{"id":2340,"date":"2020-04-02T07:49:19","date_gmt":"2020-04-02T07:49:19","guid":{"rendered":"https:\/\/seismicconsolidation.com\/?p=2340"},"modified":"2020-04-02T07:49:19","modified_gmt":"2020-04-02T07:49:19","slug":"to-study-flow-characteristics-through-venturi-flume","status":"publish","type":"post","link":"https:\/\/seismicconsolidation.com\/to-study-flow-characteristics-through-venturi-flume\/","title":{"rendered":"To study flow characteristics through venturi flume"},"content":{"rendered":"

<\/a>To study flow characteristics through venturi flume<\/h1>\n

<\/a>Objectives:<\/h2>\n
    \n
  1. To draw water surface profiles of flow through venturi flume<\/li>\n
  2. To study relationship between upstream discharge and depth<\/li>\n
  3. To study relationship between upstream discharge and depth at throat<\/li>\n
  4. To determine coefficient of discharge of venturi flume<\/li>\n<\/ol>\n

    <\/a>Apparatus:<\/h2>\n
      \n
    1. S6 tilting flume<\/li>\n
    2. Point gauge<\/li>\n
    3. Venturi flume<\/li>\n<\/ol>\n

      <\/a>Related theory:<\/h2>\n

      <\/a>Venturi flume:<\/h3>\n

      \u201cIt is an instrument used to measure the discharge of liquid flowing in open channels\u201d<\/p>\n

      A\u00a0venturi flume\u00a0is a critical-flow open\u00a0flume\u00a0with a constricted flow which causes a drop in the hydraulic grade line, creating a critical depth.<\/p>\n

      It is used in\u00a0flow measurement\u00a0of very large flow rates, usually given in millions of cubic units.<\/p>\n

      Measurement of\u00a0discharge\u00a0with venturi flumes requires two measurements, one upstream and one at the throat (narrowest cross-section), if the flow passes in a subcritical state through the flume.\u00a0If the flumes are designed so as to pass the flow from sub critical to supercritical state while passing through the flume, a single measurement at the throat (which in this case becomes a critical section) is sufficient for computation of discharge. To ensure the occurrence of critical depth at the throat, the flumes are usually designed in such way as to form a\u00a0hydraulic jump\u00a0on the downstream side of the structure. These flumes are called ‘standing wave flumes’<\/p>\n

      <\/a>Difference between venturi meter and venturi flume:<\/h3>\n

      A venturi meter is used to measure discharge in pipes while venturi flume is used to measure discharge in open channels.<\/p>\n

      A venturi meter would normally measure in millimetres, whereas a venturi flume measures in metres.<\/p>\n

      \"\"<\/p>\n

      Venturi Flume\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Venturi meter<\/p>\n

      <\/a>Parts of venturi flume:<\/h3>\n
        \n
      1. Converging portion<\/li>\n
      2. Throat<\/li>\n
      3. Diverging portion<\/li>\n<\/ol>\n

        The length of divergent cone is made longer than that of converging cone in order to avoid tendency of breaking away the stream of liquid and to minimize frictional losses.<\/p>\n