Example -7.8-

A (30cm x 15cm) Venturi meter is provided in a vertical pipe-line carrying oil of sp.gr. = 0.9. The flow being upwards and the difference in elevations of throat section and entrance section of the venture meter is 30 cm. The differential U-tube mercury manometer shows a gauge deflection of 25 cm. Take Cd = 0.98 and calculate: -

i- The discharge of oil

ii- The pressure difference between the entrance and throat sections.

Drive an equation of discharge through Vertical Venturi meter and resolve example -7.8- by this equation, and estimate the percentage error with using horizontal

meter equation.