Solution Manual Heat And Mass Transfer Cengel 5th Edition Chapter 3 ✦

$Re_{D}=\frac{\rho V D}{\mu}=\frac{999.1 \times 3.5 \times 2}{1.138 \times 10^{-3}}=6.14 \times 10^{6}$

The heat transfer from the insulated pipe is given by: $Re_{D}=\frac{\rho V D}{\mu}=\frac{999

The outer radius of the insulation is:

$\dot{Q}=10 \times \pi \times 0.004 \times 2 \times (80-20)=8.377W$ $Re_{D}=\frac{\rho V D}{\mu}=\frac{999