An inclined tube manometer is used to measure the pressure drop in an elbow through which water is flowing (see Figure P4.10). The manometer fluid is an oil with $\mathrm{SG}=1.15$. The distance $L$ is the distance along the inclined tube that the interface has moved from its equilibrium (no pressure differential) position. If $h=6$ in., $L=3$ in., $\theta=30^{\circ}$, the reservoir diameter is 2 in., and the tubing diameter is 0.25 in., calculate the pressure drop $\left(P_{1}-P_{2}\right)$ in (a) atm; (b) $\mathrm{Pa}$; (c) $\mathrm{cmH}_{2} \mathrm{O}$, and; (d) dyn $/ \mathrm{cm}^{2}$. What would be the percentage error in pressure difference as read by the manometer if the change in level in the reservoir is neglected?

FIGURE P4.10

Transcribed Image Text:

1 2 L h