An orifice is a hole drilled into the bottom or side of a tank, with a closed border, used to discharge fluid. A mouthpiece is a short tube attached to the circular hole of the tank, matching its size, to allow liquid to be expelled through it. By using both an orifice and a mouthpiece, the flow of liquid can be measured. The purpose of the setup is to determine the coefficient of discharge for both the orifice and the mouthpiece. The system includes a supply tank with a universal fixture for attaching either the orifice or mouthpiece to its side. Water is supplied to the system using a centrifugal pump. A bypass valve at the pump discharge controls the head over the orifice or mouthpiece. A measuring tank is provided to measure the discharge. The X and Y coordinates of the jet coming from the orifice are measured to calculate the orifice's coefficient of discharge.

Experimental Objective

Determine the coefficients of velocity and discharge for two small orifices in the lab and compare the results with values from textbooks and other reliable references.

Specifications

·        Supply Tank: Dimensions 0.4 m × 0.3 m × 0.5 m (height).

·        Orifices: Two sizes – 8 mm and 10 mm.

·        Mouthpieces: Includes a mouthpiece with L/D ratio of 4, a mouthpiece with L/D ratio of 1, a Bordas mouthpiece, and a convergent mouthpiece.

·        Measurement: X-Y gauge for measuring orifice jet coordinates.

·        Flow Measurement: Measuring tank of suitable capacity or calibrated water flow meter.

·        Sump Tank: Adequate capacity for water storage.

·        Pump: 0.5 HP pump with control valve.

·        Documentation: Supplied with a technical manual.

Utilities required other than above supply

Flow Surface Dimensions: 2 m × 1 m × 1.5 m (height).

Power Supply: 230 V AC, 5 A, stabilized.