Discussion
Match List - I and List II :
| List - I | List - II |
|---|---|
| (a) Stanton number | (i) natural convection |
| (b) Grashof number | (ii) mass transfer |
| (c) Peclet number | (iii) forced convection |
| (d) Schmidt number | (iv) forced convection for small Prandtl number fluids |
Choose the most appropriate answer from the options given below :
Answer: C
The correct matching is (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii).
- Stanton number, \(St = Nu/(Re\,Pr)\), is used in forced convection (a-iii).
- Grashof number, buoyancy over viscous force, governs natural convection (b-i).
- Peclet number, \(Pe = Re\,Pr\), is used in forced convection where Pr is small, as in liquid metals (c-iv).
- Schmidt number, momentum diffusivity over mass diffusivity, belongs to mass transfer (d-ii).
Two pairs are enough: Grashof with natural convection and Schmidt with mass transfer appear together only in this option. The options starting (a)-(ii) give Stanton to mass transfer, which is wrong.
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