Mini-channel flow condensation enhancement through hydrophobicity in the presence of noncondensable gas

•Condensation at steam mass fluxes of 35–75kg/m2s and N2 mass fractions of 0–30%.•Nitrogen in hydrophilic channel reduces condensation heat transfer by 24–55%.•Dropwise condensation heat transfer enhancement in hydrophobic channel with N2.•Condensation heat transfer coefficients are a function of vapor mass fraction.