railway RRB JE (CBT I + CBT II) Mock Test 2024 Heat Transfer Convection Dimensionless Numbers

The thermal diffusivity of a material is 20 × 10-6 m2/s. A cube of side 10 cm is placed in a furnace. What is the value of Fourier number after 15 s?

1
1.08
2
3.15
3
2.16
4
3.24
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