Author(s): A. J. Johnston
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Keywords: No Keywords
Abstract: Basic hydraulic parameters such as velocity, pressure and turbulence intensity can all now be measured with confidence by a variety of well tried and trusted instruments. However, the position regard-ing the measurement of turbulent shear stress in normal hydraulic laboratory conditions is not so advanced. Because this parameter is fundamental to the understanding of many hydraulic engineering problems such as the mixing and scouring processes in certain jet outfall situations, or some sediment transport interact-ions, it is important to have a reliable measuring system. Hot-film anemometry can be used to measure this parameter, but it is not an easy experimental process to facilitate and requires careful consideration of; the software capabilities of the available computer, the presence of certain hardware, and the adoption of a strict experimental operating procedure. This paper will outline the practical utilisation and associat-ed problems of using a hot-film anemometer to measure turbulent shear stresses in a conventional physical hydraulic model. Further, an illustration of the use of the system to provide some understanding of a par-ticular prob1em involving a water jet impinging on a bed boundary is given.
Year: 1985