Question

For pipe in part (a) and the same gauge pressure maintained by the pump, what does the volume flow rate become if the water is at a temperature of ${60}^{0}C$(the viscosity of water at ${60}^{0}C$ is 0.469 poise)

Answer 1

$Q\propto \frac{1}{\eta }$
$\therefore \frac{Q_1}{Q_2}=\frac{{\eta }_2}{{\eta }_1}$ or
$Q_2=\left(\frac{{\eta }_1}{{\eta }_2}\right)Q_1$
$=\left(\frac{1.005}{0.469}\right)(7\times {10}^{-2})$
$=0.15$ m${}^3$/s