IGNOU MRW 2 2026 - Define the following dimensionless numbers a) Nusselt num

Question

Define the following dimensionless numbers

a) Nusselt number

b) Peclet number

c) Prandtl number

d) Rayleigh number

e) Reynolds number

23 Apr 2026

Answer :

Word Count : 340

Dimensionless numbers are used in heat transfer and fluid flow to analyze and compare different physical situations without dependence on specific units. They represent ratios of important physical effects such as conduction, convection, inertia, and viscosity, and help in developing correlations for practical engineering problems. The Nusselt number is a measure of the enhancement of heat transfer through a fluid layer as a result of convection compared to pure conduction. It is defined as the ratio of convective to conductive heat transfer across a boundary. A higher value indicates more effective convective heat transfer. When the Nusselt number is equal to one, heat transfer occurs purely by conduction. Nu = \frac{hL}{k} The Peclet number represents the

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