![]() Repeat the above procedure for various constant heads and calcite the average values of hydraulic coefficients of an orifice.Take the stopwatch and note down the time taken for the rise of water up to a certain height in the measuring tank and calculate the discharge.After recording initial coordinates, slide the vertical scale through the horizontal scale up to a certain distance and adjust the vertical scale with its hook touching the water jet and record the final coordinates (x 2, y 2).Note down the initial coordinates (x 1, y 1) at this point. Adjust the vertical scale to the position of vena-contracta such that the hook provided at the bottom of the vertical scale should touch the center of the water jet.good results in situations where frictional effects are very small. At vena-contracta, measure the diameter of jet using micrometer contraction gauge. devices such as Venturimeter, flow nozzle, orifice meter and pitot tube.After attaining constant head, now observe the water jet coming from the orifice and note the point where maximum contraction occurs which is nothing but vena-contracta.Maintain a constant head in the supply tank by adjusting the water supply valve provided.The principles of operation of an orifice are the same as for nozzles and Venturi meters since the stream lines of the flow and the basic formula are. Basically, an orifice is an obstacle placed in the path of flow in a pipe. Fill the supply tank with water and allow the water to flow through the orifice. 3.1.4 Orifice Meter An orifice meter is relatively inexpensive, easy to install, and a reliable flow measuring device. ![]() The Procedure to determine hydraulic coefficients of an orifice is as follows: ![]()
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