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. $${{\text{N}}_{\text{N}}} = \frac{{{{\text{V}}^2}}}{{{\text{t}}{{\text{c}}_{\text{p}}}}}$$
Answer: Option A
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 $${{\text{N}}_{\text{N}}} = \frac{{{\text{h}}l}}{{\text{k}}}$$
This Question Belongs to Mechanical Engineering >> Refrigeration And Air Conditioning
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