Heat Transfer
If Prandtl number is greater than the Schmidt number, then the

thermal boundary layer lies inside the concentration boundary layer
none of the listed here
thermal & concentration boundary layers are of equal thickness
concentration boundary layer lies inside the thermal boundary layer

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Heat Transfer
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

By direct contact of hot flue gas with air
None of these
By heating an intermediate material (like chequor bricks) and then heating the air from this hot material
Through a metallic wall

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