cup type and screw type or propeller type current meter for velocity in open channel | hydraulics скачать в хорошем качестве

cup type and screw type or propeller type current meter for velocity in open channel | hydraulics

hello friend in this video we talk about devices for measuring velocity in open channel as cup type current meter and screw type current meter 0:00 introduction 3:00 cup type current meter 6:00 screw type or propeller type current meter Civil मंत्रा https://t.me/civilmantraa Ask your Question- https://forms.gle/a9dNJoxdBRkEj4iL8 "Current meter" A current meter is an instrument used to measure the velocity of flow at a required point in the flowing stream. In general it consists of a wheel or revolving element containing blades or cups, and a tail on which flat vanes or fins are fixed. The current meters, according to the shape of the revolving element, may be classified as follows: 1-Cup type 2-Screw type or propeller type "cup type" In a Cup type current meter (Fig. 16.41) the wheel or revolving element has the form of a series of conical cups, mounted on a spindle. The spindle is held vertical at right angle to the direction of flow. "screw type or propeller type" In a screw or propeller type current meter (Fig. 16.42) the revolving element consists of a shaft, with its axis parallel to the direction of flow, which carries a number of curved vanes (or propeller blades) mounted on the periphery of the shaft. This type of meter is more sensitive than cup type because it gives higher r.p.m. for the same velocity of flow. how to measure In order to measure the velocity of flow, meter is submerged under water and motion of water in the stream activates it, driving the wheel (or rotatory elements) at a speed proportional to the velocity of flow. An electric current is passed from the battery to the wheel by means of wire. The rotation of wheel makes and breaks the electric circuit, which causes an electric bell to ring. Thus by counting the ringing of bell, the rotations of the wheel and hence the velocity of flowing water is obtained.