Table 1 Thermophysical properties and oscillating twin-roll strip casting parameters of AlSi9Cu3 aluminum alloy
Parameter | Value | Parameter | Value | Parameter | Value |
|---|---|---|---|---|---|
Roller diameter l (mm) | 160 | Atmosphere temperature T (K) | 300 | Air specific C (J/kg) | 1006.43 |
Velocity v (mm/s) | 30 | Liquids temperature T (K) | 858.3 | Atmosphere pressure P (Pa) | 1.01235 × 105 |
Contact angle α (o) | 40 | Solidus temperature T (K) | 777 | Air viscosity η (Pa·s) | 1.7894 × 10−5 |
Strip thickness h (mm) | 4 | Latent heat L (J/kg) | 4.17 × 105 | Pouring temperature T (K) | 878.3 |
Frequency f (Hz) | 5, 10, 15, 20 | Metal specific heat C (J·kg−1K−1) | 970 | Amplitude a (mm) | 0.1, 0.2, 0.3, 0.4, 0.5 |
Air density ρ (kg/m) | 1.225 | Metal density ρ (kg/m3) | 2.625 × 103 | Contact resistance f (m2K/W) | 6 × 10−5 |
Heat transfer coefficient K (W/m2) | 4000‒6000 | Air gap thermal conductivity J (W·m−1K−1) | 3.9 × 10−2 | Roller emissivity | 0.5 |
Aluminum alloy emissivity | 0.4 |