Скачать с ютуб Flow Measurement in Open Channels |SumamMiss| FLUID MECHANICS Lecture Videos:M4 – L30 в хорошем качестве

Flow Measurement in Open Channels |SumamMiss| FLUID MECHANICS Lecture Videos:M4 – L30

In this video, we explore the critical role of flow measurement in open channels and delve into the fundamental principles underlying it. With water resources facing increasing demand and dwindling availability, accurate flow measurement is essential for effective management. Flow measurement in open channels relies on hydraulic structures of fixed geometry placed within the flow to direct it over the device. These structures, known as primary devices, establish a known relationship between the fluid level upstream of the device and the flow rate. Notch and weir are the most commonly used devices for measuring flow in open channels. A notch is a geometric opening typically made of metal plates, positioned on the side of a tank or channel to measure flow rates. Notches are classified based on their shape and the presence of end contraction, with triangular, rectangular, trapezoidal, and stepped notches being common types. Weirs, on the other hand, are structures built across rivers to raise the liquid level upstream and allow excess water to flow downstream. Weirs are classified based on various factors such as the shape of the opening, shape of the crest, and discharge conditions. Sharp crested weirs, narrow crested weirs, and broad crested weirs are examples of different weir types. The classification of weirs also takes into account the effect of sides on the issuing nappe, leading to categories like weirs with end contraction and weirs without end contraction. Understanding these classifications is crucial for accurate flow measurement, especially when accounting for end contraction effects. In subsequent videos, we will delve deeper into the equations and methodologies used for computing discharge, considering factors such as the shape of the opening, crest, and the effect of sides on the issuing nappe. Join us as we explore the intricacies of flow measurement in open channels, uncovering the principles and methodologies that underpin this essential aspect of water resource management.