Reynolds Apparatus

The apparatus consists of a glass tube with one end having bell mouth entrance, connected to a constant head water tank, at the other end a valve is provided to vary the flow rate. The tank is of sufficient capacity to store water. A capillary tube is introduced centrally in the bell mouth for feeding dye from a small container placed at the top of tank, through polythene tubing. By varying the rate of flow, the Reynold’s number is changed. This also changed the type of flow. Visual observation of dye (Thread) will indicate the type of flow, which can be confirmed from the Reynold’s number computed.