H₂O₂ / H₂O evaporation rate

Free-film evaporation of a binary H₂O₂/H₂O liquid into a humid air boundary. Pure-component vapour pressures come from Giguère and Maass (H₂O₂) and Tetens (H₂O), with non-ideality handled by a Margules model. The flux kernel is either Hertz-Knudsen, for a perfectly stirred gas, or one of three boundary-layer modes.

Calculation Mode

A · Hertz-Knudsen B · Stefan / Fick C · Wilke D_eff D · Krishna-Standart

Common Inputs

Liquid temperature T_liq

°C

Reference pressure P_ref

Air temperature T_air

°C

Initial relative humidity

H₂O₂ weight fraction

wt %

N₂ volume fraction

vol fr

N₂ Injection Method

I · Isobaric replacement (P fixed) II · Pressurisation (P rises)

Boundary Layer (modes B/C/D)

Air velocity U

m/s

Manual δ override

Manually override boundary-layer thickness δ_eff

U = 0 selects natural convection (δ_eff ≈ 5 mm fallback).

Instantaneous flux (t = 0)

H₂O₂ flux

— mol/m²·s

— g/min

H₂O flux

— mol/m²·s

— g/min

Awaiting inputs — click “Calculate t = 0”.

Dynamic simulation (0 – 3600 s)

H₂O₂ mass (g) H₂O mass (g) Total (g)

Liquid H₂O₂ wt %

Initial film: 1 mm depth × 100 cm² (≈ 11 g of 30 wt % solution). Integration: explicit RK4, 300 steps over 1 h.