Heat Transfer
Multipass heat exchangers are used

For low heat load
To obtain higher heat transfer co-efficient and shorter tube
To reduce the pressure drop
Because of simplicity of fabrication

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

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

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