GATE MT 2013 Q47. Ladle deoxidation of liquid steel is done at 1600°C by adding ferro-aluminium. By assuming Stokes law behaviour, time (in s) required for alumina particles of 50 μm diameter to float to the surface from a depth of 2 m would be__________ [Given: density of steel = 7000 kg/m3 , density of alumina = 3650 kg/m3 , viscosity of steel =6×10-3 kg/m/s]
GATE MT 2013 Q47. Ladle deoxidation of liquid steel is done at 1600°C by adding ferro-aluminium. By assuming Stokes law behaviour, time (in s) required for alumina particles of 50 μm diameter to float to the surface from a depth of 2 m would be__________ [Given: density of steel = 7000 kg/m3 , density of alumina = 3650 kg/m3 , viscosity of steel =6×10-3 kg/m/s]
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Correct answer is in the range of 2626 to 2632. ν= 2/9 (gR2(ρs- ρl) /η t= h/ν ν= (2/9 )×9.8 ×(25×10-6)2 (7000-3650)/ (6×10-3) t= 2/ν = 2629 seconds.
Correct answer is in the range of 2626 to 2632.
ν= 2/9 (gR2(ρs– ρl) /η
t= h/ν
ν= (2/9 )×9.8 ×(25×10-6)2 (7000-3650)/ (6×10-3)
t= 2/ν = 2629 seconds.
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