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

$\dot{Q}=h \pi D L(T_{s}-T_{\infty})$

$\dot{Q} {cond}=\dot{m} {air}c_{p,air}(T_{air}-T_{skin})$

Solution:

Solution:

The Nusselt number can be calculated by:

$\dot{Q}_{rad}=1 \times 5.67 \times 10^{-8} \times 1.5 \times (305^{4}-293^{4})=41.9W$

$\dot{Q}=\frac{423-293}{\frac{1}{2\pi \times 0.1 \times 5}ln(\frac{0.06}{0.04})}=19.1W$

$\dot{Q}_{cond}=0.0006 \times 1005 \times (20-32)=-1.806W$