Nusselt number (N_N) is given by

A) $${{\text{N}}_{\text{N}}} = \frac{{{\text{h}}l}}{{\text{k}}}$$ B) $${{\text{N}}_{\text{N}}} = \frac{{\mu {{\text{c}}_{\text{p}}}}}{{\text{k}}}$$ C) $${{\text{N}}_{\text{N}}} = \frac{{\rho {\text{V}}l}}{\mu }$$ D) $${{\text{N}}_{\text{N}}} = \frac{{{{\text{V}}^2}}}{{{\text{t}}{{\text{c}}_{\text{p}}}}}$$

Answer & Solution

Correct Answer: Option A

Nusselt number (N_N) is the ratio of convective to conductive heat transfer at a boundary in a fluid.
A Nusselt number of value one represents heat transfer by pure conduction.
Nusselt number (N_N) is given by $${{\text{N}}_{\text{N}}} = \frac{{{\text{h}}l}}{{\text{k}}}$$

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Jagaveerapandiyan Jvp 8 years ago

nusselt number is nondimensional number at a boundary surface mathematically is given by convection/ conduction heat transfer across the boundary. where Qconv= hAdt Qcond=kAdt/l
Nu=Qconv/Qcond
Nu=hAdt/kAdt/l
Nu=hl/k

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Nusselt number (NN) is given by

Nusselt number (NN) is given by

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