Titlebook: Analysis of Surge; John Pickford Textbook 1969Latest edition Macmillan Publishers Limited 1969 civil engineering.engineering

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https://doi.org/10.1007/1-4020-2818-0les of water in any cross-section move together and may be assumed to remain in one plane. Open channel waves may be divided into two broad categories depending on whether the vertical component of the acceleration of particles of water is negligible or not. If the vertical component is small, there

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Introduction to Waterhammer,surges of pressure which move up and down the pipe causing it to ‘knock’. This effect is sometimes noticed when a bath-tap is shut quickly and the knocking noise can occasionally be heard all over the house. ‘Waterhammer’ is the term applied to pressure surges set up in this way whether actual ‘hammering’ or knocking occurs or not.

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Elastic Theory for a Simple Pipe, in this way are reasonably accurate if the change of flow is slow and smooth. If, however, the change of flow is sudden, i.e. if . = 0, where . is the time of the valve movement, then d./d. would be infinite and the pressure increase or decrease would be infinite. Experiments show that the change of pressure is finite.

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Graphical Methods,ly a number of ‘time-saving’ graphical methods were developed. In practice these methods all take quite a long time to carry out, and they cannot compare in accuracy with numerical methods performed by computers.

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Sleep-Paralysis

Open Channel Surge, depending on whether the vertical component of the acceleration of particles of water is negligible or not. If the vertical component is small, there is said to be gradually varied unsteady flow; a large vertical component is associated with rapidly varied unsteady flow.

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