Measurement of hydraulic coefficients using a Mariotte bottle and a smartphone

The Mariotte bottle is a device that delivers a constant flow rate as a result of the constant pressure inside the bottle. This bottle has also been used to study Torricelli’s law, the transition of laminar and turbulent flow, and the capillary interruption of a liquid jet. In fluid mechanics, orifice hydraulic coefficients are essential prerequisites for determining the actual flow of fluid through the orifice. As is well known, when determining the discharge and velocity coefficients of a fluid emitted from a cylinder, maintaining a constant head by continuously supplying the fluid according to the flow rate is difficult.