🧪 Gas Mixture Properties

Compute Mₘᵢₓ, Cp, μ, k for ideal‑gas mixtures of up to 10 species using Wilke & Wassilijewa mixing rules.

📝 Configuration

🧬 Species (y, MW, Cp, μ, k)
y [-] | MW [g/mol] | Cp [J/(mol·K)] | μ [μPa·s] | k [W/(m·K)]
Key:
μₘᵢₓ = Σ(yᵢμᵢ / Σⱼ yⱼφᵢⱼ)
kₘᵢₓ same form (Wassilijewa)

📊 Results

Configure species and click Compute.

📘 Methodology

Wilke Mixing Rule

μₘᵢₓ = Σᵢ yᵢμᵢ / Σⱼ yⱼφᵢⱼ where φᵢⱼ = [1+√(μᵢ/μⱼ)(Mⱼ/Mᵢ)¹ᐟ⁴]² / √(8(1+Mᵢ/Mⱼ)). Accurate to ~2% for non-polar gas mixtures.

Wassilijewa Rule

Thermal conductivity uses the same interaction parameter φᵢⱼ. kₘᵢₓ = Σᵢ yᵢkᵢ / Σⱼ yⱼAᵢⱼ. Originally proposed by Wassilijewa (1904), refined by Mason & Saxena.

Mixture Properties

Mₘᵢₓ = ΣyᵢMᵢ (molar average). Cpₘᵢₓ = ΣyᵢCpᵢ (molar). γ = Cp/(Cp−R). Density from ideal gas law at STP.