The figure shows an ejector (or jet pump) which extracts 2 x 103 m3/s of water from tank A which is situated 2.0 m below the centre-line of B the ejector. The diameter of the outer pipe of the ejector is 40 mm and water is supplied from a reservoir to the thin-walled inner pipe which is of diameter 20 mm. The ejector discharges to atmosphere at section C. Evaluate the pressure p at section D, just downstream of the end of pipe B, the velocity in pipe B and the required height of the free water level in the reservoir supplying pipe B. (-21.8 kPa gauge, 12.9 m/s, 6.3 m). It may be assumed that both supply pipes are loss free. L D It may be assumed that both supply pipes are loss free. AB = x 0.02/4= 314.2 x 106 m ADAC - AB=942.48 x 106 m Ac = x 0.04/4 = 1256 x 106 m Up = QD/AD=0.002 x 10/0.94248 x 10 = 2.122 m/s ==