Examveda

Nusselt number (NN) 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. $${{\text{N}}_{\text{N}}} = \frac{{{{\text{V}}^2}}}{{{\text{t}}{{\text{c}}_{\text{p}}}}}$$

Solution(By Examveda Team)

Nusselt number (NN) 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 (NN) is given by $${{\text{N}}_{\text{N}}} = \frac{{{\text{h}}l}}{{\text{k}}}$$

1. 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=hl/k

Related Questions on Refrigeration and Air Conditioning

Nusselt number (NN) 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. $${{\text{N}}_{\text{N}}} = \frac{{{{\text{V}}^2}}}{{{\text{t}}{{\text{c}}_{\text{p}}}}}$$