flow).Then, the Lockhart-Martinelli parameter is calculated.

Finally, the Chisholm (1967) correlation is used to calculate the total pressure drop.

Sheet3