Water flows from a large tank as shown in Fig. P3.90. Atmospheric pressure is (14.5 mathrm{psia}), and

Question:

Water flows from a large tank as shown in Fig. P3.90. Atmospheric pressure is $14.5 \mathrm{psia}$, and the vapor pressure is 1.60 psia. If viscous effects are neglected, at what height, $h$, will cavitation begin? To avoid cavitation, should the value of $D_{1}$ be increased or decreased? To avoid cavitation, should the value of $D_{2}$ be increased or decreased? Explain.

Figure P3.90