3 Hydrodynamics
181
Fig. 3.7 Jean-Charles de Borda(1733–1799, French physicist)
the liquid must be considered when studying the friction resistance of the
channel or pipe wall.
3.2.3 Cavitation and Cavitation Erosion
When the liquid flows through an area with low enough pressure, it will
vaporize and form a cavity inside the liquid or at the liquid-solid interface
(as shown in Fig. 3.8). Water often contains bubbles (called gas cores) with
diameters ranging from tens to hundreds of microns. Cavitation occurs only
when there are gas cores. The collapse of the cavity produces impact, which
causes erosion and destruction of sidewall materials.
3.2.4 Multiphase Flow
A liquid flow with solid particles, bubbles or both is called multiphase flow
(as shown in Fig. 3.9). The most common flow is the sediment laden flow
(sediment movement), followed by the aerated flow and cavitating liquid flow
(cavitation flow theory). The gas nuclear energy affects the propagation of
181
Fig. 3.7 Jean-Charles de Borda(1733–1799, French physicist)
the liquid must be considered when studying the friction resistance of the
channel or pipe wall.
3.2.3 Cavitation and Cavitation Erosion
When the liquid flows through an area with low enough pressure, it will
vaporize and form a cavity inside the liquid or at the liquid-solid interface
(as shown in Fig. 3.8). Water often contains bubbles (called gas cores) with
diameters ranging from tens to hundreds of microns. Cavitation occurs only
when there are gas cores. The collapse of the cavity produces impact, which
causes erosion and destruction of sidewall materials.
3.2.4 Multiphase Flow
A liquid flow with solid particles, bubbles or both is called multiphase flow
(as shown in Fig. 3.9). The most common flow is the sediment laden flow
(sediment movement), followed by the aerated flow and cavitating liquid flow
(cavitation flow theory). The gas nuclear energy affects the propagation of