Sri Ramakrishna Mission Vidyalaya Polytechnic College, Coimbatore - 641 020

   NOTCH ,WEIR AND ITS TYPES Notch A  notch  may be defined as an obstruction over which the flow of liquid occurs   In case of measuring tank or reservoir, the opening is provided at the side of the tank such that the liquid surface in the tank is below the top edge of the opening. Weir A  weir  is a notch on a large scale used for measuring the flow of a river, canal etc. It is a concrete or masonry structure of substantial breadth built across the river in the direction of flow. This allows the excess water to flow over its entire length to the downstream side. Thus a weir is similar to a small dam constructed across the river, with a difference that the excess water flows downstream only through a small portion called  spillway  and in case of weir, the excess water flows over its entire length. Nappe and crest The sheet of water flowing through a notch or over a weir is known as  nappe  or  vein . The bott...

  What is an Orifice Meter? The orifice meter is a type of flow meter used to measure the flow rate of fluids (liquids or gases) based on the principle of differential  pressure  measurement.    Construction of Orifice Meter Inlet Section:  The fluid from one end of the pipe enters through this section. The diameter of the section depends on the flow to be measured. Orifice Plate:  A device used for measuring flow rate, lowering pressure, or restricting flow is called an orifice plate . These plates are usually thin with holes that are installed in pipes. U-Tube Manometer:  A manometer monitors the pressure of fluids. A U-tube column filled with mercury serves as the pressure reading display in a U-tube manometer. One end of it is installed before the orifice plate and the other end is installed after it. Outlet Section : This is the section w...

Venturi meters are instruments for fluid flow   measurement. It has a converging section that gives an increase in the flow velocity with a corresponding drop in pressure from which the flow rate can be calculated.  The reduction in the fluid pressure that occurs when a fluid moves through a constricted passage is known as the Venturi effect.  Venturi meters are widely used wherever there is a need for fluid flow measurement, specifically in water, chemical, and oil industries.  Depending on the application and size requirements, industrial venturi meters are constructed in various forms.  These versatile instruments are known for longevity, long performance, and reliability. In this article, we will discuss about the following: Definition of Venturimeter Venturimeter Diagram and Parts Working Principle of Venturi meter Co-efficient of Discharge for Venturimeter. What is a Venturimeter? Venturimeter Definition Venturimeter is a  type of flowmeter  that...