Two-Phase Flow Martinelli-Nelson Calculator

Two-Phase Core Hydraulics: Compute boiling frictional pressure drops, Lockhart-Martinelli parameter ($X_{tt}$), two-phase multipliers ($\Phi_{lo}^2$), and spatial acceleration heads.

Boiling Channel Geometry & Flow

Channel Heated Length $L$ (m):

Hydraulic Diameter $D_h$ (mm):

Mass Flux $G$ (kg/m²·s):

Operating Pressure $P$ (MPa):

Exit Steam Quality $x_{\text{exit}}$:

Liquid Darcy Friction Factor $f_{lo}$:

Pressure Drop & Two-Phase Dynamics

Total Pressure Drop ($\Delta P_{\text{tot}}$)

-- kPa

-- psi

Two-Phase Multiplier ($\bar{\Phi}_{lo}^2$)

1-Phase ΔP_lo: -- kPa

Frictional Component ($\Delta P_{\text{fric}}$)

-- kPa

-- % of total

Acceleration Component ($\Delta P_{\text{acc}}$)

-- kPa

Elevation ΔP_grav: -- kPa

Two-Phase State Breakdown:

• Lockhart-Martinelli parameter $X_{tt}$: --

• Exit cross-sectional void fraction $\alpha_{\text{exit}}$: --

• Density ratio $\rho_f / \rho_g$: --

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Two-Phase Flow Martinelli-Nelson Calculator

Boiling Channel Geometry & Flow

Pressure Drop & Two-Phase Dynamics

Frequently Asked Questions